Locking/Unlocking Central Locking Electrically, Function

Circuit description
All motors are connected to an unlocking relay with one lead and a locking relay with another lead. The relays are changeover switches.
In the non-actuated state, both relays switch both motor connections to ground. The motors are therefore short-circuited when not actuated.

Unlocking
The doors are unlocked in groups. The central locking motors are connected to the relays in groups.
Central locking left front door and fuel filler flap unlocking relay (F1k24):
Left front door central locking motor (M14/6) and fuel filler flap central locking motor (M14/10)
Central locking right front door and rear doors unlocking relay (F1k23):
Right front door central locking motor (M14/5), left rear door central locking motor (M14/8) and right rear door central locking motor (M14/9)
Central locking tailgate unlocking relay (F1k15): Tailgate central locking motor (M14/7)

To electrically unlock a group, the all-activity module (AAM, N10) actuates the corresponding unlocking relay for approx. one second. This relay connects one connection of the connected motors to circuit 30. The other connection remains connected to ground via the locking relay.

Locking
For electrical locking, the all-activity module (AAM, N10) actuates the central locking all doors locking relay (F1k20) for approx. 1 second. This relay connects the corresponding connection of the motors to circuit 30. The other connection remains connected to ground via the unlocking relay.
All doors, the tailgate and tank flap are locked simultaneously.
Open doors cannot be locked due to the mechanical coupling between the rotary catch and lock.


NOTE: The AAM recognizes by means of the central locking microswitches (M14/5s1, M14/6s1, M14/7s1, M14/8s1 and M14/7s1), whether the doors or tailgate have been locked or unlocked properly. If not, the operation is repeated once.