Checking the power supply and ground for the audio module (AUM)

Check the fuse in the passenger compartment fusebox for the main unit/audio module (AUM).

NOTE:

If the fuse has blown, check the circuit after the fuse before replacing the fuse. Check for a short-circuit to ground. Then replace the fuse.

Check the connector for the main unit/audio module (AUM). Check for contact resistance and oxidation.

Check the power supply cable for the main unit/audio module (AUM). Check for an open-circuit.

Check the ground cable between the main unit/audio module (AUM) and the ground terminal. Check for an open-circuit. Also check the ground terminal. Check for contact resistance and oxidation.

Remedy as necessary.

Other information:

To replace the fuses, see Fusebox, passenger compartment, replacing
To replace the main unit/audio module (AUM):
- For -2004, see:Radio cassette player, replacing .
- For 2005-, see:Audio unit, replacing .
To connect the breakout box, see Connecting the breakout box, Audio control module
For information about signals and connectors, see Signal specification, audio control module
For information about checking wiring and terminals see Checking wiring and terminals .

Fig 1: Breakout Box

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohm Meter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Was a fault detected?

YES
Refer to Checking the function of the audio module (AUM)
NO
Refer to Signal missing