Signal Too Low

Signal too low

Checking the signal from the control switch




- Ignition off.
- Check that all doors are shut.
Try locking and unlocking the car with the key.

Is the function OK?

Yes - Intermittent fault

No - Checking the control switch in the lock unit

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Checking the control switch in the lock unit








- Ignition off.
- Remove the driver's door door panel according to Front door Front Door.
- Remove the control switch connector.
- Ignition on.
Read off the control switch status.
The value should be HIGH.





Is the value HIGH?

Yes - Replacing the component

No - Checking the wiring

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Replacing the component
Try a new control switch according to Door lock front door Door Lock Front Door.

Select Continue.

Continue - Verification

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Checking the wiring




- Ignition off.
Check the cable between control module #A18 and control switch #3 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.

Other information:
- For further information about signals and other values, see Signal specification, lock and alarm, (VGLA) Signal Specification.
- To connect the breakout box, see Connecting the breakout box, lock and alarm (VGLA) Connecting The Breakout Box, Lock And Alarm (VGLA).









Select "Continue" when the fault has been remedied.

Continue - Verification

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Verification

Hint: After carrying out the repair, check that the fault has been remedied as follows:








- Ignition off.
- Reinstall the connectors, components etc.
- Ignition on.
Read off the control switch status
The value should be HIGH.





Is the value HIGH?

Yes - FAULT FOUND

No - Fault-tracing information
No Fault Found

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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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - No Fault Found

Attempt New Test - Checking the signal from the control switch

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Intermittent fault
Check the cable between control module #A18 and control switch #3 for an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults.

Other information:
- For further information about signals and other values, see Signal specification, lock and alarm, (VGLA) Signal Specification.
- To connect the breakout box, see Connecting the breakout box, lock and alarm (VGLA) Connecting The Breakout Box, Lock And Alarm (VGLA).









Select Continue.

Continue - Fault-tracing information
No Fault Found

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Fault-tracing information




Information

Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Do you want to view the information again?

Yes - Attempt New Test

No - FAULT FOUND

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FAULT FOUND - FAULT FOUND

Attempt New Test - Checking the signal from the control switch

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