Faulty Signal

Faulty signal

Checking components and wiring
Check the rear electronic module (REM) and the high-mounted stop lamp connectors. Check for contact resistance and oxidation. Check for loose connections. Check for damage carefully.

Hint: When the stop lamp is activated, the voltage between #1 and #5 in the connector for the stop lamp must be battery voltage.

Check the power supply cable between rear electronic module (REM) terminal #4D (#B04) and brake light connector terminal #1. Check for an open-circuit. Check for a short-circuit to ground.
Check the ground lead between brake light connector terminal #5 and the ground terminal. Check for an open-circuit. Check for a short-circuit to supply voltage.
Try a new brake light if no faults were found.
Remedy as necessary.

Other information:
- To access / replace the high mounted stop lamp, see Stop lamp high mounted, replacing Stop Lamp, Rear Windshield, Replacing
- To access the rear electronic module (REM), see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- For information about signals, see Signal specification Pinout Values and Diagnostic Parameters
- Checking wiring and terminals Checking Wiring And Terminals.










Continue - Verification

-------------------------------------------------

Verification




Verification

Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Check that the high mounted stop light comes on when the brake pedal is pressed.

Is the high-level stop lamp working?

Yes - VERIFIED

No - VERIFICATION FAILED

------------------------

VERIFIED - Fault Found

VERIFICATION FAILED - Fault-tracing information

-------------------------------------------------

Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - FAULT-TRACING FAILED

No - Attempt New Test

------------------------

FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking components and wiring

-------------------------------------------------