VOLVO
DDM-B12E423 - Rear Door Lock Switch - Interior. General Signal Failures. Signal stuck low
System
Driver Door Module (DDM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsS60 (2011–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V60 Cross Country (2015–)
What does this fault code mean?
The rear door module checks the signal from the local locking button in the rear door and informs the module of the corresponding front door about its status. The fault is stored when the button has been held pressed for a long time, or when the signal wire has been short-circuited to ground for a long time. The signal from the button is then ignored until it is no longer pressed.
Possible causes
- The button is stuck in the pressed position
- The signal wire is short-circuited to ground
- Moisture and/or oxidation in the connections
- The local locking switch is damaged
What you can do
- 1Check that the button in the rear door can be pressed in and released, and that it is not stuck in the pressed position
- 2Check that the fuses are intact
- 3Test locking with the button in the front door and see whether the fault follows the rear door button
- 4Check the connector to the button in the rear door for moisture and oxidation
- 5Use a multimeter to check that the signal wire from the button has no contact with ground
- 6If the fault remains, have a workshop with diagnostic equipment check the button and the rear door module
Symptoms you may notice3
- Central locking with the button in the door panel does not work
- The interior door locks do not work
- Locking and unlocking with the central locking does not work
What the fault can affect1
- The signal from the button is ignored until it is no longer pressed
General guidance for car owners. Diagnosis on the car can point to a different cause.