Indication Of The Status Of The Doors, Lock Motors And Hatches

Fig 1: Identifying

Courtesy of VOLVO CARS CORPORATION

There are two or three contact breakers in the lock units in the side doors: 

• contact breaker which indicates if the door is not completely closed
• contact breaker to indicate that the central locking motor is in the locked position
• contact breaker which indicates that the child-proof lock motor is in its locked position (rear doors only).

There are two contact breakers in the tailgate lock unit: 

• switch for indicating that the lock is locked or unlocked (not on XC70 from structure week 201046)
• contact breaker which indicates that the tailgate is closed.

The contact breakers are connected directly to the central electronic module (CEM) from all doors.

Contact breaker for central locking motor indication, and consequently contact breaker for child-proof lock motor, for the rear doors, are connected to their respective rear control module. The rear door control modules transmit the signal on to the relevant control module in the front doors which forward the signal to the central electronic module (CEM).

The signals are used to generate error messages and diagnostic trouble codes (DTCs) if a door is not properly closed when the vehicle is driven or if locking or unlocking of one or more doors has failed one or more times.

There is only one contact breaker in the lock unit in the tailgate. This indicates whether the tailgate is open or closed.