Checking the wiring

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Control Module Disconnected

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off
• Disconnect central electronic module (CEM) connector D.

  The Diagnostic Trouble Code (DTC) indicates that the communication between the Central Electronic Module (CEM) and audio/telephone switch is not working.

  This may be due to a fault in the signal cable between the control modules or a damaged communication device in one or all of the control modules.

  Check the connectors for loose connections, damaged or bent terminal pins and oxidation.

  Check the signal cable. Check for an open-circuit. Check for a short-circuit to ground.

  Take readings between:

  • The Central Electronic Module (CEM) #D58 (#58) and audio/telephone switch #2.

  Also check the intermediate connectors.

  Remedy as necessary.

  Other information 

  • See Connecting the breakout box
  • See Signal specification
  • See Location of components
  • See Steering wheel module (SWM), replacing
  • See Keypad steering wheel, replacing 
  • See Contents

Was a fault detected? 

• YES 

  Refer to Verification 

• NO 

  Refer to Replacing the control module