GF80.20-P-0001GZ Tailgate Remote Actuation, Function
GF80.20-P-0001GZ Tailgate Remote Actuation, Function
- with CODE (890) Automatic rear-end door
Rear-end door remote actuation, general
The rear-end door can be opened and closed automatically via the rear-end door actuation feature. Opening and closing is performed via the rear-end door hydraulic pump (M51/1) which is actuated by the rear-end door closing control unit (N121/1).
Manual operation of the rear-end door is possible, but requires increased force, since the hydraulic system also has to be moved.
The rear-end door actuation feature comprises the following subfunctions:
^ Opening angle limitation (garage position)
^ Blockage detection
^ Anti-pinch protection
^ Normalizing
Further partial functions are described in separate documents:
^ Tailgate opening, function
^ Tailgate closing, function
Opening angle limitation (garage position)
The opening angle can be limited by a control menu in the instrument cluster (A1). The garage position can be set as the new end position (maximum opening position) if required to prevent damage to the tailgate from extending transport items (ski box, surfboard, etc.).
Lockup recognition
The rear-end door closing control unit recognizes the status and any change in the speed of the rear-end door with the aid of the rear-end door opening angle recognition sensor (B24/16).
When closing, the tailgate hydraulic pump is reversed and the tailgate is returned to the initial position.
When opening, the tailgate hydraulic pump is switched off and the tailgate remains in the momentary position.
Obstruction protection
The left tailgate closing obstruction sensor strip (B86/1) and right tailgate closing obstruction sensor strip (B86/2) secure on both sides of the tailgate. The obstruction sensor strips are read in and evaluated by the rear-end door closing control unit.
The pinch protection strips can have the following statuses:#
^ Standby
^ Obstruction sensor strip defective
^ Obstruction
If a defective obstruction sensor strip is recognized, an automatic closing operation is interrupted and is not performed.
Synchronizing
Calibration is required for:
^ Initial startup
^ System components replacement
^ Adjustment work on system components
A required normalization is only possible if previously denormalized with STAR DIAGNOSIS (provided that the system has already been normalized previously). Battery disconnection (G1) does not lead to denormalization.
Normalization function sequence
Downstop synchronization:
Completely close rear-end door and keep closed. The lower stop is considered to be normalized if the signal "Rear-end door closed" from the rear-end door locking unit (A72) on the rear-end door closing unit is actuated for min. t = 0.5 s.
To store the upper calibration limit, it is necessary for the opening angle limitation to be switched off in the instrument cluster.
Up-stop synchronization:
Actuate rear-end door open/close switch, driver (S15/3) until the rear-end door is completely opened.
The rear-end door closing control unit enables the rear-end door opening angle recognition sensor to recognize when the rear-end door (lock-up recognition) is completely opened and thereby normalizes the upper stop.
