Signal Too High

Signal too high

Checking for a short-circuit
Check that the button has not jammed in its depressed position.
Check the cable between the upper electronic module (UEM) and the roof lamp module. Check for a short-circuit to supply voltage.

UEM-001D front left reading lamp
Control module terminal #4 and roof lamp module terminal #8A.

UEM-001E front right reading lamp
Control module terminal #16 and roof lamp module terminal #7A.
Replace the cable if a fault is found.

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)
- To access the roof lamp module switches, see Replacing interior lighting Replacing Interior Lighting
- With the ignition on and when the function is not activated, the voltage between terminal #8A (UEM 001D) and terminal #7A (UEM 001E) on the roof lamp unit (control module side) and ground should be 0 V
- Checking wiring and terminals Checking Wiring And Terminals.









Was a fault detected?

Yes - Verification

No - Replacing the component

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Replacing the component
Remove the housing with the buttons.
Press the switch for the light button.
If the switch works, replace the lamp housing.
If the switch still does not operate, replace the printed circuit board and its switches.

Other information:
- To access the interior lighting, see Replacing interior lighting Replacing Interior Lighting.

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 for a short-circuit

FAULT-TRACING FAILED - No Fault Found

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