Checking the signal wire

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off.
• Disconnect the 20-pin connector (group B) from the central electronic module (CEM).
• Disconnect connector from front left seat heater.

  Check signal wire between central electronic module (CEM) 11B and front left seat heater 2 for a short circuit to voltage supply as described in Short-circuit to supply voltage. Permanent faults .

  Do the necessary corrective action.

  Additional information: 

  • For information on the central electronic module (CEM) connector, see Central electronic module (CEM), replacing
  • To connect the test box, see Connecting the breakout box
  • -2004: Signal specification
  • 2005-: Signal specification
  Fig 2: Breakout Box

  Courtesy of VOLVO CARS OF NORTH AMERICA.
  Fig 3: Identifying Voltage Display

  Courtesy of VOLVO CARS OF NORTH AMERICA.
  Fig 4: Identifying Connector Terminals

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Is the signal wire correct? 

• YES 

  Refer to Replacing the component 

• NO 

  Refer to Verification