Checking the wiring and component

Check the connector for the air quality sensor (AQS). Check for contact resistance. Check for oxidation. Check for loose connections.

Check that the air quality sensor (AQS) is connected to the power supply and ground.

Measure the voltage at the connector for the air quality sensor (AQS) between terminals #1 and #3.

Check LIN bus 1 by taking a reading between sensor connector terminal #2 and the connector for climate control unit terminal #2. Check for an open-circuit.

Try replacing the sensor 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
• -2001 see Replacing the air quality sensor
• 2002- see Replacing the air quality sensor .
• See Checking wiring and terminals

Fig 2: Connector, Green (16- Pin)

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Air Quality Sensor (AQS)

Courtesy of VOLVO CARS OF NORTH AMERICA.

Refer to Verification