Remote trunk lid closing, function - GF80.20-P-0007SX

MODEL 221.0 /1, 216.3 with CODE (881) Remote trunk closing (RTC [HDFS]) up to Model Year 8 

Description 

The remote trunk closing (RTC) makes it possible to open and close the trunk lid hydraulically. The RTC is controlled by the TLC control unit (N121). The trunk lid is driven via a hydraulic cylinder, which is integrated into the trunk lid mechanism. The hydraulic volume flow required for operation is generated by the TLC hydraulic pump (M51). The trunk lid position sensor (B24/16) is integrated into the hydraulic cylinder. The trunk lid is completely closed by the power closing (SVS).

Opening trunk lid 

The trunk lid can be opened with the following controls:

• Transmitter key (A8/1)
• Remote trunk lid open/close switch (S20/1s6)
• Trunk lid external operation switch (S88/8)
• Trunk lid emergency release switch (S88/10) (only )

The trunk lid can be opened to the limit stop or the stored garage position. The opening motion can be stopped at any time by reactuating the controls mentioned above.

Closing trunk lid 

The trunk lid can be closed with the following controls:

• Trunk lid open/close switch
• TLC [HDS] button (S62/26)

The trunk lid open/close switch must be actuated during the entire closing procedure.

When closing via the TLC button, closing can be stopped by actuating the TLC button again.

Limitation of opening position of trunk lid (garage position) 

The limitation of the opening position is intended to prevent the trunk lid from being damaged by extending transportation goods (e.g. ski box) or when the space available is insufficient (e.g. underground garage).

The garage position can be adjusted with the front central operating unit (A40/9) in the menu COMAND control unit (A40/3). The menu is shown in the COMAND display (A40/8).

Synchronizing 

Normalization is performed via STAR DIAGNOSIS in the TLC control unit and must be performed during initial start-up. It is necessary to learn in the closed and completely open position of the trunk lid. Before normalization of the upper end position, it is not possible to close the trunk lid hydraulically.

Since the end points of the trunk lid are not yet known during normalization, the trunk lid approaches the end points with increased speed.

• Synchronizing upper end position, function prerequisites:
  • Trunk lid lock opened and
  • no synchronization present

When the trunk lid external operation switch is actuated, the trunk lid is opened automatically. If the TLC control unit recognizes that the end position is reached within the normalization range adjusted via STAR DIAGNOSIS, the TLC hydraulic unit is actuated another 8 s and this position is stored as 0 position (trunk lid open). Then the TLC hydraulic pump switches off regardless of whether the request is still present.

• Normalization of lower end position Function prerequisites:
  • Trunk lid lock open,
  • upper normalization present and
  • lower normalization not present

An automatic run is started in the closing direction to normalize the lower end position after the TLC button is actuated. The trunk lid is completely closed.

If the trunk lid is within the normalization limits for the closed position at that time and the trunk lid position sensor indicates a plausible value, normalization is completed.

Lockup recognition 

The TLC control unit recognizes the position and the speed of the trunk lid with the aid of the trunk lid position sensor.

• Closing procedure

  If trunk lid lock-up is recognized while closing, the trunk lid is moved to the default position, preceding lock-up.

• Opening procedure

  If trunk lid lock-up is recognized while opening, the drive is switched off and the trunk lid remains in the momentary position.

Remote trunk closing (RTC), location of components	GF80.20-P-0007-02SX
Remote trunk closing (RTC) block diagram	GF80.20-P-0007-04SX
Closing trunk lid, function	GF80.20-P-2006SX
Opening remote trunk closing (RTC), function	GF80.20-P-2010SX