Handbrake Lamp Not Working

Handbrake Lamp Not Working

Fault symptoms
Handbrake lamp not working

Checking the wiring harness
Jiggle the leads and in-line connectors at various points and in different directions to detect any intermittent breaks or short circuits in the wiring. Observe the multimeter, test lamp or diagnostic instrument while carrying out this check.

Diagnostic procedure

1. Handbrake switch
^ Unplug the Switch connector, handbrake: (43)





^ Connect a jumper lead to a good grounding point.





^ Turn the ignition switch to ON.





^ The warning lamp should light up.

Is the function correct?
YES
^ Repair or replace the parking brake switch
^ Go to step 3.
NO
^ Go to step 2.

2. Checking the lead
^ Unplug the main instrument unit's 20-pin connector: (540)





^ Connect a test lamp to B+ and pin 11 of MIU K20.





^ Turn the ignition switch to ON.





^ Connect a jumper lead to a good grounding point.





^ Turn the ignition switch to ON.





^ The test lamp should light up.





Is the function correct?
YES
^ Replace: Handbrake lamp.
^ Go to step 3.
NO
^ Repair or replace the lead.
^ Go to step 3.

3. Final check
^ Clear diagnostic trouble codes in all systems.





^ Carry out a function check.





Is the function correct?
YES
- The steps taken to rectify the fault were correct.
NO
- See Fault diagnosis, general, "Before changing a control module." Before Changing A Control Module