Checking Cables

WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.

Check the control module and the damper motor connectors for contact resistance and oxidation according to Contact Resistance And Oxidation .

Check signal cable between MCC control module #B13 and damper motor terminal 3 for an open-circuit according to Open-Circuit, Permanent Faults , and a short-circuit to supply voltage according to Short-Circuit To Supply Voltage. Permanent Faults .

Check ground lead between MCC control module #B11 and damper terminal 1 for an open-circuit according to Open-Circuit, Permanent Faults .

Check cable for power supply between MCC control module #B12 and damper motor terminal 2 for a short-circuit to supply voltage according to Short-Circuit To Supply Voltage. Permanent Faults .

If cables are OK, try a new air distribution damper motor.

Remedy as necessary.

Other information:

To disconnect the control module, see Replacing Or Adjusting Control Cables/Mechanical Rear Section And Control Panel/Front Section (Manual Climate Control/STANDARD) .
To access/replace the air distribution damper motor, refer to Replacing Damper Motor Air Distribution .
To connect the breakout box, see Connection Of Breakout Box MCC .
Voltage on signal cable varies between approximately 0-5 V depending on damper motor position. Damper motor power supply should be approximately 5 V. For other values, see Signal Descriptions MCC .

Fig 1: Identifying 6-Pin Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Connector B

Courtesy of VOLVO CARS OF NORTH AMERICA.

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Refer to Self-Adjusting Of Shutter Motor End Position