Signal Too Low

Signal too low

Checking the wiring








- Ignition off
- Disconnect central electronic module (CEM) connector D.
Check the signal cable. Check for a short-circuit to ground. Take readings between central electronic module (CEM) terminal #D41 (#D41) and light switch module (LSM) terminal #3.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting The Breakout Box, Central Electronic Module (CEM)
- Signal specification Signal Description, Central Electronic Module (CEM)
- Location of components Locations
- Switches lights, replacing Switches Lights, Replacing
- 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
The central electronic module (CEM) has registered an internal fault in the light switch module (LSM).
If the fault is intermittent, it has been registered previously but is no longer present. Intermittent faults can be caused by interference at start up of the central electronic module (CEM) or may be a different type of fault which occurs on different occasions. The fault is evaluated depending on how it occurs. If the fault recurs, replace the light switch module (LSM).
Switches lights, replacing Switches Lights, Replacing
Remedy as necessary.





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.
Switch between parking lamps and low beam on the light switch module (LSM).
Check on the light switch module (LSM) that each lamp activates correctly.

Is the light switch module (LSM) 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 - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking the wiring

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