Internal Fault

Internal fault

Erasing diagnostic trouble codes (DTCs)




- Ignition on.




- Erase DTCs.

Continue - Reading off diagnostic trouble codes (DTCs).

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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-412 recur?

Yes - Checking cables

No - Intermittent fault

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Checking cables




- Ignition off.
Check fuse 15.

Hint: If the fuse is blown, check the circuit after fuse 6 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Check cable between fuse 15 and ultrasonic sensor connector #6 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check cable between ultrasonic sensor #7 and ground for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Other information:
- The voltage between ultrasonic sensor connectors #6 and ground should be battery voltage.
Remedy as necessary.









Were any faults found in the cables?

Yes - Erasing diagnostic trouble codes (DTCs)

No - Replacing component

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Replacing component
Try new ultrasonic sensors according to Replacing ultrasonic sensor Replacing Ultrasonic Sensor.

Continue - Erasing diagnostic trouble codes (DTCs)

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Erasing diagnostic trouble codes (DTCs)




- Ignition on.
Erase DTCs.






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 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-412 recur?

Yes - Fault-tracing information

No - FAULT FOUND

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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

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Intermittent fault
Check cable between fuse 15 and ultrasonic sensor connector #6 for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults. Check cable between ultrasonic sensor #7 and ground for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.










Continue - Fault-tracing information

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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

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