Open trunk lid with interior switch function - GF80.20-P-3012B

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

Shown on model 220

Fig 1: Identifying Remote Trunk Lid Release Switch - Shown On Model 220

Operating instructions

With the remote trunk lid locking switch (S20/1s6) the trunk lid can be opened from inside the vehicle hydraulically .

For this purpose the switch must be operated for at least 0.5s.

Operating it again serves to interrupt or continue the hydraulic trunk lid release function.

Function requirements

Operation of the remote trunk lid release switch (S20/1s6) is then possible only when:

the vehicle is at rest and
has been unlocked with the transmitter key (A8/1) or
if after unlocking it with the transmitter key (A8/1) the transmitter key (A8/1) is inserted into the EIS control module (N73).

In such cases the left front door control module (N69/1) receives a corresponding CAN message whereby the remote trunk lid release switch (S20/1s6) is activated.

As of 06/00: opening angle limitation : If the remote trunk lid release switch (S20/s16) is operated continuously for 5 seconds when the trunk lid is closed, the opening angle limitation is activated - and is deactivated if the remote trunk lid release switch (S20/s16) is operated for another 5 seconds.

When the function is active, the trunk lid opens as far as the defined position.

Operating procedure

Operation of the remote trunk lid release switch (S20/1s6) is read in by the left front door control module (N69/1). If the function of the switch has been enabled, the left front door control module (N69/1) sends a command to open the trunk lid over the CAN to the pneumatic control module (combined) (A37) .

The pneumatic control module (combined) (A37) then activates the following functions immediately after each other:

An increase in excess pressure in the rear lock's pneumatic cylinder to release the trunk lid.
Activation of the hydraulic pump RTL (M51)

The hydraulic pump RTL (M51) then charges the hydraulic ram with fluid and thus opens the trunk lid by way of the multiple-jointed hinge to its limit position.

When the trunk lid reaches the end position the trunk lid opening angle detection sensor (B24/16) registers this and informs the pneumatic control module (combined) (A37).

If during the opening operation the remote trunk lid release switch (S20/1s6) or the trunk lid release switch (S15/1) is operated, the trunk lid stops in the position at that time.

Safety mechanism

With the aid of the trunk lid opening angle detection sensor (B24/16) the pneumatic control module (combined) (A37) can also initiate an emergency-stop function . In the event that the trunk lid encounters an obstacle, or a manual intervention takes place on the trunk lid, the trunk lid opening angle detection sensor (B24/16) registers a change in speed of the trunk lid.

The pneumatic control module (combined) (A37) then immediately switches off the hydraulic pump RTL (M51). The trunk lid is then held at the position that it was in.

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.

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

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	Trunk lid status indicator, function		GF80.20-P-4015S
	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