Signal Too High / Signal Missing

Signal too high / Signal missing

Checking components and wiring
Check the connectors for the rear electronic module (REM) and tail lamps. Check for contact resistance and oxidation. Check for loose connections. Check for damage carefully.
Check the power supply cable between rear electronic module (REM) terminal #4D (#B04) and connector terminal #7 on the left tail lamp. Check for an open-circuit. Check for a short-circuit to supply voltage.
Check the power supply cable between left tail lamp connector terminal #7 and right tail lamp terminal #7. Check for an open-circuit. Check for a short-circuit to supply voltage.
Also check the ground lead between tail lamp connector terminal #8 and the ground terminal. Check for an open-circuit.
Try a new brake light if no faults were found.
Remedy as necessary.

Other information:
- To access the rear electronic module, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- To connect the breakout box, see Connecting the breakout box Connecting Breakout Box, Rear Electronic Module (REM)
- For information about signals, see Signal specification Signal Specification
- Checking wiring and terminals Checking Wiring And Terminals
- For further information about ground terminals, see wiring diagram.





Continue - Verification

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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 stop lamp lights when the brake pedal is depressed and goes out when the brake pedal is released.

Is the stop lamp working?

Yes - Verification completed

No - 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 - Exit Fault-Tracing

No - Attempt New Test

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Attempt New Test - Checking components and wiring

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