Checking Cables, Blower Fan Does Not Start

Check the ECC control module, blower fan power unit connectors for Contact Resistance And Oxidation . Check that connectors are connected correctly.

Check signal cable between ECC control module #A15 and power unit #A1 for an open-circuit according to Open-circuit, Permanent Faults and a short-circuit to ground according to Short-Circuit To Ground, Permanent Faults .

Check signal cable between ECC control module #A5 and power unit #A3 for an open-circuit according to Open-Circuit, Permanent Faults and a short-circuit to ground according to Short-Circuit To Ground, Permanent Faults .

Check power supply to blower fan for an open-circuit according to Open-Circuit, Permanent Faults .

Check ground lead between blower fan and power unit for an open-circuit according to Open-Circuit, Permanent Faults .

If cables are OK, try a new power unit.

Remedy as necessary.

Other information: 

• To access/replace the control module, refer to Replacing ECC Control Module .
• To access/replace the power unit, refer to Replacing the Power Unit (Electronic Climate Control) .
• To access/replace the blower fan, refer to Replacing Blower Fan Motor .
• To connect the breakout box, see Connection Of Breakout Box ECC .
• For information on signals, refer to Signal Specification ECC .

Fig 1: Identifying 4-Pin Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Climate Control Module Connectors Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

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  Refer to Verification