Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking the signal from the control switch




- Ignition on.
Read off status of the central locking switch.
The value should be HIGH.





Is the value HIGH?

Yes - Verification

No - Checking the central locking switch

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Checking the central locking switch




- Ignition off.
Remove the central locking switch from the passenger door.
Disconnect the central locking switch.
Read off the status of the central locking switch.
The value should be HIGH.

Other information:
- To access / replace the connector for the central locking switch, see Door panel switch, replacement Removal and Replacement.





Is the value HIGH?

Yes - Replacing components

No - Checking cables

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Replacing components
Replace the central locking switch for the passenger door according to Door panel switch, replacement Removal and Replacement.

Continue - Verification

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Checking cables
Check the wiring between control module #A6 and passenger door central locking switch #C3 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the wiring between control module #A4 and passenger door central locking switch #C5 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the wiring between control module #A16 and passenger door central locking switch #C6 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.

Other information:
- For further information about signals and other values, see Signal specification, lock and alarm (VGLA) Signal Specification, Lock and Alarm (VGLA).
- To connect the breakout box, see Connecting the breakout box, lock and alarm (VGLA) Connecting the Breakout Box.
- To access the control module connector, see Replacing the control module Replacing the Control Module.
- To access / replace the connector for the central locking switch, see Door panel switch, replacement Removal and Replacement.





Continue - Verification

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Verification





Verification

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








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





Is the value HIGH?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - 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 - Exit fault-tracing

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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