Checking Cable And Component Sub

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS CORPORATION

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:

Ignition off
Unplug the MOST connector from the subwoofer module (SUB).
Connect the MOST cable to special tool: see 9512867
Ignition on
Activate the infotainment system.
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.
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 subwoofer module (SUB). 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 fiber optic 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 subwoofer module (SUB) power supply and ground connection.
Inspect the MOST connection for dirt, loose contacts and damage.
If no fault can be found, change the subwoofer module (SUB).

Use the VCT2000 (or appropriate scan tool) to obtain a MOST network status reading.

Remedy as necessary.

Other information

Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

Courtesy of VOLVO CARS CORPORATION

Fig 3: Identifying Subwoofer Module (SUB)

Courtesy of VOLVO CARS CORPORATION

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Refer to VERIFICATION