Signal Too Low

Signal too low

Checking the status




- Ignition on.
Activate the parking lamp.
Check if the fault is permanent or intermittent.
The parking lamp must light on activation.
The fault is permanent if the parking lamp does not activate.
If the parking lamp 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.
The fault-tracing only applies to group 1 parking lamps. Group 1 parking lamps consist of:
- Front left-hand parking lamps
- Rear right parking lamp
- License plate lighting.





Continue - Checking the component and wiring

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Checking the component and wiring
Check the voltage on the left-hand headlamp connector terminal #7 to the output on the central electronic module (CEM). The voltage must be approximately 12 V when the low beam is activated.
Check the control signal cable. Check for a short-circuit to ground.
Take readings between:
- Central electronic module (CEM) terminal #E13 (#13) and left-hand headlamp connector terminal #7.
Check the voltage on the rear right-hand lamp housing connector terminal #4 to the output on the central electronic module (CEM). The voltage must be approximately 12 V when the low beam is activated.
Check the control signal cable. Check for a short-circuit to ground.
Take readings between:
- Central electronic module (CEM) terminal #C12 (#12) and rear right-hand lamp housing connector terminal #4.
Check the voltage on the license plate lighting connector terminal #2 to the output on the central electronic module (CEM). The voltage must be approximately 12 V when the low beam is activated.
Check the control signal cable. Check for a short-circuit to ground.
Take readings between:
- Central electronic module (CEM) terminal #C13 (#13) and license plate lighting connector terminal #2.
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
- Headlamp bulb Headlamp Bulb
- 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 parking lamp.
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 status

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