GLA-412

GA. DTC 412

Condition





Diagnostic trouble code (DTC) GLA-412 is stored after approximately 2 seconds if the control module registers an internal fault in the ultrasonic sensor control module when the alarm system is powered up or when the alarm is activated or deactivated.

Substitute Value
None.

Possible Source
Defective ultrasonic sensor

Fault Symptom(s)
The indicator LED flashes for 15 seconds when the ignition is switched on.
The system will not trigger the alarm if there is movement in the passenger compartment.

Start fault-tracing with GB.


GB1. Erasing Diagnostic Trouble Codes (DTCs)





Ignition on.
Erase diagnostic trouble codes (DTCs).
Then continue with GB2.


GB2. Reading Off Diagnostic Trouble Codes (DTCs)

Remove key from ignition switch.
Ensure that all doors, the hood, trunk lid/tailgate are closed.
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: Go to GB3.
No: Go to GB7.


GB3. 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 WWA2 WW. Checking Wiring and Connections

Check cable between fuse 15 and ultrasonic sensor connector #6 for an open-circuit according to WWA2 WW. Checking Wiring and Connections

Check cable between ultrasonic sensor #7 and ground for an open-circuit according to WWA2 WW. Checking Wiring and Connections

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: Go to GB5.
No: Go to GB4.

GB4. Replacing Component

Try new ultrasonic sensors.
Then continue with GB5.


GB5. Erasing Diagnostic Trouble Codes (DTCs)





Ignition on.
Erase diagnostic trouble codes (DTCs).
Then continue with GB6.

GB6. Verification





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

Ignition off.
Reconnect connectors, reinstall components.
Remove the key.
Ensure that all doors, the hood, trunk lid/tailgate are closed.
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 not found
No: Fault corrected


GB7. Intermittent Fault





heck cable between fuse 15 and ultrasonic sensor connector #6 for an intermittent open-circuit according to WWB2. Check cable between ultrasonic sensor #7 and ground for an intermittent open-circuit according to WWB2 WW. Checking Wiring and Connections Operation done