Checking Cables And Components, BLUETOOTH Phone Module (Bpm)

Checking fuses 

Check that the fuse for the function in question is intact.

Replace the fuse if it is damaged.

Checking the fault cause 

Check the fault cause as follows:

1. Ignition off.
2. Disconnect the connector for the MOST network from the Bluetooth phone module (BPM).
3. Connect the MOST cable to special tool: 9512867
4. Ignition on.
5. Activate the infotainment system.
6. Check that the communication on the MOST-net works by reading out the status for the parameter MOST locked  for at least 30 seconds. The parameter indicates whether the MOST network is closed and communication possible. Click on the VCT2000 symbol to obtain a MOST network status reading.
7. If the parameter shows that the MOST network is not closed, check the receiving control module in the same way as described above.

The communication on the MOST network is working if the menu text is displayed. If this is the case, the fault cause is in the Bluetooth phone module (BPM). Continue the fault-tracing by checking the component.

The communication on the MOST network is not working if the menu text is not displayed. The fault cause is then in the MOST cable for the next control module. Continue the fault-tracing by checking the fiber optic cable.

Checking the cable 

• Check the MOST connection. Check for dirt, loose connections and damage.
• Replace the MOST cable if no fault is found in the MOST terminal.

Checking the component 

• Check the Bluetooth phone module (BPM) power supply and ground connection.
• Check the MOST connection. Check for dirt, loose connections and damage.
• If no fault can be found, replace Bluetooth phone module (BPM).

Remedy as necessary.

Other information: 

• See: COMPONENT LOCATION, INFOTAINMENT (2005-2011)
• See: CHECKING THE SUPPLY VOLTAGE/GROUND TERMINAL
• See: SIGNAL SPECIFICATION
• See: FIBER OPTIC CABLE HARNESS, REPAIRING
• See: DIAGNOSTIC INSTRUCTIONS - FIBER OPTIC CABLE
• See: BLUETOOTH CONTROL MODULE (2008-2009) , and BLUETOOTH CONTROL MODULE (2010-2011)

• Continue 

  See: VERIFICATION