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Home >> Mercedes Benz >> 2008 >> GL320 4WD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC - 164 Chassis >> Basic Knowledge >> Rear control panel control unit, component description - GF83.40-P-3020 >> Rear control panel control unit, component description - GF83.40-P-3020GZK

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

MODEL 164 with CODE (581) Comfort automatic air conditioning with CODE (519) Rear audio system with CODE (494) USA version 

Location 

The RCP [HBF] control unit is located in the extension of the center console near the 2nd seat row.

Fig 1: Identifying Rear Control Panel Control Unit, Component Description - Model 164 With Code (581)
G05260591Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Design 

With the RCP [HBF] control unit it is possible to operate the following: 

Discrete inputs: 

Discrete outputs: 

IMPORTANT The RCP [HBF] control unit is a participant of the CAN-B.

Control options 

Temperature adjusting ring 

The desired specified temperature for the rear compartment can be set by turning the temperature adjusting ring.

Button for increasing the air flow/button for decreasing the air flow 

The air flow can be selected manually by pressing the particular button.

Air volume display 

The display is by means of particular LEDs that are coming on.

The more LEDs are illuminated, the higher the air volume routed into the vehicle interior.

Automatic button 

The air volume and the air distribution are controlled automatically when the Automatic button has been pressed. When the automatic mode is activated, the function LED comes on.

OFF button 

When the OFF button is pressed, the temperature control in the rear is switched off completely and on again. The rear shutoff flap is closed or opened accordingly.

Air distribution buttons 

The air distribution into the individual areas can be controlled by pressing the particular button.

Headphones volume control 

When the volume control is turned, the volume of the headphones can be selected based on the needs of the rear passenger. The volume can be regulated separately for left and right.