VOLVO
DDM-6C1B - Child-proof lock motor. Signal too low
System
Driver Door Module (DDM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsS40 (2004–2013), V50 (2004–2013)
Show models by year and engine (2)
What does this fault code mean?
The driver or passenger door module (DDM/PDM) has registered that the signal wire to the child lock motor in the rear door is too low. The wire is short-circuited to ground, and the child lock then does not work.
Possible causes
- Signal wire to the child lock motor short-circuited to ground
What you can do
- 1Read out and note the fault code, clear it, then with ignition on check that the child lock works
- 2Check the wire in the rear door at the cable grommet for chafing and crush damage
- 3With ignition off, use a multimeter to confirm the signal wire has no contact with ground (body). Replace the wire if it is damaged
- 4Check the connectors in the rear door for oxidation and loose contacts
- 5If no fault is found, have a workshop swap out the rear-door control unit
Symptoms you may notice1
- Child lock does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.