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Signal from clutch pedal switch checking > < Signals from/to air conditioning system: checking

Leon Mk1

Signals from brake light switch and brake pedal switch checking
Signals from brake light switch and brake pedal switch checking
Special tools and workshop equipment required
t  Fault reader -V.A.G 1551- or vehicle system tester -V.A.G 1552- with cable -V.A.G 1551/3B-
t  Test box -V.A.G 1598/31-
t  Hand multimeter -V.A.G 1526 A- or multimeter -V.A.G 1715-
t  Adapter set -V.A.G 1594 C-
t  Current flow diagram
Check conditions
l  Fuses no. 15 and 20, OK
l  Battery voltage at least 11.5 V
Test sequence
–  Connect fault reader -V.A.G 1551/V.A.G 1552-. Then switch ignition on and select engine control unit with the “Address code” 01. (Fault reader: Connecting and selecting the engine control unit → Chapter).
   
Indicated on display:
–  Press keys 0 and 8 for the function “Read measured value block” and confirm entry with Q -key.
  
Rapid data transfer                 HELP
Select function XX
Indicated on display:
–  Press keys 0, 6 and 6 for “Display group number 66” and confirm entry with Q -key.
  
Read measured value block           HELP
Input display group number XXX
Indicated on display: (1...4 = Display fields)
–  Observe values displayed in display field 2
(3rd and 4th digits from the left)
   Specification: 0 0 0 0
–  Depress the brake pedal all the way and observe value displayed in display field 2.
(3rd and 4th digits from the left)
   Specification: 0 0 1 1
–  Press → -key.
–  Press keys 0 and 6 for the “End output” function and confirm input with the Q -key.
–  Switch off ignition.
If the specifications are not attained:
Remove lining from under steering column → General Body Repairs, Interior; Rep. Gr.68.
  
Read measured value block 66          ->
       1         2         3         4
–  Pull 2-pin connector off brake light switch -arrow-.
  E24-0036
–  To measure voltage connect the multimeter between the 2 switch contacts.
   Specification: ∞ Ω (no continuity)
–  Depress the brake pedal.
   Specification: Approx. 0,0 Ω (continuity)
If the specifications are not attained:
–  Replace the brake light switch(F) and then, adjust it → Running gear; self-diagnosis for ABS Mark 30 IE; brake light switch: adjustment:
If the specifications are obtained:
  E24-0025
–  Connect multimeter to measure voltage between contact 1 and earth.
   Specification: at least 11.5 V
If the specification is not obtained:
–  Check wire between 2-pin connector contact 1 and the main fuse and junction box for open circuit
   Wire resistance: max. 1.5 Ω
If the specification is obtained:
  E24-0026
–  Connect test box -V.A.G 1598/31- to control unit wiring harness. The engine control unit remains disconnected.
  N24-0943
–  Check wiring between test box and 2 pin connector (to control unit) for open circuit according to current flow diagram
   Contact 2+socket 56
   Wire resistance: max. 1.5 Ω
–  Additionally check wires all for short to one another.
–  Additionally check the wiring for short to battery positive or earth.
If the voltage supply and wiring have no fault:
–  Replace engine control unit → Chapter.
Signal from brake pedal switch checking
–  Remove lining from under steering column → General Body Repairs, Interior; Rep. Gr.68.
  E24-0044
–  Pull 2-pin connector off brake pedal switch -arrow-.
  E24-0040
–  To measure voltage connect the multimeter between the switch contacts.
   Specification: Approx. 0,0 Ω (continuity)
–  Depress the brake pedal.
   Specification: ∞ Ω (no continuity)
If the specifications are not attained:
–  Replace the brake pedal switch -F47- and then adjust it.
If the specifications are obtained:
  E24-0041
–  Connect multimeter to measure voltage between contact 1 and earth.
–  Switch on ignition.
   Specification: min. 11.5 V
–  Switch off ignition.
If the specification is not obtained:
–  Check wire between 2-pin connector contact 1 and the main fuse and junction box for open circuit.
   Wire resistance: max. 1.5 Ω
If the specification is obtained:
  E24-0040
–  Connect test box -V.A.G 1598/31- to control unit wiring harness. The engine control unit remains disconnected.
  N24-0943
–  Check wiring between test box and 2-pin connector (to control unit) for open circuit according to current flow diagram:
   Contact 2+socket 55
   Wire resistance: max. 1.5 Ω
–  Additionally check wires all for short to one another.
–  Additionally check the wiring for short to battery positive or earth.
If the voltage supply and wiring have no fault:
–  Replace engine control unit → Chapter.
  E24-0043

Signal from clutch pedal switch checking > < Signals from/to air conditioning system: checking