Checking for contact resistance and oxidation

Repair or replace the connectors of the sub-antenna and the audio module (AUM), checking for contact resistance and oxidation:

See Contact resistance and oxidation 

If radio reception is now OK, the fault was poor contact in the connectors.

Other information: 

• See Radio/carphone, replacing (-2004)  or Audio unit, replacing (2005-) 
• To access/replace the sub-antenna:

  See Windshield antenna and amplifier, replacing 

• See Connecting the breakout box, Audio control module 
• See Audio control module, green connector 

Fig 1: Breakout Box

Courtesy of VOLVO CARS OF NORTH AMERICA.

Is the radio reception OK? 

• YES 

  OKAY:  Troubleshooting has been completed.

• NO 

  Refer to Checking the wiring and component