Signal Too Low

Signal too low

Checking fuses
Missing function may be due to a blown fuse.
Check that the fuse for the function in question is intact.
For information about fuses, see the wiring diagram.

Was a fault detected?

Yes - Verification

No - Checking the status

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Checking the status




- Ignition on.
Check that the courtesy lighting switch is in the auto position.
Activate the courtesy lighting
Check if the fault is permanent or intermittent.
The courtesy lighting must light on activation.
The fault is permanent if the courtesy lighting does not activate.
If the courtesy lighting is activated, this is an indication that the fault was present previously but that it is not active at the moment, i.e. the fault is intermittent.
Deactivate the courtesy lighting
Check if the fault is permanent or intermittent.
The courtesy lighting must go off when deactivated.
If the courtesy lighting is not deactivated, the fault is permanent.
If the courtesy lighting is deactivated, this is an indication that the fault was present previously but that it is not active at the moment, i.e. the fault is intermittent.





Continue - Checking the component and wiring

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Checking the component and wiring
Check the voltage on the front courtesy lighting connector terminal #12 to the output on the central electronic module (CEM). The voltage must be approximately 12 V when the courtesy lighting is deactivated.
Check the control signal cable. Check for an open-circuit. Check for a short-circuit to ground.
Take readings between:
- Central electronic module (CEM) terminal #D3 (#3) and front courtesy lighting connector terminal #12.
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)
- Control module relay box passenger compartment Service and Repair
- Lighting, internal front Lighting, Internal Front
- 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.
Click the VCT2000 symbol to activate and deactivate the courtesy lighting.
Check that the function is OK.





Is the function OK?

Yes - Troubleshooting procedure complete

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 the component and wiring

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