VOLVO
MMM-B1A8911 - Satellite Antenna. General Electrical Failures. Circuit short to ground
System
Multi Media Module (MMM)
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 module checks the DC voltage on the wire that carries the signal from the GPS antenna. The code is set when that DC voltage is too low, which may be caused by a trapped antenna cable that shorts its screen to ground, or by a signal wire shorted to ground.
Possible causes
- Trapped antenna cable that short-circuits its screen to ground
- The signal wire is short-circuited to ground
- Faulty GPS receiver inside the MMM unit
What you can do
- 1Check the fuses for the multimedia system and make sure none has blown
- 2Look for a trapped or chafed antenna cable, especially where it passes through the body or near moving parts
- 3Check that the connectors on the antenna cable and at the multimedia module are fully seated and free from oxidation
- 4Erase the code and road test the car to see whether navigation works and the code stays away
- 5Have a workshop measure the signal wire against ground and, if faulty, replace the antenna cable or the GPS receiver in the multimedia module (MMM)
Symptoms you may notice2
- The car position on the map is incorrect
- The navigation does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.