Lock Units Side Doors
The lock units (6/36, 6/55-57) are in the doors and are directly connected to the door control module in the relevant door. There are different versions of the lock units, depending on the configuration of the lock motors.
The lock units in the front doors are available in two versions when keyless function is installed.
- central locking
- central lock, deadlocking (BLL).
There are several versions of the lock units in the rear doors with lock motors for:
- central locking
- deadlocking
- child-proof locks.
The central locking lock motor locks the door.
The deadlock lock motor (BLL) disengages the inner door handle.
Lock motor child-proof locks (same motor as for deadlocking (BLL)) is only available for the rear doors and disconnects the inner door handle.
Door control modules can only activate the lock motors after command from Central electronic module (CEM) or from Keyless vehicle module (KVM).
In addition to the lock motors, the lock units contain up to three contract breakers depending on the configuration:
- switch to indicate that the central locking motor is in its unlocked position
- contact breaker which indicates that the door is not locked
- contact breaker to indicate the child-proof lock motor is locked.
To prevent the lock motors from becoming too hot, there is a protection function in the software in the central electronic module (CEM). The central electronic module (CEM) has a counter that counts a number of steps each time a central locking command is carried out. (The number of steps is determined by several parameters.)
The counter has a maximum value of 240 steps. Normally there are 12-13 activations in a row before the counter reaches the maximum value. The counter counts down by 1 step/second. If the counter has reached the maximum value, the central electronic module (CEM) will not perform commands for locking the central locking. The unlocking command will always be accepted, even if the maximum value has been reached. This means that if the central locking has been activated so many times that the counter has reached its maximum value, it will take about 5 seconds before the next central locking command is performed. The counter is fully restored after 4 minutes.
There is corresponding protection for the power child-proof lock motors