Checking the cable

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Connecting Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off
• Disconnect the connector for the climate control module (CCM)
• Ignition on.

  Check LIN bus 2. Check for a short-circuit to supply voltage.

  Take a reading on the connector for the climate control module (CCM) between terminals #7 (#31) and #1 (#25).

  If there is a short-circuit to supply voltage in LIN bus 2, continue fault-tracing by locating where the short-circuit has occurred as follows:

  • Disconnect the connector on the climate control unit that connects LIN bus 2 from the climate control module (CCM) to other components on the climate control unit
  • Check the section of LIN bus 2 that connects the climate control module (CCM) to the right-hand seat heating module (SHM) and the connector on the climate control unit. Take a reading on the connector for the climate control module (CCM) between terminals #7 (#31) and #1 (#25).

  If the fault persists, fault-trace LIN bus 2 between the climate control module (CCM), the right-hand seat heating module (SHM) and the connector on the climate control unit. Check for a short-circuit to supply voltage.

  If the fault is no longer present, fault-trace LIN bus 2 between the connector and the components on the climate control unit. Check for a short-circuit to supply voltage.

  Remedy as necessary.

  Other information: 

  • See Connecting the breakout box
  • See Signal specification
  • See Climate control, location of components
  • See Dashboard environment panel (including climate control module (CCM)), replacing
  • See Seat heating module (SHM), replacing
  • See Checking wiring and terminals
  Fig 3: Connector, Green (16- Pin)

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Was a fault detected? 

• YES 

  Refer to Verification 

• NO 

  Refer to Checking the cable 

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off
• Disconnect the connector for the climate control module (CCM).

  Check LIN bus 2. Check for a short-circuit to ground.

  Take a reading on the connector for the climate control module (CCM) between terminals #7 (#31) and #16 (#40).

  If there is a short-circuit to ground in LIN bus 2, continue fault-tracing by locating where the short-circuit has occurred as follows:

  • Disconnect the connector for the climate control unit that connects LIN bus 2 from the climate control module (CCM) to the other components on the climate control unit
  • Check the section of LIN bus 2 that connects the climate control module (CCM) to the left-hand seat heating module (SHM) and the connector on the climate control unit.

    Take a reading on the connector for the climate control module (CCM) between terminals #7 (#31) and #16 (#40).

  If the fault persists, fault-trace LIN bus 2 between the climate control module (CCM), the left-hand seat heating module (SHM) and the connector on the climate control unit. Check for a short-circuit to ground.

  If the fault is no longer present, fault-trace LIN bus 2 between the connector and the components of the climate control unit. Check for a short-circuit to ground.

  Remedy as necessary.

  Other information: 

  • See Connecting the breakout box
  • See Signal specification
  • See Climate control, location of components
  • See Dashboard environment panel (including climate control module (CCM)), replacing
  • See Seat heating module (SHM), replacing
  • See Checking wiring and terminals
  Fig 2: Connector, Green (16- Pin)

  Courtesy of VOLVO CARS OF NORTH AMERICA.

• Continue 

  Refer to Verification