Warning Lamp, Handbrake

Warning Lamp, Handbrake

Fault symptoms
The handbrake warning lamp is inoperative.

Check the wiring harness
Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short-circuits in the leads. Observe the multimeter, test lamp or diagnostic tool during the test.

Diagnostic procedure

1. Handbrake switch
- Unplug connector: Contact, handbrake switch: (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
- Change: Handbrake switch.
- Go to step 3.
NO
- Go to step 2.

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






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






- Connect a jumper lead to a good grounding point.






- The test lamp should light up.






Is the function correct?
YES
- Replace: Handbrake lamp.
- Go to step 3.
NO
- Repair or replace the lead between the female connector's pin and pin 11 of the MIU's 20-pin connector.
- Go to step 3.

3. Final check
- Clear the diagnostic trouble codes in all systems.






- Perform a functional test.






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