Control panel for an air conditioner with automatic control and connectors for the air conditioner control unit.
1 - heater fan operation mode switch, 2 - automatic control switch, 3 - control system switch, 4 - windshield blower switch, 5 - rear door glass defroster and side mirror heaters switch, 6 - ventilation mode selection switch, 7 - air conditioner switch, 8 - outdoor temperature display switch, 9 air intake location selection switch, 10 - system switch "AQS" (models with AQS system), 11 - temperature selection switch.
General information
1. The air conditioner control panel adopts touch control switches. A liquid crystal display is used to display information about the system parameters. Rapid or invalid change of system parameters by the user is accompanied by sound signals of the buzzer. Set parameters and status (damper position, etc.) systems are stored in the memory of the control unit after the ignition is turned off.
Note: if the wire was disconnected from the negative terminal of the battery, the system will go to the initial state (to factory settings: automatic control mode with a temperature of 25°C).
2. In automatic mode (AUTO) the required temperature, the rate of its change and the amount of air supplied to the passenger compartment are determined by the value set by the user and the signals from the sensors. To maintain the temperature, automatic control of the temperature controller servo drive, air flow direction selection damper servo drive, air intake mode selection damper servo drive, heater fan electric motor and compressor is used.
- Permissible interval for setting the air temperature in the cabin 17-32°C (In 0.5°C increments)
Heater fan:
- Maximum voltage at level "HI" (AUTO): 10.6 V
- Minimum voltage in automatic mode: 4.5 V
- Minimum voltage in manual control mode: 3.8 V
- Switchover time for speed levels from "LO" before "MAX HI": 6 seconds
Note: if the air conditioning system is in automatic mode (AUTO), then the position "MIX" the air flow direction selection damper is not used and the air flow direction is changed in the following order: "VENT" → "B/L" → "FLOOR" → "VENT".
3. The functioning of the system components is monitored by a self-diagnostic system.
4. On some models, an air quality monitoring system is installed (AQS), which determines the presence of harmful substances and substances with a pungent odor in the air. After the ignition is turned on, the air quality monitoring system will warm up for 34.5±5 seconds. When heated and in case of detection of harmful substances (automatic system operation) air recirculation is turned on.
The principle of operation of the self-diagnosis system
1. Built-in self-diagnosis function of the air conditioning control unit (FATC) determines a malfunction in the electrical circuit and writes a malfunction code for the corresponding system component to the memory of the control unit.
2. If some components fail, the air conditioning system goes into emergency operation (factory settings are used instead of incorrect signals).
Reading trouble codes
1. Turn the ignition key to position "ON".
2. Holding down the switch "AUTO", press the switch "AMV" (outdoor temperature display switch) more than 4 times within 2 seconds.
3. After the LCD display on the air conditioner control panel blinks 3 times at a frequency of 0.5 seconds, the self-diagnosis process will begin.
4. Pressing the switch "AUTO" the LCD will perform another test and display another diagnostic code (if there is a malfunction). When pressed again, the system will return to the previous state.
5. To exit the code reading mode, press the switch "OFF".
Note:
- The two-digit number of the corresponding DTC will flash instead of the set air temperature reading at a frequency of 0.5 seconds and be accompanied by a buzzer.
- If there are two or more fault codes, the codes will be displayed in sequence, and the number of each code will flash on the display twice.
- If the test is performed in a dark place, the sunlight sensor fault code may appear on the display. Try to move the check to a bright place, if after that the fault code does not disappear, then a malfunction in the sunlight sensor circuit is possible.
- To view one of the codes, press the switch "A/C".
Normal condition. | Only one fault code. |
More than two DTCs. |
Table of fault codes for an air conditioner with automatic control.
Emergency operation
1. If the interior air temperature sensor is faulty (open circuit or short circuit), then the air temperature in the cabin is assumed to be 25°C.
2. If the outdoor temperature sensor is defective (open circuit or short circuit), then the outside air temperature is assumed to be 20°C.
3. If the evaporator air temperature sensor is faulty (open circuit or short circuit), then the temperature of the evaporator is assumed to be -2°C.
4. If the evaporator temperature sensor is faulty (open circuit or short circuit), the heated windshield will turn off after 10 minutes.
5. If the temperature controller servo is defective (open circuit or short circuit), then at a temperature of 17°C-24.5°C, the maximum cooling mode is set (MAX COOL), and at a temperature of 25-32°C, the maximum heating mode is set (MAX-HOT).
Removal and installation of the control panel of a heater and the conditioner
The procedures for crushing and installing the heater and air conditioning control panel are given in the chapter "Body".
Sunlight Sensor Test
1. The sensor is installed in the center of the instrument panel next to the windshield heating deflector.
2. The sensor measures the intensity of solar radiation and sends a corresponding signal to the air conditioning control unit. The sensor signal is used to control the fan speed of the heater and control the air temperature. supplied to the salon.
3. Using a portable lamp, change the light intensity of the photocell on the driver and passenger sides. Measure voltage change between pins "1" And "2" sensor.
Checking the outdoor temperature sensor
1. The sensor is installed in front of the radiator of the engine cooling system. The sensor measures the outdoor temperature (outside the cabin) and is an NTC thermistor. The resistance of the sensor increases at low temperatures and decreases at high air temperatures.
2. The sensor signal is used to control the temperature of the air supplied to the cabin, the emergency operation of the sensors, control the temperature regulator damper, control the speed of the heater electric fan, control the mixing of air flows and adjust the relative humidity of the air in the cabin.
3. Disconnect the sensor connectors and use an ohmmeter to check that the resistance at a temperature of 20°C corresponds to the nominal value.
- Rated value: 36.5±2.3 kΩ
Checking the temperature sensor in the cabin
1. The sensor detects the air temperature in the passenger compartment. The sensor signal is used to control the temperature of the air supplied to the passenger compartment, the emergency operation of the sensors, control the temperature regulator damper, control the speed of the heater electric fan and automatic control of the air conditioner.
2. The sensor signal should match the graph below.