Check Communication Cable, Power Supply And Ground For ECC Control Module

Check that fuse 31 is intact. If the fuse is blown, check the circuit after the fuse for a short-circuit to ground according to Short-Circuit To Ground, Permanent Faults .

HINT: For further information about the circuit after the fuse, refer to the Service Information Wiring Diagram. 

Then replace the fuse.

Check connector on the ECC control module for contact resistance and oxidation according to Contact Resistance And Oxidation .

Check cable between data link connector (DLC) terminal 7 and ECC control module #A30 for an open-circuit according to Open-Circuit, Permanent Faults .

Check power supply to ECC control module #B5 for open-circuit according to Open-Circuit, Permanent Faults .

Check ground lead between ECC control module #A23 and ground terminal for an open-circuit according to Open-Circuit, Permanent Faults .

Remedy as necessary.

Other information: 

• Connection of breakout box to ECC control module, refer to Connection Of Breakout Box ECC .
• Voltage on communication cable should be approximately 9-11 V with ignition on. If the Volvo Scan Tool (ST) is connected these values do not apply. For other signals, refer to Signal Specification ECC .

Fig 1: Climate Control Module Connectors Terminals

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.

Fig 4: Identifying Data Link Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Continue 

  Refer to Verification