Faulty Signal

Faulty signal

Checking the component and wiring




- Ignition off
- Light switch in position 0
- Disconnect connector A from the left-hand gas discharge lamp module (GDL).
Check that the position sensors are correctly installed.
Check that the control arms are correctly installed on the position sensors
Check the connectors for contact resistance and oxidation. Check for damage carefully.
Check the signal cable between the front position sensor and the left-hand gas discharge lamp module (GDL). Check for an open-circuit. Check for a short-circuit to supply voltage.
Take readings between:
- Left-hand gas discharge lamp module (GDL) terminal #A1 and front position sensor terminal #4
- Left-hand gas discharge lamp module (GDL) terminal #A4 and front position sensor terminal #1
- Left-hand gas discharge lamp module (GDL) terminal #A3 and front position sensor terminal #5.
Check the signal cable between the rear position sensor and the left-hand gas discharge lamp module (GDL). Check for an open-circuit. Check for a short-circuit to supply voltage.
Take readings between:
- Left-hand gas discharge lamp module (GDL) terminal #A2 and rear position sensor terminal #4
- Left-hand gas discharge lamp module (GDL) terminal #A4 and rear position sensor terminal #1
- Left-hand gas discharge lamp module (GDL) terminal #A3 and rear position sensor terminal #5.
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)
- Position sensor rear, headlamp Position Sensor Rear, Headlamp
- Headlamp ballast (Xenon) Headlamp Ballast (Xenon)
- 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. Front position sensor
2. Rear position sensor.

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) or position sensor is replaced, the vehicle information must be programmed and the position sensor must be calibrated.

Other information:
- Position sensor rear, headlamp Position Sensor Rear, Headlamp
- Calibration of position sensor, GDL lamps Testing and Inspection

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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