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Reading measured value block
Vehicles from Model Year 1997
List of available group numbers
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Display group no.
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Display zone
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Designation
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Details on Page
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001
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1
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Current compressor shut-off criteria
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01-110
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2
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Supply voltage for the magnetic clutch -N25 in V
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3
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Voltage, terminal "15" in V
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4
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Signal for "ignition off time" (standing time) in minutes
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002
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1... 4
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Temperature flap positioning motor -V68
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01-117
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003
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1... 4
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Central flap positioning motor -V70
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01-119
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004
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1... 4
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Footwell/defroster flap positioning motor -V85:
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01-121
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005
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1... 4
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Air-flow flap positioning motor -V71
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01-123
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Display group no.
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Display zone
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Designation
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Details on Page
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006
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1
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Calculated ambient temperature (for ambient temperature display -G106)
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01-126
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2
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Fresh air intake duct temperature sensor -G89
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3
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Ambient temperature sensor -G17
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4
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Sunlight penetration photosensor -G107
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007
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1
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Centre vent temperature sensor -G191
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01-128
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2
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Footwell vent temperature sensor -G192
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3
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Dash panel temperature sensor -G56
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4
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Coolant temperature
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008
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1
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Specified voltage at fresh-air blower -V2
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01-130
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2
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Actual voltage at fresh-air blower -V2
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3
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Voltage at terminal "58d"
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4
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Not used (with an operating and display unit with two displays)
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Voltage at terminal "58s"(with an operating and display unit with one display)
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Display group no.
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Display zone
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Designation
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Details on Page
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009
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1
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Engine speed
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01-132
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2
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Vehicle speed
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3
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Auxiliary heater (with an operating and display unit with two displays)
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Terminal 58 (with an operating and display unit with one display)
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4
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Not used (with an operating and display unit with two displays)
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Auxiliary heater (with an operating and display unit with one display)
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010
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1
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Temperature switch for coolant "too hot"
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01-134
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2
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Air conditioner compressor cut-in
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3
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Air conditioner pressure switch -F129
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4
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Not used (with an operating and display unit with two displays)
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Heated rear window (with an operating and display unit with one display)
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Display group no.
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Display zone
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Designation
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Details on Page
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011
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1...4
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The last four compressor shut-off criteria which were effective for longer than 20 seconds.
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01-137
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012
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1
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Increase in idle speed
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01-137
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2
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Actuation of the radiator fan -V7 speed 1
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3
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Ignition key assignment
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4
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Display zone not used.
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Note:
The display groups "011" and "012" are only present on operating and display units with the Part Number 8D0 820 043 from index "M" (version with one display).
Display group 001:
Current valid compressor shutoff criteria, voltage at the magnetic clutch, voltage at terminal "15" and signal for "ignition off period"
Notes:
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◆ If one of the compressor shutoff criteria 1, 8, 11 or 12 exists, the magnetic clutch -N25 cannot be actuated during the final control diagnosis () .
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◆ If the compressor shutoff criterion "5" appears in addition to another compressor shutoff condition, ignore shutoff criterion "5".
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◆ If several compressor shutoff conditions exist simultaneously (display zone 1), the display will either show them all alternately or it will show only the shutoff condition which is assigned the highest priority by the operating and display unit -E87.
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◆ If the magnetic clutch pressure switch -F129 is open, the compressor shutoff criterion "1" (overpressure) appears first and the compressor is switched off. If the magnetic clutch pressure switch -F129 remains open for more than 30 s, there is a change to compressor shutoff criterion "3" (vacuum, refrigerant circuit empty).
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◆ Display zone 1 shows the current compressor shutoff criteria.
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◆ In vehicles with an operating and display unit with one display and the Part Number 8D0 820 043 from index "M", the last four compressor shutoff criteria which were effective for longer than 20 seconds are shown in display group 011.
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Display zone
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Meaning
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Cause of fault/fault remedy
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Code
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Compressor shutoff criteria
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1
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0
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Compressor on
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No compressor shutoff criterion detected
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- If the compressor is not switched on, perform the final control diagnosis onwards
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1
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Compressor off
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Pressure switch -F129 (between contacts 1 and 2) open
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- Open circuit or loose contact in the wiring between -F129 and -E87
Fault remedy => Fault table, Page 01-140 onwards
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2
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Display zone not used.
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3
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Compressor off
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(cont.)
t
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Pressure switch -F129 (between contacts 2 and 1) open
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- Pressure in refrigerant circuit too low (refrigerant circuit empty)
- Open circuit or loose contact in the wiring between -F129 and -E87
Fault remedy => Fault table, Page 01-140 onwards
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Display zone
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Meaning
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Cause of fault/fault remedy
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Code
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Compressor shutoff criteria
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1
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7
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Compressor off
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Air conditioner switched off by the "-"-button for fresh-air blower on the operating and display unit -E87
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- Switch the air conditioner on
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8
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Compressor off
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Measured ambient temperature lower than 2 °C
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- Ambient temperature lower than 2 °C
Place the vehicle in a heated room for the test
- Ambient temperature sensor -G17 or fresh air intake duct temperature sensor -G89 supply incorrect values
Check the ambient temperature sensor -G17 and the fresh air intake duct temperature sensor -G89 => Display group 014, Page 01-128
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9
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Display zone not used.
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(cont.)
t
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10
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Supply voltage to the operating and display unit -E87 less than 9.5 V
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- => Display zone 3 and fault table, Page 01-18
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Display zone
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Meaning
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Cause of fault/fault remedy
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Code
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Compressor shutoff criteria
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1
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13
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Compressor off
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Compressor cut-in delay (approx. 10 seconds) at engine speeds above 6000 rpm
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Of no significance for customer service
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14
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Compressor off
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Pressure switch -F129 switched off 30 times during the current driving period
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- Loose contact in the wiring between the pressure switch -F129 and operating and display unit-E87
- Fault at switch -F129 or in the refrigerant circuit
=> Fault table, Page 01-173.
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Display zone
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Meaning
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Explanatory Notes
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2
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Supply voltage for the magnetic clutch -N25 in V
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- Greater than 9.5 V, when magnetic clutch -N25 is switched on
=> Display zone 1, code 10 and Fault table, Page 01-18
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3
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Voltage, terminal 15 in V
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Connector D, contact 9 to the operating and display unit -E87
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4
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Signal for "ignition off time" (standing time) in minutes
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- Time between the last switching off and switching on of the ignition
- Display value 0 - 240
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Note on display zone 3:
If the display value with the engine running is less than 12 V, check the positive or earth connection of operating and display unit -E87:
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
Note on display zone 4:
If, when the ignition is switched on, no signal for "ignition off time" was recognised by the -E87 (sent by the dash panel insert), the -E87 assumes a standing time of more than 4 hours and it is assumed that the engine temperature is the same as the ambient temperature. Possible consequences:
- When the engine is warm, there may be a delay before the fresh-air blower starts, even though the engine is at operating temperature.
- The ambient temperature display -G106 in the dash panel insert may display incorrect ambient temperature values.
Display group 002: Temperature flap positioning motor -V68
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Display zone
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Meaning
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Explanatory Notes
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1
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Actual feedback value of potentiometer -G92 (in the positioning motor -V68)
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▪ Display value greater than 5 and less than 240
▪ Maximum permissible deviation 3 units from the specified feedback value (in the range greater than 50 but less than 180)
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2
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Specified feedback value for potentiometer -G92 (calculated by -E87)
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▪ Display range 5 - 240
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3
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Operating and display unit up to index "L" and from index "R"
-G92 value determined during the "basic setting" and stored in the -E87 with positioning motor in the setting "Heating stop" (the temperature flap guides the air flow through the heat exchanger)
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▪ Display value greater than 5 and less than 50
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Operating and display unit with index "M", "N", "P" or "Q"
-G92 value determined during the "basic setting" and stored in the -E87 with positioning motor in the setting "Cooling stop" (the temperature flap guides the air flow past the heat exchanger)
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▪ Display value greater than 180 and less than 240
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Display zone
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Meaning
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Explanatory Notes
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4
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Operating and display unit up to index "L" and from index "R"
-G92 value determined during the "basic setting" and stored in the -E87 with positioning motor in the setting "Cooling stop" (the temperature flap guides the air flow past the heat exchanger)
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▪ Display value greater than 180 and less than 240
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Operating and display unit with index "M", "N", "P" or "Q"
-G92 value determined during the "basic setting" and stored in the -E87 with positioning motor in the setting "Heating stop" (the temperature flap guides the air flow through the heat exchanger)
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▪ Display value greater than 5 and less than 50
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Notes:
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◆ If the feedback value in display zone 1 is less than 5 (short circuit) or greater than 240 (open circuit),perform electrical test => Page 01-140 onwards.
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◆ The actual feedback value (between 5 and 50 and between 180 and 240) is specified as the permitted tolerance range for the positioning motor stop or the flap in the operating and display unit -E87.
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◆ If the display values in display zones 3 or 4 are ambient the permitted range =>Fault table, Page 01-18.
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◆ With operating and display units -E87 with Part No. 8D0 820 043 and index "M","N", "P" or "Q" the display in zones 3 and 4 is swapped over.
Display group 003: Central flap positioning motor -V70
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Display zone
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Meaning
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Explanatory Notes
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1
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Actual feedback value for potentiometer -G112 (in the positioning motor -V70)
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▪ Display value greater than 25 and less than 250
▪ Maximum permissible deviation 3 units from the specified feedback value (only in the range greater than 75 but less than 200)
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2
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Specified feedback value for potentiometer -G112 (calculated by -E87)
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▪ Display range 25 - 250
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3
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Operating and display unit up to index "L" and from index "R"
-G112 value determined during the "basic setting" and stored in the -E87 with the positioning motor in the setting "Lower stop" (the temperature flap guides the air flow to the footwell/defroster flap)
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▪ Display value greater than 25 and less than 75
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Operating and display unit with index "M", "N", "P" or "Q"
-G112 value determined during the "basic setting" and stored in the -E87 with the positioning motor in the setting "Upper Stop" (the temperature flap guides the air flow to the dash panel vents)
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▪ Display value greater than 200 and less than 250
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Display zone
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Meaning
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Explanatory Notes
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4
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Operating and display unit up to index "L" and from index "R"
-G112 value determined during the "basic setting" and stored in the -E87 with the positioning motor in the setting "Upper Stop" (the temperature flap guides the air flow to the dash panel vents)
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▪ Display value greater than 200 and less than 250
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Operating and display unit with index "M", "N", "P" or "Q"
-G112 value determined during the "basic setting" and stored in the -E87 with the positioning motor in the setting "Lower stop" (the temperature flap guides the air flow to the footwell/defroster flap)
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▪ Display value greater than 25 and less than 75
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Notes:
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◆ If the feedback value in display zone 1 is less than 25 (short circuit) or greater than 250 (open circuit),perform electrical test => Page 01-140 onwards.
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◆ The actual feedback value (between 25 and 75 and between 200 and 250) is specified as the permitted tolerance range for the positioning motor stop or the flap in the operating and display unit -E87.
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◆ If the display values in display zones 3 or 4 are ambient the permitted range =>Fault table, Page 01-18.
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◆ With operating and display units -E87 with Part No. 8D0 820 043 and index "M","N", "P" or "Q" the display in zones 3 and 4 is swapped over.
Display group 004: Footwell/defroster flap positioning motor -V85:
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Display zone
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Meaning
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Explanatory Notes
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1
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Actual feedback value for potentiometer -G114 (in the positioning motor -V85)
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▪ Display value greater than 25 and less than 250
▪ Maximum permissible deviation 3 units from the specified feedback value (only in the range greater than 75 but less than 200)
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2
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Specified feedback value for potentiometer -G114 (calculated by -E87)
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▪ Display range 25 - 250
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3
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Operating and display unit up to index "L" and from index "R"
-G114 value determined during the "basic setting" and stored in the -E87 with the positioning motor in the setting "Lower stop" (the footwell/defroster flap guides the air flow to the dash panel defroster vents)
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▪ Display value greater than 25 and less than 75
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Operating and display unit with index "M", "N", "P" or "Q"
-G114 value determined during the "basic setting" and stored in the -E87 with the positioning motor in the setting "Upper stop" (the footwell/defroster flap guides the air flow to the vents in the footwell)
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▪ Display value greater than 200 and less than 250
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Display zone
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Meaning
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Explanatory Notes
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4
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Operating and display unit up to index "L" and from index "R"
-G114 value determined during the "basic setting" and stored in the -E87 with the positioning motor in the setting "Upper stop" (the footwell/defroster flap guides the air flow to the vents in the footwell)
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▪ Display value greater than 200 and less than 250
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Operating and display unit with index "M", "N", "P" or "Q"
-G114 value determined during the "basic setting" and stored in the -E87 with the positioning motor in the setting "Lower stop" (the footwell/defroster flap guides the air flow to the dash panel defroster vents)
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▪ Display value greater than 25 and less than 75
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Notes:
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◆ If the feedback value in display zone 1 is less than 25 (short circuit) or greater than 250 (open circuit),perform electrical test => Page 01-140 onwards.
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◆ The actual feedback value (between 25 and 75 and between 200 and 250) is specified as the permitted tolerance range for the positioning motor stop or the flap in the operating and display unit -E87.
-
◆ If the display values in display zones 3 or 4 are ambient the permitted range =>Fault table, Page 01-18.
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◆ With operating and display units -E87 with Part No. 8D0 820 043 and index "M","N", "P" or "Q" the display in zones 3 and 4 is swapped over.
Display group 005: Air-flow flap positioning motor -V71
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Display zone
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Meaning
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Explanatory Notes
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1
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Actual feedback value of potentiometer -G113 (in the positioning motor -V71)
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▪ Display value greater than 5 and less than 250
▪ Maximum permissible deviation 3 units from the specified feedback value (in the range greater than 60 but less than 190)
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2
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Specified feedback value for potentiometer -G113 (calculated by -E87)
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▪ Display range 5 - 250
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3
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Operating and display unit up to index "L" and from index "R"
-G113 value determined during the "basic setting" and stored in the -E87 with the positioning motor in the setting "Lower stop" (the air-flow flap in the evaporator intake area is closed, the air conditioner is in air recirculation mode)
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▪ Display value greater than 5 and less than 60
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Operating and display unit with index "M", "N", "P" or "Q"
The -G113 value determined during the "basic setting" and stored in the -E87 with the positioning motor in the setting "Lower stop" (the air-flow flap in the evaporator intake area is open, the air conditioner is in fresh air operation)
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▪ Display value greater than 190 and less than 250
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Display zone
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Meaning
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Explanatory Notes
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4
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Operating and display unit up to index "L" and from index "R"
The -G113 value determined during the "basic setting" and stored in the -E87 with the positioning motor in the setting "Lower stop" (the air-flow flap in the evaporator intake area is open, the air conditioner is in fresh air operation)
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▪ Display value greater than 190 and less than 250
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Operating and display unit with index "M", "N", "P" or "Q"
-G113 value determined during the "basic setting" and stored in the -E87 with the positioning motor in the setting "Lower stop" (the air-flow flap in the evaporator intake area is closed, the air conditioner is in air recirculation mode)
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▪ Display value greater than 5 and less than 60
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Notes:
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◆ In right-hand drive vehicles, the positioning motor -V71 only controls the fresh-air and recirculated-air flap. There is no air-flow flap.
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◆ If the feedback value in display zone 1 is less than 5 (short circuit) or greater than 250 (open circuit),perform electrical test => Page 01-140 onwards.
-
◆ The actual feedback value (between 5 and 60 and between 190 and 250) is specified as the permitted tolerance range for the positioning motor stop or the flap in the operating and display unit -E87.
-
◆ If the display values in display zones 3 or 4 are ambient the permitted range =>Fault table, Page 01-18.
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◆ With operating and display units -E87 with Part No. 8D0 820 043 and index "M","N", "P" or "Q" the display in zones 3 and 4 is swapped over.
Display group 006:
Calculated ambient temperature for ambient temperature display -G106, measured values for fresh air intake duct temperature sensor -G89, ambient temperature sensor -G17 and sunlight penetration photosensor -G107
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Display zone
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Meaning
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Explanatory Notes
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1
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Calculated ambient temperature for the ambient temperature display -G106 in °C
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▪ In the dash panel insert
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2
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Measured value for the fresh air intake duct temperature sensor -G89 in °C
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▪ Checking=> Electrical testing, Page 01-154
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Note:
The measured value from a faulty temperature sensor or pickup is suppressed by the -E87 and the -E87 then uses an internal calculated value for the further control (this value is also displayed).
Notes on display zone 1:
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◆ The basis for the display in display zone 1 is the lower of the two ambient temperatures measured => display zones 2 and 3. When the ignition is switched off, the value is stored for up to 4 hours.
-
◆ In vehicles with automatic gearboxes, the ambient temperature is only displayed with gear engaged.
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Display zone
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Meaning
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Explanatory Notes
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3
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Measured value for the ambient temperature sensor
-G17 in °C
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▪ Checking=> Electrical testing, Page 01-154
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4
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Measured value of the sunlight penetration photosensor-G107 as %
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▪ 0...100 %, depending upon the intensity of the sunlight
|
Note:
The measured value from a faulty temperature sensor or pickup is suppressed by the -E87 and the -E87 then uses an internal calculated value for the further control (this value is also displayed).
Notes on display zone 4:
-
◆ The display value for the sunlight penetration photosensor -G107 may be changed by shining an appropriate lamp at the sensor.
-
◆ If, regardless of the light shining on the sunlight penetration photosensor -G107, the display always shows about 90% of the maximum sunlight penetration, use the current flow diagram to check the cabling to the sunlight penetration photosensor -G107 for interchanges.
Display group 007:
Sensors for centre vent temperature -G191 and footwell vent temperature -G192, dash panel temperature sensor -G56 and calculated refrigerant temperature
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Display zone
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Meaning
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Explanatory Notes
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1
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Measured value of the centre vent temperature sensor -G191 in °C
|
▪ Checking=> Electrical testing, Page 01-155
|
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2
|
Measured value of the footwell vent temperature sensor -G192 in °C
|
▪ Checking=> Electrical testing, Page 01-155
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3
|
Measured value of the dash panel temperature sensor- -G56 in °C
|
▪ Checking=> Electrical testing, Page 01-154
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4
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Refrigerant temperature supplied from dash panel insert in °C
|
▪ Auxiliary variable for control of fresh-air blower speed
|
Note:
The measured value from a faulty temperature sensor or pickup is suppressed by the -E87 and the -E87 then uses an internal calculated value for the further control (this value is also displayed).
Note on display zone 1:
In the event of a faulty display, also check encoding of the operating and display unit -E87.
Notes continued:
Note on display zone 3:
The dash panel temperature sensor -G56 is installed in the operating and display unit -E87 with only one display. The -G56 cannot be checked and replaced individually, in the event of a defect, replace the complete -E87.
Notes on display zone 4:
-
◆ The -E87 only uses the refrigerant temperature from 40 °C to control the fresh-air blower speed.
-
◆ In the absence of a signal, -53 °C is displayed as the refrigerant temperature and the refrigerant temperature calculated by the -E87.
Display group 008: Voltage at fresh-air blower -V2, voltage at terminal 58d, terminal 58s
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Display zone
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Meaning
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Explanatory Notes
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1
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Specified voltage at the fresh-air blower -V2 (calculated by the operating and display unit -E87)
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▪ 0...12.5 V
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2
|
Actual voltage at the fresh-air blower -V2
|
▪ Deviation from the specified voltage (in the vehicle voltage range): max. 0.7 V
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3
|
Voltage for illumination of the display elements in the operating and display unit -E87 (terminal 58d)
|
▪ 0...100% or up to 12.5 V with ignition activated
▪ Voltage at connector A, contact 5 to -E87 depending upon the position of the control for lighting and instruments -E20 from terminal 58d
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4
|
In the case of an -E87 with two displays: Display zone not used.
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|
|
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In the case of an -E87 with one display: Voltage for the illumination of the switches in the operating and display unit -E87 (terminal 58s)
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▪ 0...100% depending on the position of the control for illumination and instruments -E20 with side lights on
▪ 10% or less than 1.0 V when side lights are off
|
Notes on display group 008 => Page 01-131.
Notes on display zone 3:
-
◆ Checking input voltage for terminal 58 and terminal 58d at the operating and display unit -E87 => Electrical testing, Page 01-147.
-
◆ The operating controls of the operating and display unit -E87 are only illuminated when voltage is applied to terminal 58.
-
◆ If the displays on the operating and display unit -E87 are not illuminated when the side lights are off, check the encoding of the -E87 => Page 01-69.
Display group 009: Engine speed, vehicle speed and auxiliary heater
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Display zone
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Meaning
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Explanatory Notes
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1
|
Engine speed in rpm
|
|
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2
|
Display 0 =
Display 1 =
|
No speed signal detected since the ignition was switched on
Since the ignition was switched on, a vehicle speed signal has been detected at least once by speedometer -G21
|
|
|
3
|
In the event of an -E87 with two displays
|
|
|
|
Display 0 =
|
Auxiliary heater mode off
|
▪ Voltage at connector D, contact 1 to -E87 less than 5 V
|
|
|
Display 1 =
|
Auxiliary heating mode on
|
▪ Voltage at connector D, contact 1 to -E87 greater than 5 V
|
|
|
In the case of an -E87 with one display:
|
|
|
|
Display 0 =
|
Side lights off
|
▪ Voltage at connector A, contact 6 to -E87 less than 5 V (terminal 58)
|
|
|
Display 1 =
|
Side lights on
|
▪ Voltage at connector A, contact 6 to -E87 greater than 5 V (terminal 58)
|
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|---|
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Display zone
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Meaning
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Explanatory Notes
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4
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In the event of an -E87 with two displays
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Display zone not used.
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In the case of an -E87 with one display:
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Display 0 =
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Auxiliary heater mode off
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▪ Voltage at connector D, contact 1 to -E87 less than 5 V
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Display 1 =
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Auxiliary heating mode on
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▪ Voltage at connector D, contact 1 to -E87 greater than 5 V
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Note on display zone 2:
If the vehicle is moving at more than 1 km/h during the self-diagnosis, this speed will be displayed.
Notes on display zones 3 /4:
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◆ At present, it is not planned to install an auxiliary heater.
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◆ If the operating and display unit -E87 remains in operation after the ignition is switched off and if the display shows "1", locate and rectify short to positive to connector D, contact 1.
Display group 010:
Temperature switch for refrigerant, air conditioner compressor intervention, pressure switch -F129 and actuation of the heated rear screen
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Display zone
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Meaning
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Explanatory Notes
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1
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Display 0 =
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Temperature switch for "refrigerant too hot" open (refrigerant temperature OK)
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▪ Voltage at connector A, contact 11 to -E87 greater than 5 V
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Display 1 =
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Temperature switch for "refrigerant too hot" closed (refrigerant temperature OK)
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▪ Voltage at connector A, contact 11 to -E87 less than 5 V
=> display group 001, display zone 1, Page 01-110
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2
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Display 0 =
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Output, compressor intervention open
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▪ Voltage at connector C, contact 12 to -E87 less than 5 V
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Display 1 =
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Output, compressor intervention closed
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▪ Voltage at connector C, contact 12 to -E87 greater than 5 V
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Notes on display zone 1:
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◆ Checking the refrigerant temperature and the dash panel insert:
=> Electrical System; Repair group 90; Repairing the dash panel insert; Checking multiple connectors in the dash panel insert
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◆ In vehicles from Model Year 1999, the assignment of the ignition key will be notified to the -E87 by the dash panel insert together with the refrigerant temperature and the signal "Engine temperature too high" when the ignition is switched on (data telegram).The assignment of the code can only by processed by operating and display units with the Part Number 8D0 820 043 from index "M". If the refrigerant temperature is too high, no information may be transmitted.
Notes on display zone 2:
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◆ When magnetic clutch -N25 is engaged, the output is closed (voltage greater than 5 V).
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◆ If, when the magnetic clutch is engaged, the voltage drops below 5 V (engine control unit or automatic gearbox control unit switches input to earth), the magnetic clutch is disabled by the operating and display unit -E87 =>display group 001, display zone 1, Page 01-110.
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
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Display zone
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Meaning
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Explanatory Notes
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3
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Display 0 =
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Air conditioner pressure switch -F129 closed
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▪ Voltage at connector C, contact 2 to -E87 less than 2 V
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Display 1 =
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Air conditioner pressure switch -F129 open
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▪ Voltage at connector C, contact 2 to -E87 greater than 2 V
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4
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In the event of an -E87 with two displays
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Display zone not used.
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In the case of an -E87 with one display:
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Display 0 =
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Heated rear window off
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▪ Voltage at connector F, contact 1 (output from -E87 to the heated rear window) less than 5 V
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Display 1 =
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Heated rear window on
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▪ Voltage at connector F, contact 1 (output from -E87 to the heated rear window) greater than 5 V
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Note on display zone 3:
When air conditioner pressure switch -F29 is open (high/low-pressure switch between contacts 1 and 2), the compressor is switched off (=> display group 001, display zone 1, Page 01-110).
Note on display zone 4:
Check the actuation of the heated rear window .
Display group 011: The last four compressor shut-off criteria
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Display zone
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Meaning
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Explanatory Notes
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1
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Fourth last compressor shutoff criterion
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▪ Coding => Page 01-110 display group 001, display zone 1
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2
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Third last compressor shutoff criterion
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3
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Last but one compressor shutoff criterion
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4
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Last compressor shutoff criterion
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Notes:
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◆ The display group "011" is only present on operating and display units with the Part Number 8D0 820 043 from index "M" (version with one display).
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◆ Only the last four compressor shut-off criteria which were effective for longer than 20 seconds are stored.
Display group 012: Increase in idle speed, actuation of radiator fan, assignment of ignition key
Note:
The display group "012" is only present on operating and display units with the Part Number 8D0 820 043 from index "M" (version with one display).
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Display zone
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Meaning
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Explanatory Notes
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1
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Display 0 =
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Idling speed regulation off
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▪ Voltage at connector A, contact 2 to -E87 less than 2 V
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Display 1 =
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Idling speed regulation on
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▪ Voltage at connector A, contact 2 to -E87 greater than 2 V
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2
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Display 0 =
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Actuation of relay for radiator fan speed 1 off
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▪ Voltage at connector A, contact 2 to -E87 greater than 5 V (fan off)
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Display 1 =
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Actuation of relay for radiator fan speed 1 on
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▪ Voltage at connector A, contact 2 to -E87 less than 5 V (fan on)
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Notes on display zone 1:
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◆ Checking the idling speed regulation function (increase in idling speed) => Page 01-60 Starting final control diagnosis for "idling speed regulation".
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◆ The condition for the switching on of the idling speed regulation is that no compressor shutoff criterion exists which does not allow the magnetic clutch to be switched on (e.g. pressure switch -F129 open, engine not running or operating mode "Econ" selected).
Note on display zone 2:
The radiator fan is switched by the -E87 to 1st speed as long as no compressor shutoff criterion exists which does not permit the magnetic clutch to be switched on (e.g. engine not running or operating mode "Econ" selected).
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Display zone
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Meaning
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Explanatory Notes
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3
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Display 0 =
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The ignition was switched on with a key for which there is no assignment in the dash panel insert.
No information was received from the dash panel insert.
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▪ Check adaption of the ignition key.
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Display 1 =
(2, 3 or 4)
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The ignition was switched on with the key which was set to position 1 (2, 3 or 4) in the dash panel insert.
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▪ Up to 4 keys may be assigned.
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4
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Display zone not used.
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Notes on display zone 3:
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◆ In vehicles from Model Year 1999, the assignment of the ignition key will be notified to the -E87 by the dash panel insert together with the refrigerant temperature and the signal "Engine temperature too high" when the ignition is switched on (data telegram).The assignment of the code can only by processed by operating and display units with the Part Number 8D0 820 043 from index "M". If the refrigerant temperature is too high, no information may be transmitted.
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◆ The assignment of the ignition key can only be recognised and therefore transmitted by the dash panel insert on vehicles fitted with an immobiliser.
=> Electrical System; Repair group 90; Repair dash panel insert
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◆ When the ignition is switched on, the -E87 starts with the setting which was valid the last time the ignition was switched off with this key (temperature, air distribution, fresh air blower speed).
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◆ Check signal from dash panel insert =>Electrical check, Page01-169.
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