Rear control panel control unit, component description - GF83.40-P-3020RTU

MODEL 251.1 with CODE (581) Comfort automatic air conditioning with CODE (494) USA version with CODE (582) Rear air conditioner with CODE (519) Rear audio system with CODE (872) Electrically heated left and right rear seats up to Model Year 2008

MODEL 164 with CODE (581) Comfort automatic air conditioning with CODE (494) USA version with CODE (582) Rear air conditioner with CODE (519) Rear audio system with CODE (872) Electrically heated left and right rear seats up to Model Year 2008

Fig 1: Identifying Rear Control Panel Control Unit Component

Courtesy of MERCEDES-BENZ USA

Location

The RCP control unit is located next to the 2nd seat row in an extension of the center console.

Design

Left headphones volume control (1)
Increase air volume button (2)
Air volume indicator (3)
Temperature dial (4)
Automatic button (5)
Headroom air distribution button (6)
Right headphones volume control (7)
Right headphones connecting socket (8)
Footwell air distribution button (9)
OFF button (10)
Reduce air volume button (11)
Left headphones connecting socket (12)
Heated seats button, 2nd seat row, left (13)
Heated seats button, 2nd seat row, right (14)

The RCP control unit allows the following actions:

Switching the temperature control ON and OFF
Warm/cold interior temperature selection, separate for left and right
Manual blower control
Manual air distribution
Automatic blower control and air distribution
Headphone volume control, separate for left and right
Heated seats, separate controls for left and right

Discrete inputs:

Circuit 30
Circuit 31
Left audio input
Right audio input

Discrete outputs:

Left headphone connecting socket
Right headphone connecting socket
Left headphone volume control
Right headphone volume control

The RCP control unit is a CAN B bus subscriber.

Operating possibilities

Temperature dial

The required target temperature for the rear compartment can be selected by rotating the temperature dial.

Increase air volume button/Decrease air volume button

The air volume can be selected manually by actuating the appropriate button.

Air volume indicator

The indication is accomplished by illuminating LEDs. The more LEDs illuminate, the greater the air volume flowing into the vehicle interior.

Automatic button

The air volume and air distribution are regulated automatically when the automatic button is pressed. When the automatic mode is activated, the indicator LED comes on.

OFF button

The temperature control in the rear can be switched off completely or switched back on by pressing the OFF button.

Air distribution buttons

The air distribution can be controlled in the individual areas by actuating the corresponding button.

Headphone volume control

The headphone volume that is required by the passenger in the rear can be adjusted by rotating the volume control. The volume can be controlled separately for the right and left.

Heated seats button

The heat output for the relevant side can be regulated in three stages by pressing the heated seats button.

The HS [SIH], seat ventilation and steering wheel heater control unit (N25/7) is notified of the respective button signal via CAN-B by the RCP [HBF] control unit.