VOLVO
PDM-B12D811 - Mirror Heater Output. General Electrical Failures. Circuit short to ground
System
Passenger Door Module (PDM)
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 PDM feeds the heating element that defrosts the exterior mirror. The module has detected that the current on the output is too high, which points to the signal cable to the mirror defroster being shorted to ground.
Possible causes
- Signal cable to the mirror defroster is shorted to ground
- Moisture and/or oxidation in the connections
What you can do
- 1Read the code, clear it and activate the defogging to see whether the mirrors heat up and whether the code comes back
- 2Check the fuses in the fuse box; if a fuse has blown, look for a short to ground before a new fuse is fitted
- 3Check the connectors in the exterior mirror and at the door module for moisture, oxidation and loose contact
- 4Use a multimeter to check that the wire to the mirror defroster has no contact with ground (the body)
- 5If you have diagnostic equipment, activate the mirror defroster and check that it starts
- 6If the wire is intact but the code comes back: have a workshop check the mirror and the door module
Symptoms you may notice1
- The defogging of the mirrors does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.