audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

ABOUT US
Test step "2” > < Test steps "1” to "4”

A4 Mk2

Test step “1”
Test step “1”
Power supply and earth connection of operating and display unit, Climatronic control unit -J255-
   
Vehicle diagnostic, testing and information system -VAS 5051A-, measurement mode: Multimeter, voltage measurement (20 VDC)
l  Adapter cable -V.A.G 1598/12- connected
Test stepTest box -V.A.G 1598A- socketChecking of
l  Test conditions
–  Additional operations
SpecificationMeasures to be taken if reading does not match specification
1.112
+
13
t  Terminal “30” and earth connection at operating and display unit, Climatronic control unit -J255-
l  Ignition off
t  approx. battery voltage
–  Use current flow diagram to repair power supply/earth connection
1.216
+
13
t  Earth connection at operating and display unit, Climatronic control unit -J255-
l  Ignition on
t  0 V
–  Use current flow diagram to locate and eliminate short to positive in earth connection (signal earth)
1.312
+
16
t  Earth connection at operating and display unit, Climatronic control unit -J255-
l  Ignition on
t  0 V
–  Use current flow diagram to locate and eliminate short to earth in earth connection (signal earth)

   
Vehicle diagnostic, testing and information system -VAS 5051A-, measurement mode: Multimeter, voltage measurement (20 VDC)
l  Adapter cable -V.A.G 1598/11- connected
Test stepTest box -V.A.G 1598A- socketChecking of
l  Test conditions
–  Additional operations
SpecificationMeasures to be taken if reading does not match specification
1.413
+
earth → Note		Terminal “75” at operating and display unit, Climatronic control unit -J255-
l  Ignition on
t  approx. battery voltage
–  Use current flow diagram to repair power supply to operating and display unit, Climatronic control unit -J255-
1.534
+
earth → Note
t  Earth connection at operating and display unit, Climatronic control unit -J255-
l  Ignition on
t  0 V
–  Use current flow diagram to locate and eliminate short to positive in earth connection (signal earth)
1.613
+
34
t  Earth connection at operating and display unit, Climatronic control unit -J255-
l  Ignition on
t  0 V
–  Use current flow diagram to locate and eliminate short to earth in earth connection (signal earth)

1)  Earth is applied to connector “D”, contact “13”.
   

Test step "2” > < Test steps "1” to "4”