Checking the control module for open-circuits

Remove relay 2/118.

Check the driver circuit for the relay coil for an intermittent open-circuit as follows:

Measure the voltage between terminals #1 and #2 on the relay base.

For further information about intermittent open-circuits, see Open-circuit, intermittent faults .

Activate the relay driver for the rear window down: Click on the VCT2000 symbol.

HINT: The voltage between terminals #1 and #2 should be battery voltage. 

If the value deviates excessively, check the voltage between terminal #2 and the battery and between terminal #1 and ground. Both should equal battery voltage. Check for an intermittent open-circuit according to Open-circuit, intermittent faults . Do not forget to check that the power supply to the control module is OK.

Other information 

• See Central electronic module (CEM), replacing

Fig 1: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Relays

Courtesy of VOLVO CARS OF NORTH AMERICA.

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