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Home >> Mercedes Benz >> 2007 >> ML320 >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC - 164 Chassis >> Basic Knowledge >> Automatic air conditioning pushbutton control unit, component description - GF83.40-P-3000GZU

Automatic air conditioning pushbutton control unit, component description - GF83.40-P-3000GZU

MODEL 164 with CODE (580) Automatic air conditioning with CODE (494) USA version 

Location 

The AAC control and operating unit is located on the instrument panel.

Fig 1: Identifying Automatic Air Conditioning Pushbutton Control Unit, Component Description
G05260587Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Design 

The AAC control and operating unit contains the following controls and displays:

The AAC control and operating unit allows the following control actuations: 

The AAC control and operating unit takes over control of the following: 

Discreet: 

Via the Control Area Network bus, class B (interior compartment) (CAN B): 

Via Local Interconnect Network (LIN): 

The following sensor signals are read in by the AAC control and operating unit: 

Via CAN B: 

Control possibilities 

Left temperature selector wheel/right temperature selector wheel 

The desired temperature setting for the left and right sides can be set by turning the associated temperature selector wheel.

Air distribution buttons 

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

Increase air volume button /Decrease air volume button 

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

Air volume indicator 

Indication is accomplished by LEDs coming on. The more LEDs illuminated, 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.

IMPORTANT For USA version, code 494, "MAX COOL" is additionally displayed with maximum cooling output.

OFF button 

The automatic air conditioning (AAC) can be switched off completely or switched back on by pressing the OFF button. The main air flap is closed or opened accordingly.

Residual heat button 

The vehicle can be heated or ventilated only for up to 30 min by pressing the residual heat button. The function is only possible with circuit 15 off or circuit 15C on. If there is low voltage, the residual heat function is automatically switched off. The flaps are in automatic mode. The blower operates at a set fixed value. When the residua heat mode is activated, the indicator LED comes on.

AC-OFF button 

Pressing the AC-OFF button switches off the refrigerant compressor. All other functions are retained. When the refrigerant compressor is switched off, the indicator LED comes on.

Rear window heater button 

When a button is pressed, the air conditioning sends a switch-on request via the CAN B bus to the rear SAM control unit; simultaneously, the indicator LED in the rear window heater button is switched on.

Air recirculation switch 

When the air recirculation switch is pressed momentarily (t < 1.5 s), the main air flap is closed to prevent air entering from outside.

The function LED is illuminated during operation. When pressed for a longer period (t > 1.5 s), the convenience open/close window and tilting/sliding roof (SR) (on vehicles with power glass tilting/sliding roof, code 414) function is activated.

IMPORTANT With model 164.8, the left rear and right rear vent windows are actuated at the same time as part of the convenience feature.

Window defrost button 

The temperature is set to "maximum" and the air flow distributed to the defroster and side air outlets. All the other flaps are closed.

The blower is controlled depending on the coolant temperature.

The indicator LED in the defrost button comes on.

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