Checking the control module for open-circuits

Remove relay 2/120.

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

Measure the voltage between the points #1 and #2 in the relay socket. For more information about open circuits, see:Checking wiring and terminals. Permanent fault

Activate the relay with the switch child safety lock, for windows rear doors, on the driver's control panel (activated relay LED on).

HINT: Voltage between #1 and #2 shall be battery voltage. 

If the value deviates significantly, check voltage between #2 and battery voltage as well as between #1 and ground. Both shall be equal to battery voltage. Check for open circuits according to:Checking wiring and terminals. Permanent fault

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 Voltage Display

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Relays

Courtesy of VOLVO CARS OF NORTH AMERICA.

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  Refer to Information