300CE (124.051) L6-3.0L (104.980) (1990)
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Seat Belt Extension: Description and Operation
A10
Left seat belt extender
A10m1
Seat belt extender motor
A10s1
Extender arm retracted switch
A10s2
Extender arm extended switch
A10s3
Force limit switch
A10x1
Plug connection, left seat belt extender
A11
Right seat belt extender
A11m1
Seat belt extender motor
A11s1
Extender arm retracted switch
A11s2
Extender arm extended switch
A11s3
Force limit switch
N42
Seat belt extender control unit
S17/3
Front left door contact switch
S17/4
Front right door contact switch
S68/1
Front left seat belt buckle/seat belt extender warning switch
S68/1x1
Plug connection, front left seat belt buckle/seat belt extender warning switch
S68/2
Front right seat belt buckle/seat belt extender warning switch
S68/2x1
Plug connection, front right seat belt buckle/seat belt extender warning switch
In contrast to the seat belt extenders in model 124.061, the seat belt extenders in models 124.043/050/051 have only one central control unit.
Automatic activation of the seat belt extenders is accomplished when the following four conditions are fulfilled:
1. Belt tongue not inserted into belt buckle (signal from belt buckle switch).
2. The door must be closed (signal from door contact switch).
3. The ignition/starter switch must be turned to position 1 or 2 (terminal 15R or 15)
4. The door open/closed signal for the affected side must be set
The so-called open/closed signal for the affected side is set (in control unit memory) when the affected doors are moved from the open to the closed
position. This signal is set regardless of the ignition key position, elapsed time and whether the belt tongue is inserted into the belt buckle. The door
open/closed signal is reset 60 min. after the last change in the door contact or the ignition/starter switch. This time limitation reduces the number of
so-called ghost functions, i.e. unnecessary extension of the seat belt extender when the front seat is not occupied.
