Rear Passenger Compartment Backrest Release Function - GF91.29-P-0014FR
Model 290 up to Model year 2021 with code 287 (Through-loading feature)
Function requirements, general
- Vehicle not locked from outside using central locking system or at least one door open or liftgate open
- Vehicle speed below 12 km/h
The electronic ignition lock control unit sends the status of the central locking system over the interior CAN to the rear SAM control unit.
The front door control units and rear door control units send the respective door status via interior CAN to the rear SAM control unit.
The status of the liftgate is detected by the rear SAM control unit.
The instrument cluster sends the vehicle speed via user interface CAN, electronic ignition lock control unit and interior CAN to the rear SAM control unit.
Rear backrest release, general
In order to increase the loading volume of the vehicle, the split backrest in the rear can be unlocked electrically and then folded over towards the front.
Function sequence for rear backrest release
Left backrest:
The left seat backrest is unlocked by pressing the left trunk rear passenger compartment seat backrest release button.
The rear SAM control unit reads in the status of the seat backrest release button directly and the actuates left rear head restraint release actuator. The head restraint is lowered. After 500 ms, the rear SAM control unit actuates the left rear backrest release actuator. The backrest is released and folded over towards the front by means of manual spring force.
The center backrest in the rear is mechanically coupled to the left backrest. As a result, it is always released and folded over together with the left backrest.
Right backrest:
The right seat backrest is unlocked by pressing the left trunk rear passenger compartment seat backrest release button.
The rear SAM control unit reads in the status of the seat backrest release button directly and the actuates right rear head restraint release actuator. The head restraint is lowered. After 500 ms, the rear SAM control unit actuates the right rear backrest release actuator. The backrest is released and folded over towards the front by means of manual spring force.
If a backrest has been released but not folded over, a message is issued by the instrument cluster. The rear SAM control unit reads in the status of the rear backrest inclination switch and the status of the rear backrest lock switch directly and then transmits the status of the respective backrest via interior CAN, electronic ignition lock control unit and user interface CAN to the instrument cluster.
Model 290
up to Model year 2021
with code 275 (Memory Package (driver's seat, steering column and mirror))
with code 287 (Through-loading feature)
Collision avoidance:
If, when folding down the respective seat backrest in the rear passenger compartment, there is a risk of collision with the driver's seat or front passenger seat, the respective front seat is moved forward or up depending on requirements and the seat backrest is uprighted.
| Electrical function schematic for rear passenger compartment backrest release | PE91.29-P-2060-97XBA | ||
| Overview of system components for electric seats | GF91.29-P-9992FR |