Checking Wiring

Check the relay coil driver circuit for an intermittent short-circuit to supply voltage: Take a voltmeter reading between terminal #2 and ground in the relay base for relay 2/120.

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

For more information about short-circuiting to voltage, see:Checking wiring and terminals. Intermittent faults

HINT: Voltage between #2 and ground shall be approx. 0 Volt. 

Other information 

• See Central electronic module (CEM), replacing

Fig 1: Identifying Voltmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Relays

Courtesy of VOLVO CARS OF NORTH AMERICA.

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