GF80.20-P-2001GZ Tailgate Closing, Function

GF80.20-P-2001GZ Tailgate Closing, Function
- with CODE (890) Automatic rear-end door

Component Identification:

Function requirements, general
^ Circuit 30
^ System synchronized
^ Speed = 0 km/h
^ Spare tire holder open in 90° position (on model 164 with code (849) Spare tire holder/spare tire)

Close rear-end door
The rear-end door function consists of the following functions:
^ Closing rear-end door via RWTS button
^ Closing rear-end door via rear-end door switch
^ Closing rear-end door via transmitter key

During the entire rear-end door closing operation, the rear-end door closing warning buzzer is actuated by the rear-end door closing control unit once each second.
The closed status of the rear-end door is indicated by switching off the LED integrated into the rear-end door switch (up to 31.5.07). On vehicles as of 1.6.07 the LED is eliminated.

Closing rear-end door via RWTS button

Function sequence
The rear-end door closing control unit reads in the actuation of the RWTS button and actuates the rear-end door hydraulic pump. The rear-end door is closed via the hydraulic cylinder and the multiple- joint hinge.
When the rear-end door arrests in the catch on the rear-end door closing unit, the rear-end door closing control unit switches off the rear-end door hydraulic pump.
On model 164.8 the rear-end door hydraulic pump is momentarily actuated (t = 0.5 s) in the opening direction.
The rear-end door closing unit then completely closes the rear-end door with power closing in both cases.

On vehicles with code (889) Keyless Go, the central locking (CL) can also be locked depending on the actuation of the RWTS button.

Closing rear-end door via rear-end door switch

Function sequence
Actuation of the rear-end door switch is read in by the left front door control unit and relayed via CAN-B to the rear-end door closing control unit which actuates the rear-end door hydraulic pump. The rear-end door is closed via the hydraulic cylinder and the multiple-joint hinge.
When the rear-end door arrests in the catch on the rear-end door closing unit, the rear-end door closing control unit switches off the rear-end door hydraulic pump.
On model 164.8 the rear-end door hydraulic pump is momentarily actuated (t = 0.5 s) in the opening direction.
The rear-end door closing unit then completely closes the rear-end door with power closing in both cases.

When the rear-end door switch is actuated again, the closing operation is interrupted.
The rear-end door remains in the current position.
The closing operation can be continued with any control element on the rear-end door remote control.

Closing rear-end door via transmitter key

Function sequence
When the button on the transmitter key is actuated (t > 0.5 s), it transmits a radio signal to the roof antenna module; from there, it is relayed to the rear SAM control unit and stored on the CAN-B bus. The EIS control unit checks the access authorization of the transmitter key. If the transmitter key is recognized as valid, the rear-end door hydraulic pump is actuated by the rear-end door closing control unit. The rear-end door is closed via the hydraulic cylinder and the multiple-joint hinge.
When the rear-end door arrests in the catch on the rear-end door closing unit, the rear-end door closing control unit switches off the rear-end door hydraulic pump..
On model 164.8 the rear-end door hydraulic pump is momentarily actuated (t = 0.5 s) in the opening direction.

The rear-end door closing unit then completely closes the rear-end door with power closing in both cases.

When the button on the transmitter key is actuated again, the closing operation is interrupted.
The rear-end door remains in the current position.
The closing operation can be continued with any control element on the rear-end door remote control.