Indication Of The Status Of The Doors And Hatches

Fig 1: Identifying Communications Network For Indication Of Door And Hatch Status

Courtesy of VOLVO CARS CORPORATION

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

• contact breaker to indicate if the door is ajar (not fully closed)
• contact breaker to indicate that the central locking motor is in the locked position.

The contact breaker which indicates if the door is ajar is directly connected to the central electronic module (CEM) from all doors.

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/trunk lid. This indicates whether the tailgate/trunk lid is open or closed.

For the C70 there is a LED in each door to indicate when the door is locked or unlocked. The LEDs are used instead of the traditional lock buttons on top of the doors. The LEDs flash for a short time after the doors have been locked or unlocked.