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/telephone, changing
• To access/replace the sub-antenna:

  See Radio equipment, replacing

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

Fig 1: Identifying 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