Diagnostic Trouble Code (DTC) Information Mmm-U200531

Condition 

The multimedia module (MMM) is continually supplied information on vehicle speed. The multimedia module (MMM) has an integrated GPS receiver that calculates vehicle speed. Information on vehicle speed is sent from the brake control module (BCM) to the infotainment control module (ICM) via CAN. The infotainment control module (ICM) forwards information to the multimedia module (MMM) via MOST.

The diagnostic trouble code (DTC) is stored if the control module detects that:

• Vehicle speed has exceeds 36 km/h (22 mph) for 10 seconds according to the speed calculation in the GPS receiver.
• No vehicle speed signal on the MOST network.

The control module's test for the diagnostic trouble code (DTC) starts in the event of:

• Ignition switch position II.

Fig 1: Identifying Multimedia Module (MMM)

Courtesy of VOLVO CARS CORPORATION

Substitute Value 

• None.

Possible Source 

• Problems with the MOST network.
• Interrupted or missing communication with the Brake control module (BCM).

Fault symptom[s] 

• Car position on map is incorrect