VOLVO
DDM-B1A9887 - LIN Bus circuit #1. Bus Signal / Message Failures. Missing message
System
Driver Door Module (DDM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsS80 (2007–), V70 (2008–), XC60 (2009–), XC70 (2008–)
Show models by year and engine (4)
What does this fault code mean?
The driver and passenger door modules communicate over the LIN bus with the rear door modules and with the control panel in the driver door. The fault is stored when no signal is received, which can be caused by a broken or short-circuited communication wire, or by a poor connection in the connectors.
Possible causes
- Open circuit in the communication wire
- The communication wire is short-circuited to ground
- The communication wire is short-circuited to supply voltage
- Contact resistance or oxidation in the connections
- Open circuit in the connections
- Short circuit in the connections
What you can do
- 1Read and clear the code and road test to see whether it returns
- 2Check that the fuses are intact
- 3Visually check the communication wire between the driver door and rear door modules for visible damage
- 4Check that the connectors in the driver door and the rear door are secure and free from moisture and oxidation
- 5Use a multimeter to check that the bus wire has no break and no contact with ground or supply voltage
- 6If the fault remains, have a workshop with diagnostic equipment check the communication between the door modules
Symptoms you may notice2
- The control panel in the driver door does not work
- The electric window lift in the rear door does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.