Air Conditioning (Diagnostics - Introduction): Overview Lexus GS III рестайлинг

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1. NOTICE FOR INITIALIZATION NOTE: When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected. System Name See procedure Intuitive Parking Assist System Refer to «INITIALIZATION»(ref-386951-S21829001392011022400000) Theft Deterrent System Variable Gear Ratio Steering System
2. NOTICES FOR HYBRID SYSTEM ACTIVATION When the warning light is illuminated or the battery has been disconnected and reconnected, pressing the power switch may not start the system on the first try. If so, press the power switch again. With the power switch ON (IG), disconnect the battery. If the key is not in the vehicle interior during reconnection, DTC B2799 may be output.
3. BECAUSE COMPRESSOR HAS HIGH-VOLTAGE CIRCUIT, WEAR INSULATED GLOVES AND PULL OUT SERVICE PLUG TO CUT HIGH-VOLTAGE CIRCUIT BEFORE INSPECTION
4. DO NOT HANDLE REFRIGERANT IN AN ENCLOSED AREA OR NEAR AN OPEN FLAME
5. ALWAYS WEAR EYE PROTECTION
6. BE CAREFUL NOT TO GET LIQUID REFRIGERANT IN YOUR EYES OR ON YOUR SKIN If liquid refrigerant gets in your eyes or on your skin: Wash the area with lots of cold water. WARNING: Do not rub your eyes or skin. Apply clean petroleum jelly to the skin. Go immediately to a hospital or see a physician for professional treatment.
7. NEVER HEAT CONTAINER OR EXPOSE IT TO NAKED FLAME
8. BE CAREFUL NOT TO DROP CONTAINER OR APPLY PHYSICAL SHOCKS TO IT
9. DO NOT OPERATE COMPRESSOR WITHOUT ENOUGH REFRIGERANT IN REFRIGERANT SYSTEM If there is not enough refrigerant in the refrigerant system, oil lubrication will be insufficient and compressor burnout may occur. Necessary care should be taken to avoid this.
10. DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE WHILE COMPRESSOR IS OPERATING Open and close only the low pressure valve. If the high pressure valves are opened, refrigerant flows in the reverse direction causing the charging cylinder to rupture.
11. BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH REFRIGERANT If refrigerant is overcharged, it causes problems such as insufficient cooling, poor fuel economy, engine overheating, etc.
12. PRECAUTIONS TO BE OBSERVED WHILE SERVICING WARNING: Wear insulated gloves and pull out the service plug clip before inspection, as some of the procedures require disconnecting the high-voltage connectors. NOTE: For the electric inverter compressor, use the ND-OIL 11. Electrical insulation performance may decrease significantly if even a small amount of oil other than ND-OIL 11 is used or enters the refrigeration cycle, causing a DTC to be output. Replace the main components (evaporator, condenser, and compressor) if a large amount of oil other than ND-OIL 11 enters the system. Failing to do so may cause electrical insulation performance to remain low, causing a DTC to be output.

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INPUT SIGNAL TO A/C AMPLIFIER

OUTPUT SIGNAL TO A/C AMPLIFIER

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1. GENERAL The air conditioning system has the following features: An ES27 type electric inverter compressor is used on the vehicle. This compressor is driven by the alternating current that is supplied by the A/C inverter, which is integrated with the compressor. As a result, the air conditioning system is actuated without depending on the operation of the engine, thus realizing a comfortable air conditioning system and low fuel consumption. A compact, lightweight, and highly efficient electrical water pump is used in order to ensure the proper heater performance while the engine is stopped. The left/right independent temperature control and neural network control allows the air conditioner to be set to suit the preferences of the persons in the driver seat and passenger seat. An automatic air conditioner is standard in all models. A compact, lightweight, and highly efficient straight flow (full-path flow) aluminum heater core is used. A revolutionary slim structure evaporator is used. The room temperature sensor has a humidity sensor function in order to optimize the amount of dehumidification during the operation of the air conditioning system. The clean air filter has a pollen reduction function. The A/C amplifier is equipped with a self-diagnosis function. If there is a malfunction in the system, it stores the DTCs (Diagnostic Trouble Codes) in its memory. In compliance with the temperature set with the temperature control switch, the A/C amplifier calculates the outlet temperature based on the input signals from various sensors. In addition, corrections in accordance with the signals from the room humidity sensor and the water temperature sensor are added to control the outlet air temperature. Controls the blower motor in accordance with the airflow volume that has been calculated by A/C amplifier based on the input signals from various sensors. Automatically changes the outlets in accordance with the outlet mode ratio that has been calculated by the A/C amplifier based on the input signals from various sensors.
2. MODEL POSITION AND DAMPER OPERATION Control Damper Control Position Damper Position Operation Air Inlet Control Damper FRESH A Brings in fresh air. RECIRC B Recirculates internal air. Air Mix Control Damper (Left / Right Independent Control) Driver and Front Passenger Side MAX COOL to MAX HOT (TEMP. SETTING 18 to 32°C (65 to 85°F)) C, D, E Varies mixture ratio of fresh air and recirculation air in order to regulate temperature continuously from HOT to COOL. Cool Air Bypass Control Damper Driver and Front Passenger Side MAX COOL to MAX HOT (TEMP. SETTING 18 to 32°C (65 to 85°F)) V, W Cool air blows out of front center register, rear center register, in order to adjust temperature around head of occupants during cooling or warming. Mode Control Damper Driver and Front Passenger Side FACE I, J, L, P, U Air blows out of front and rear center registers, and side registers.*1 BI - LEVEL I, Q, M, R, T Air mainly blows out of front and rear center registers, side registers, and footwell register ducts. FOOT H, K, N, O, S Air mainly blows out of front and rear footwell register ducts. In addition, air blows out slightly from front and side defrosters, and side registers.*2 FOOT / DEF G, K, N, O, T Air mainly blows out of front and side defrosters to defrost windshield. Air also blows out from front and rear footwell register ducts, and side registers.*2 DEF F, K, N, O, U Air blows out of front and side defrosters and side registers to defrost windshield. HINT: *1: In the multi mode, air blows out of all the air outlets except the front and side defroster. *2: In the multi mode, air blows out of all the air outlets.
3. AIR OUTLETS AND AIRFLOW VOLUME Air Outlet Mode Selectable Mode Register Driver Passenger Rear Automatic Manual Center Side Center Side Center FACE U FACE L B/L U B/L L FOOT (DEF=0) FOOT D FOOT R FOOT F F/D DEF - - - - - Air Outlet Position Symbol A B C D E Air Outlet Mode Footwell Defroster Driver Passenger Driver Passenger Front Rear Front Rear Front Side Front Side FACE U - - - - - - - - FACE L - - - - B/L U - - - - B/L L - - - - FOOT (DEF=0) - - - - FOOT D FOOT R FOOT F F/D DEF - - - - Air Outlet Position Symbol F G H I J K L M HINT: The size of the circle indicates the proportion of airflow volume. There are 4 sizes.
4. COMPRESSOR Along with the installation of the hybrid unit on the vehicle, an ES27 electric inverter compressor that is driven by a built-in DC motor is used. The basic construction and operation of this compressor are the same as an ordinary scroll compressor, except that it is driven by an electric motor. The A/C inverter has been integrated with the compressor. The electric motor is actuated by the alternating current power (288 V) supplied by the A/C inverter. As a result, the air conditioner control system on the vehicle is actuated without depending on the operation of the engine, thus realizing a comfortable air conditioning system and low fuel consumption. Due to the use of an electric inverter compressor, the compressor speed can be controlled at the required speed calculated by the A/C amplifier. Thus, the cooling and dehumidification performance and power consumption have been optimized. Low-moisture permeation hoses are used for the suction and discharge hoses at the compressor in order to minimize the entry of moisture into the refrigeration cycle. The compressor uses high-voltage alternating current. If a short or open circuit occurs in the compressor wiring harness, the hybrid vehicle control ECU will cut off the A/C inverter circuit in order to stop the power supply to the compressor. Service Tip In order to ensure proper insulation of the internal high-voltage portion of the compressor and the compressor housing, use ND-OIL 11 compressor oil (which has a high level of insulation performance) in the vehicle. Never use a compressor oil other than ND-OIL 11. The electric inverter compressor consists of a spirally wound fixed scroll and variable scroll that form a pair, a brushless motor, an oil separator, a motor shaft and A/C inverter. The fixed scroll is integrated with the housing. Because the rotation of the shaft causes the variable scroll to remove while maintaining the same posture, the volume of the space that is partitioned by both scrolls varies to perform the suction, compression, and the discharge of the refrigerant gas. Locating the suction port directly above the scrolls enables direct suction, thus realizing suction efficiency. Containing a built-in oil separator, this compressor is able to separate the compressor oil that is intermixed with the refrigerant and circulates in the refrigeration cycle, thus realizing an efficient in the oil circulation rate. This inverter converts the HV battery's nominal voltage of DC 288 V into AC 288 V and supplies power to operate the compressor. System Diagram: The A/C amplifier calculates the target compressor speed based on the target evaporator temperature (calculated from the room temperature sensor, humidity sensor, ambient temperature sensor, and solar sensor (automatic light control sensor)) and the actual evaporator temperature detected by the evaporator temperature sensor. Then, the A/C amplifier transmits the target speed to the hybrid vehicle control ECU controls the A/C inverter based on the target speed data in order to control the compressor to a speed that suits the operating condition of the air conditioning system. The A/C amplifier calculates the target evaporator temperature, which includes corrections based on the vehicle interior humidity (which is obtained from the humidity sensor) and the windshield glass inner surface humidity (which is calculated from the humidity sensor, solar sensor (automatic light control sensor), room temperature sensor, mode damper position, and wiper operation condition). Accordingly, the A/C amplifier controls the compressor speed to an extent that does not inhibit the proper cooling performance or defogging performance. As a result, comfort and low fuel consumption can be realized.