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)
- Location of components Component Location, Central Electronic Module (CEM)
- Checking wiring and terminals Checking Wiring And Terminals









Was a fault detected?

Yes - Verification

No - Component, 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)

Select Continue.

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 - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information

FAULT-TRACING FAILED - No Fault Found

Attempt New Test - Checking the component and wiring

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