RCP [HBF] control unit, component description as of model year 2009 - GF54.21-P-4510LE

MODEL 221

with CODE (406) Rear multicontour seat

as of model year 2009

/YoM 08

MODEL 221 up to 31.5.09

with CODE (864) Rear entertainment system

as of model year 2009

/YoM 08

Shown up to 31.5.09

Location

The RCP [HBF] control unit is located in the armrest between the rear seats.

Fig 1: Identifying RCP [HBF] Control Unit And DVD Player

Courtesy of MERCEDES-BENZ USA

Shown as of 1.6.09

Fig 2: Identifying RCP [HBF] Control Unit, DVD Player And Rear Handset Holder

Courtesy of MERCEDES-BENZ USA

Location

The RCP [HBF] control unit is located in the armrest between the rear seats.

The RCP [HBF] control unit (N72/2) has the following controls:

With code (864) Rear entertainment system up to 31.5.09:

Right screen button (N72/2s4)
Left screen button (N72/2s5)
Right "Back" button (N72/2s6)
Left "Back" button (N72/2s7)
Rear rotary push button (N72/2s8)
-

With code (406) Rear multicontour seats:

Left seat selection button (N72/2s12)
Right seat selection button (N72/2s13)
Backrest side seat contour button (N72/2s14)
Lumbar support seat contour button (N72/2s15)
Lumbar support height adjustment button (N72/2s16)
Gentle massage function button (N72/2s17)
Firm massage function button (N72/2s18)

Fig 3: Identifying RCP [HBF] Control Unit Buttons Location

Courtesy of MERCEDES-BENZ USA

Task

The RCP [HBF] control unit allows the rear passengers to control comfort-relevant functions in the rear of the vehicle and has the following tasks:

Receive signals
Transmitting signals

Receive signals

The RCP [HBF] control unit receives signals via the following connection:

Telematics CAN (CAN A)

Telematics CAN

The RCP [HBF] control unit communicates with the following components:

COMMAND controller unit (A40/3)
Additionally with code (864) Rear entertainment system:

DVD player
Left rear display (A40/5)
Right rear display (A40/6)

The signals are read in via the telematics CAN. The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).

Transmitting signals

The RCP [HBF] control unit transmits signals via the following connection:

Telematics CAN

Telematics CAN

The signals are sent by the RCP [HBF] control unit via the telematics CAN. The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).

Operation via rear rotary push button up to 31.5.09

Schematic representation

Fig 4: Identifying RCP Control Unit Rotating Directions

Courtesy of MERCEDES-BENZ USA

The rotary movement of the rear rotary push button is picked up in two different spacing resolutions:

12 steps per revolution
32 steps per revolution

The low-resolution spacing (12 steps per revolution) is used for selecting menus.

The high-resolution spacing (32 steps per revolution) is used for selecting and moving within selection lists.

The rotary movement for selecting within a list is limited at the end of the list by a variable end stop, i.e. when the bottom of a selection list is reached, the rear rotary push button can no longer be turned and vice versa.

Movement of rear rotary push button	Movement of cursor
Rotate clockwise	The cursor moves to the right, or downward in vertical menus (exception: slider).
Rotate counterclockwise	The cursor moves to the left, or upward in vertical menus (exception: slider).
Push forward	The cursor moves upward.
Push backward	The cursor moves downward.
Push left	The cursor moves to the left.
Push right	The cursor moves to the right.
Press down vertically	A selected menu or submenu is activated.

Variants

Multicontour seat (with code (406) Rear multicontour seats)
Rear entertainment system (with code (864) Rear entertainment system)
Multicontour seat and rear entertainment system (with code (406) Rear multicontour seats and code (864) Rear entertainment system)

Wiring diagram for rear control panel control unit

PE54.21-P-2125-99SAA