Checking the control module

Check the relay coil driver circuit for a short-circuit to supply voltage by taking a voltmeter reading at terminal #2 in the relay base.

HINT: The voltage between terminal #2 and ground should be approximately 0 V. 

Fig 2: Identifying Voltage Display

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Relays And Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Replace the control module if the voltmeter displays an incorrect value.

Other information: 

• To access and replace the integrated relay / fusebox in the cargo compartment, see Integrated relay/fusebox cargo compartment/Rear electronic module (REM), replacing
• See Checking wiring and terminals. Permanent fault .

Refer to Verification