Checking the component and wiring

Check the signal cable between the climate control module (CCM) and the evaporator temperature sensor. Check for a short-circuit to supply voltage.

Take a reading on the connector for the climate control module (CCM) between terminals #5 (#29) and #16 (#40).

Check the ground lead between the climate control module (CCM) and the evaporator temperature sensor. Check for a short-circuit to supply voltage.

Take a reading on the connector for the climate control module (CCM) between terminals #13 (#37) and #16 (#40).

The voltage must be approximately 0 V.

Check the signal and ground cables between the climate control module (CCM) and the evaporator temperature sensor. Check for an open-circuit.

Take a reading between terminals #5 (#29) and #13 (#37) on the connector for the climate control module (CCM).

The resistance must correspond to the resistance for the evaporator temperature sensor.

Check the connectors for contact resistance and oxidation.

Check that the climate control module (CCM) is receiving a correct value from the evaporator temperature sensor by measuring its resistance and comparing with the values in the table.

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 Checking wiring and terminals
• See Component resistance values

Fig 2: Connector, Green (16- Pin)

Courtesy of VOLVO CARS OF NORTH AMERICA.

Refer to Verification