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Home >> Mercedes Benz >> 2011 >> SL 65 AMG (230.479) V12-6.0L Turbo (275.981) >> Repair and Diagnosis >> Accessories and Optional Equipment >> Antitheft and Alarm Systems >> Keyless Entry >> Description and Operation >> GF80.20-P-2005RI Open HDF Trunk Lid, Function

GF80.20-P-2005RI Open HDF Trunk Lid, Function



GF80.20-P-2005RI Open HDF Trunk Lid, Function
- with CODE (881) Remote trunk closing (RTC [HDFS])


Function requirements, general
^ No overvoltage or undervoltage
^ Vario roof in locked end position (open or closed)
^ Vehicle stationary

Remote trunk lid opening, general
The remote trunk opening function allows the trunk lid to be opened hydraulically.

The remote trunk opening function comprises the following partial functions:
^ Function sequence for opening trunk with transmitter key (A8/1)
^ Function sequence for opening trunk lid with driver-side trunk lid open/close switch (S15/3)
^ Function sequence for opening trunk lid with trunk lid external operation switch (S88/8)
^ Function sequence for opening trunk lid with Trunk lid emergency release (S88/10) (with code (494) USA version)
^ Function sequence for hydraulic actuation

Function sequence for opening trunk with transmitter key
If the button "remote trunk lid opening" is pressed for min. t = 0.5 s, the transmitter key sends a radio signal to the right antenna amplifier module (A2/65). The overhead control panel control unit (N70) transmits this signal to the EIS control unit via interior CAN (N73). The EIS control unit checks the access authorization of the transmitter key.
If the access is valid, the EIS control unit transmits the command "Open trunk lid" to the pneumatic controller unit with combined functions (A37) and RVC control unit (N52)via the interior CAN. The trunk lid is unlocked pneumatically by the pneumatic controller unit via the CL remote trunk lid opening valve(Y65/3). Unlocking is recognized via the locking pawl rotary tumbler switch (S88/4) by the rear SAM control unit (N10/8). It transmits the signal "Trunk lid unlocked" to the RVC control unit and pneumatic control unit via the interior CAN.

The RVC control unit then actuates the RVC hydraulic unit (A7/5) to open the trunk lid. The RVC control unit monitors the opening procedure for the trunk lid via the trunk lid position sensor (B24/16).
If the button "Remote open trunk lid" is actuated again during the opening procedure, or another control for opening or closing the trunk lid is actuated, the automatic drive is immediately stopped. When the "Remote trunk opening" button is actuated again, opening is continued.

Additional function requirements for opening for trunk lid with driver-side trunk lid open/close switch
^ Unlocked vehicle

Function sequence for opening driver-side trunk lid open/ close switch
Actuation of the driver-side trunk lid open/close switch is read in by the left door control unit (N69/1) and transmitted to the pneumatic controller unit and the RVC control unit via the interior CAN. The trunk lid is unlocked pneumatically by the pneumatic controller unit via the remote trunk opening valve. Unlocking is recognized by the rear SAM control unit via the pawl rotary tumbler switch.

It transmits the signal "Trunk lid unlocked" to the RVC control unit and pneumatic controller unit via interior CAN. The RVC control unit then actuates the RVC control unit to open the trunk lid. The RVC control unit monitors the opening procedure of the trunk lid via the trunk lid position sensor. When the trunk lid is open, the status indicator in the driver-side trunk lid open/close switch comes on.
When the trunk lid open/close switch, driver is actuated again, the remote trunk lid opening is stopped.

Additional function requirements for opening trunk lid with trunk lid external operation switch
^ Unlocked vehicle

Function sequence for opening trunk lid with trunk lid external operation switch
Actuation of the trunk lid external operation switch is read in by the pneumatic controller unit and is transmitted to the RVC control unit via interior CAN. The trunk lid is unlocked pneumatically by the pneumatic controller unit via the remote trunk opening CL valve. Unlocking is recognized by the rear SAM control unit via the pawl rotary tumbler switch.

It transmits the signal "Trunk lid unlocked" to the RVC control unit and pneumatic controller unit via interior CAN.
The RVC control unit then actuates the RVC control unit to open the trunk lid. The RVC control unit monitors the opening procedure of the trunk lid via the trunk lid position sensor.
When the trunk lid external operation switch is actuated again, automatic opening is stopped; actuating again continues the opening procedure.

Function sequence for opening trunk lid with trunk lid emergency release
When the trunk lid emergency release switch is actuated and starts the opening procedure, the pneumatic controller unit unlocks the trunk lid via the remote trunk lid opening valve. Unlocking is recognized by the rear SAM control unit via the pawl rotary tumbler switch. It transmits the signal "Trunk lid unlocked" to the RVC control unit and pneumatic controller unit via interior CAN.
The RVC control unit then actuates the RVC control unit to open the trunk lid. The RVC control unit monitors the opening procedure of the trunk lid via the trunk lid position sensor.

The trunk lid emergency release switch opens the trunk regardless of the vehicle speed and the status of the trunk lid locking switch (S134) (with code (887) Valet Parking).

Function sequence for hydraulic actuation
The RVC control unit actuates the RVC hydraulic unit to open the trunk lid. The RVC hydraulic unit contains the RTC proportioning valve (A7/5y3). The hydraulic volume flow is transmitted to the distribution block via the RTC proportioning valve. The distribution block distributes the hydraulic volume to the hydraulic cylinder.





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