Checking Cable And Component PHM

Checking fuses 

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

Replace the fuse if it is damaged.

Checking the cause of the fault 

Check the cause of the fault as follows:

1. Ignition off
2. Unplug the MOST connector from the phone module (PHM).
3. Connect the MOST cable to special tool 9512867 .
4. Ignition on
5. Activate the infotainment system.
6. Check that MOST network communication is in working order. Do this by obtaining a status reading of the MOST locked parameter for at least 30 seconds. This parameter shows 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.

If menu text is displayed, communication on the MOST network is OK. The cause of the fault then lies in the phone module (PHM). Continue fault tracing by checking the component.

If menu text is not displayed, communication on the MOST network is not OK. The cause of the fault then lies in the next control module. Continue fault tracing by checking the fiberoptic cable.

Checking the cable 

• Inspect the MOST connection for dirt, loose contacts and damage.
• If no fault can be found in the MOST connection, change the MOST cable.

Checking the component 

• Check the phone module (PHM) power supply and ground connection.
• Inspect the MOST connection for dirt, loose contacts and damage.
• If no fault can be found, change the phone module (PHM).

Remedy as necessary.

Other information 

• See: PHONE MODULE (PHM) (2004-2011)
• See: CHECKING THE SUPPLY VOLTAGE/GROUND TERMINAL (2009-2011)
• See: SIGNAL SPECIFICATION
• See: FIBER OPTIC CABLE HARNESS, REPAIRING
• See: DIAGNOSTIC INSTRUCTIONS - FIBER OPTIC CABLE
• See: COMPONENT LOCATION, INFOTAINMENT (2005-2011)

• Continue 

  See: VERIFICATION