Checking the wiring and component

Check the connector. Check for contact resistance. Check for oxidation. Check for loose connections.

Check that the damper motor module (DMM) is connected to power supply and ground.

Measure the voltage on the connector for the damper motor module (DMM) between terminals #1 and #3

Check LIN bus 1 by taking a reading between damper motor module (DMM) connector terminal #2 and the connector for climate control unit terminal #2. Check for an open-circuit.

Try replacing the damper motor module (DMM) if no fault is found.

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 Damper motor, recirculation, replacing
• See Checking wiring and terminals

Fig 2: Identifying Damper Motor Module (DMM) Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Damper Motor Module (DMM)

Courtesy of VOLVO CARS OF NORTH AMERICA.

Refer to Verification