Signal Missing

Signal missing

Checking the connectors
Check that the bulb is intact.
Check the connectors for the upper electronic module (UEM) and roof lamp module. Check for contact resistance and oxidation. Check for loose connections.
Remedy as necessary.

Other information:
- To access or replace the lamp, see Replacing interior lighting Replacing Interior Lighting
- To access the connector for the upper electronic module (UEM), see Upper electronic module (UEM) rear view / door mirror, replacing Upper Electronic Module (UEM)/Rearview Mirror, Replacing
- Checking wiring and terminals Checking Wiring And Terminals.









Was a fault detected?

Yes - Verification

No - Checking for open-circuits and short-circuits

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Checking for open-circuits and short-circuits
Check the cable between the upper electronic module (UEM) and the roof lamp module. Check for an open-circuit. Check for a short-circuit to supply voltage.

UEM-0035 Left front reading lamp
Control module terminal #18 and roof lamp module terminal #3A.

UEM-0037 Right front reading lamp
Control module terminal #6 and roof lamp module terminal #4A.

Other information:
- For further information about signals and other values, see Signal description, upper electronic module (UEM) Signal Description, Upper Electronic Module (UEM)
- To connect the breakout box, see Connecting the breakout box Connecting The Breakout Box, Driver Door Module (DDM) / Passenger Door Module (PDM)
- Checking wiring and terminals Checking Wiring And Terminals.









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 relevant lamp button and lamp are functioning.

Does the lamp function?

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 - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking the connectors

FAULT-TRACING FAILED - No Fault Found

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