Faulty Signal

Faulty signal

Erasing diagnostic trouble codes (DTCs)




- Ignition on.




- Erase DTCs.

Continue - Reading off diagnostic trouble codes (DTCs).

-------------------------------------------------

Reading off diagnostic trouble codes (DTCs).




- Remove key from ignition switch
- Ensure that all doors, the hood and trunk lid are shut.
- Lock the car with the remote control.
- Wait approximately 10 seconds.
- Unlock the car with the remote control.
- Ignition on.




- Read off diagnostic trouble codes (DTCs).

Does diagnostic trouble code (DTC) GLA-422 recur?

Yes - Checking connectors

No - Intermittent fault

-------------------------------------------------

Checking connectors




- Ignition off.
- Remove passenger side loudspeaker grille on dashboard.
Check microphone connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Ignition on.




- Erase DTCs.

Continue - Reading off diagnostic trouble codes (DTCs).

-------------------------------------------------

Reading off diagnostic trouble codes (DTCs).




- Remove key from ignition switch
- Ensure that all doors, the hood and trunk lid are shut.
- Lock the car with the remote control.
- Wait approximately 10 seconds.
- Unlock the car with the remote control.
- Ignition on.




- Read off diagnostic trouble codes (DTCs).

Does diagnostic trouble code (DTC) GLA-422 recur?

Yes - Replacing component

No - FAULT FOUND

-------------------------------------------------

Replacing component
Try a new glass breakage sensor microphone according to Replacing glass breakage sensor Removal and Replacement.

Continue - Erasing diagnostic trouble codes (DTCs)

-------------------------------------------------

Erasing diagnostic trouble codes (DTCs)




- Ignition on.
Erase DTCs.






Continue - Verification

-------------------------------------------------

Verification

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




- Ignition off.
- Reinstall connectors, components etc.
- Remove the key.
- Ensure that all doors, the hood and trunk lid are shut.
- Lock the car with the remote control.
- Wait approximately 10 seconds.
- Unlock the car with the remote control.
- Ignition on.




- Read off diagnostic trouble codes (DTCs).

Does diagnostic trouble code (DTC) GLA-422 recur?

Yes - Fault-tracing information

No - FAULT FOUND

-------------------------------------------------

Fault-tracing information
Verification indicates that the fault persists.

Do you want to repeat fault-tracing?

Yes - Erasing diagnostic trouble codes (DTCs)

No - No Fault Found

-------------------------------------------------

Intermittent fault
- Ignition off.
- Remove passenger side loudspeaker grille on dashboard.
Check microphone connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.






Continue - Fault-tracing information

-------------------------------------------------

Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.

Do you want to repeat fault-tracing?

Yes - Erasing diagnostic trouble codes (DTCs)

No - No Fault Found

-------------------------------------------------