Checking the cable

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off
• Disconnect the connector from the central electronic module (HEM)
• Disconnect connector (9/12) from the front left seat heater.

  Check the signal cable between central electronic module (HEM) terminal #11B and front left seat heater (9/12) connector terminal #2. Check for a short-circuit to ground. Check for an open-circuit.

  Remedy as necessary.

  Other information: 

  • For information about the central electronic module (HEM) connector, see Central electronic module (HEM), replacing
  • To connect the breakout box, see Connecting the breakout box
  • For information about signals, see Signal specification
  • See Checking wiring and terminals .
  Fig 2: Identifying Connector Terminals

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

  Courtesy of VOLVO CARS OF NORTH AMERICA.
  Fig 4: Identifying Central Electronic Module (HEM) And Connector Terminals

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Is the cable OK? 

• YES 

  Refer to Verification 

• NO 

  Refer to Replacing the seat heater control module