Signal Too Low

Signal too low

Checking for a short-circuit
Check that the button has not jammed in its depressed position.
Check the cable from the upper electronic module (UEM) to the rear reading lamp module. Check for a short-circuit to ground.
Remove the connector from the reading lamp module and measure between the connector and the upper electronic module (UEM) as follows.

UEM-0008 Right rear reading lamp
Control module terminal #20 and reading lamp module terminal #6.

UEM-0009 Left rear reading lamp
Control module terminal #20 and reading lamp module terminal #2.
Replace the cable if a fault is found.

Other information:
- For further information about signals and other values, see Signal specification Signal Specification, Upper Electronic Module (UEM)
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- To access or replace the reading lamp module, see Bulb, reading lamp, rear, replacing Service and Repair
- To access the connector for the upper electronic module (UEM), see Upper electronic module (UEM) rear view / door mirror, replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals.









Was a fault detected?

Yes - Verification

No - No Fault Found

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

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 relevant lamp button and lamp are functioning.

Does the lamp function?

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

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

Attempt New Test - Checking for a short-circuit

FAULT-TRACING FAILED - No Fault Found

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