Closing trunk lid function - GF80.20-P-2006A

MODELS 215, 220 with CODE (881b) Remote trunk locking (RTL) 

Shown on model 220 

Operating instructions 

The hydraulic  closing of the trunk lid can be controlled using the following switches:

• RTL push-button (S62/26) 
• Remote trunk lid release switch (S20/1s6) 

With the remote trunk lid release switch (S20/1s6)  the trunk lid can be closed from inside the vehicle hydraulically  . In order for this to happen, safety reasons require that the switch be pressed constantly  . As soon as the switch is no longer pressed the trunk lid movement is stopped.

Pressing the switch again will start the trunk lid moving again.

The RTL push-button (S62/26)  can be used to close the trunk lid hydraulically  by pressing it once  . Pressing the RTL push-button (S62/26)  repeatedly will either stop or resume the closing operation.

When the trunk lid is open this is displayed by an illuminated red LED in the remote trunk lid release switch (S20/1s6).

Operating procedure 

Operation of the remote trunk lid release switch (S20/1s6  ) is detected by the left front door control module (N69/1).

The left front door control module (N69/1) sends the message to close the trunk lid over the interior CAN to the pneumatic control module (combined) (A37)  .

Operation of the RTL push-button (S62/26)  is read in directly by the pneumatic control module (combined) (A37).

Once the switch has been pressed the pneumatic control module (combined) (A37) will actuate the two relays

• trunk lid open relay (K69/1)  and
• trunk lid close relay (K69/2) 

and activate the hydraulic pump RTL (M51)  . The hydraulic ram is charged with fluid and closes the trunk lid by means of the multiple-jointed hinge.

With the trunk lid opening angle detection sensor (B24/16)  the pneumatic control module (combined) (A37) controls the hydraulic operation and the limit switch position of the hydraulic pump RTL (M51). When the trunk lid opening angle detection sensor (B24/16) reaches the specified limit stop position, the pneumatic control module (combined) (A37) switches off the hydraulic pump RTL (M51). The limit stop position of the hydraulic pump RTL (M51) is selected such that after the hydraulic is switched off the weight of the trunk lid causes it to fall into the catch.

The complete trunk lid closing procedure is conducted by the power-assisted closing  feature. The power-assisted closing function is activated by the pneumatic control module (combined) (A37), by means of opening the trunk lid closing assist locking eye microswitch's (S88/3)  contact.

Safety mechanism 

The hydraulic trunk lid closing operation is constantly controlled by the pneumatic control module (combined) (A37)  via the trunk lid opening angle detection sensor (B24/16)  . If the trunk lid encounters an obstacle or if a manual intervention takes place, the speed of the trunk lid is momentarily altered. This change in speed is analyzed by the pneumatic control module (combined) (A37). In such an event the pneumatic control module (combined) (A37) stops  the closing operation immediately and opens  the trunk lid again to precisely the position it was at when the closing operation was initiated.

Manual  operation of the trunk lid is possible in an emergency, but necessitates greater physical effort as the hydraulic system also has to be moved. The trunk lid opening angle detection sensor (B24/16) does not require any recalibration after a manual intervention.

	Power-assisted trunk lid close, function		GF80.40-P-3002S
	Trunk lid status indicator, function		GF80.20-P-4015S
	Locking/unlocking trunk lid with mechanical key, function		GF80.20-P-3011S
	Open trunk lid with remote control key, function		GF80.20-P-3010B
	Open trunk lid with interior switch, function		GF80.20-P-3012B
	Manually open trunk lid, function		GF80.20-P-3013B
	Pneumatic system equipment (PSE) control module (combined), position/task/design/function		GF80.20-P-4106S
	Remote trunk locking hydraulic pump, position/task/design		GF80.20-P-4115A
	Trunk lid relay, position/task/design		GF80.20-P-4116A
	Trunk lid opening angle detection sensor, position/task/design/function		GF80.20-P-4113A
	Hydraulic ram, position/task/design		GF80.20-P-4111A
	Gas-filled telescopic struts, position/task		GF80.20-P-4114A
	Trunk lid lock, position/task/design/function		GF80.20-P-4103S