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Checking brake light switch and brake pedal switch > < Test conditions

Leon Mk2

Test sequence
Test sequence
–  Connect fault reader -V.A.G 1551- (-V.A.G 1552-) and select engine electronics control unit with the “Address word” 01. When doing this the engine must be running at idling speed. (Connecting fault reader and selecting engine electronics control unit → Vehicle diagnosis, testing and information system VAS 5051.)
   
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, 0 and 7 for “Display group number 7” and confirm entry with Q key.
  
Read measured value block           HELP
Input display group number XXX
Indicated on display:
–  Observe coolant temperature figure in display zone 4. The temperature figure must Increase uniformly and without interruption.
  Note!
t  In cases of a fault the fuel temperature is displayed as an alternative.
t  If the display on fault reader jumps by 2...5 °C, it is a control unit fault and not caused by a defective sender.
–  If no realistic display appears in display zone 4 or the fuel temperature is displayed as a substitute. Check coolant temperature sender and wiring connections to sender as follows:
–  Press the → key.
–  Press keys 0 and 6 for the function “End output” and confirm entry with the Q key.
–  Switch off ignition.
  
Read measured value block 7            →
15.4 °C            15.9 °C       16.7 °C
–  Pull the 4-pin connector off coolant temperature sender -G62- with coolant temperature gauge sender -G2--arrow-.
  E23-0010
–  Measure resistance between sender contacts 1+3.
  N23-0023
Specification see diagram
Scale A shows resistance values for temperature range 0...50 °C and scale B the values for temperature range 50...100 °C.
Examples:
t  30 °C corresponds to a resistance from 1500...2000 Ω
t  80 °C corresponds to a resistance from 275...375 Ω
If the specification is not attained:
–  Renew coolant temperature sender -G62- with coolant temperature gauge sender -G2- → Item.
If specification attained:
–  Remove wiper arms and cowl panel: → Electrical system; Rep. Gr.92
  N24-0157
–  Connect test box -V.A.G 1598/22- to control unit wiring harness.
  N24-0709
–  Check wiring for open circuit between test box and 4-pin connector according to current flow diagram. Contact 1+ socket 70 Contact 3+ socket 54 Wire resistance: max. 1.5 Ω
–  Additionally check wires for short to one another, to vehicle earth and to battery positive. Specification: ∞Ω
If no wiring fault is detected:
–  Renew engine control unit → Chapter.
  N23-0020

Checking brake light switch and brake pedal switch > < Test conditions