Checking the ground lead for the lock button

Check the switch at license plate lighting lamp housing terminal #3 and at lock unit terminal #4. Check the intermediate cable for an open-circuit.

Remedy as necessary.

Other information 

• To expose the lamp housing for the license plate lighting, see Bulb, license plate lighting, replacing
• To access and replace the lock button, see Boot lid handle/switch 
• See Checking wiring and terminals .

Fig 1: Identifying Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.