Faulty Signal

Faulty signal

Checking components and wiring

Note! The diagnostic trouble code (DTC) may be stored if the incorrect roof spoiler is installed. Do not replace the roof spoiler if the stop lamp is working.

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

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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

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VERIFIED - Fault Found

VERIFICATION FAILED - Fault-tracing information

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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

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking components and wiring

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