Faulty Signal

Faulty signal

Checking the component and wiring




- Ignition off
- Light switch in position 0
- Disconnect connector A and connector B from the left-hand gas discharge lamp module (GDL)
- Disconnect the lamp housing connector.
Check that the ignition module in the lamp housing is correctly installed.
Check the connectors for contact resistance and oxidation. Check for damage carefully.
Check the following signal cables between the gas discharge lamp module (GDL) and the lamp housing. Check for an open-circuit. Check for a short-circuit to ground.
Take readings between:
- Gas discharge lamp module (GDL) terminal #B1 and lamp housing terminal #6
- Gas discharge lamp module (GDL) terminal #B6 and lamp housing terminal #12
- Gas discharge lamp module (GDL) terminal #B5 and lamp housing terminal #11
- Gas discharge lamp module (GDL) terminal #B3 and lamp housing terminal #2
- Gas discharge lamp module (GDL) terminal #B4 and lamp housing terminal #8.
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 Component Location, Central Electronic Module (CEM)
- Control module relay box passenger compartment Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals









Was a fault detected?

Yes - Verification

No - replacing

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Component, replacing
Try replacing the following components:
1. Bulb
2. Ignition module
3. Left-hand gas discharge lamp module (GDL).

Hint: Only replace one component at a time. Check whether the fault has been remedied between each replacement.

Note! If the gas discharge lamp module (GDL) is replaced, the vehicle information must be programmed and the position sensor must be calibrated. To program the gas discharge lamp module (GDL) with vehicle parameters and to calibrate the position sensor, see Calibration of position sensor, GDL lamps Testing and Inspection.

Other information:
- Headlamp bulb (Xenon) Headlamp Bulb (Xenon)
- Headlamp ballast (Xenon) Headlamp Ballast (Xenon)

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
- Light switch in position 2.
Switch between high and low beam.
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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