Checking connectors and wiring

Check the serial cable harness between the audio module (AUM) and the external CD changer, TV receiver and road traffic information (RTI). Check by removing each DIN connector for the accessories in turn. Check that the other functions operate after each connector is removed (for example that the internal CD player functions and can be selected using the SOURCE button).

Check the DIN connectors. Check for bent or pressed in pins.

When the functions reappear the fault is probably in the wiring or connector that was removed.

Remove the DIN connectors from the accessories in the following order:

1. External CD changer
2. TV receiver
3. Road traffic information module (RTI).

Check the DIN cable and connector between the audio module (AUM) and the external amplifier. Remove the connector and check if the functions operate.

Check the connectors in the control modules and accessories. Check for intermittent faults. Try to replicate the fault by twisting and turning the connections.

Remedy as necessary.

Fig 2: Identifying Entertainment System Components And Communications Links

Courtesy of VOLVO CARS OF NORTH AMERICA.