Air Conditioning: Overview Toyota Avalon XX30

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1. INITIALIZATION NOTE: When disconnecting the negative (-) battery terminal, initialize the following system after the terminal is reconnected. SYSTEM NAME REFERENCE System Name See Procedure Power Window Control See «INITIALIZATION»(ref-245121-S10087552442006102400000) Sliding Roof System Perform the RESET MEMORY (AT initialization) when replacing the automatic transaxle assembly, engine assembly or ECM (See «INITIALIZATION»(ref-245136-S09604852982006102400000) ). Perform the REGISTRATION (VIN registration) when replacing the ECM (See «BASIC INSPECTION»(/toyota/avalon/xx30-2005-2007/remont/testing-diagnostics/#engine-control-system) ). HINT: Initialization can not be completed by only removing the battery.
2. FOR USING INTELLIGENT TESTER CAUTION: Observe the following items for safety reasons: Read its instruction books before using the tester. Prevent the tester cable from being caught on the pedals, shift lever and steering wheel when driving with the tester connected to the vehicle. When driving the vehicle for testing purposes using the tester, two persons are required. One is for driving the vehicle, and the other operates the tester.
3. EXPRESSIONS OF IGNITION SWITCH The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this article. IGNITION SWITCH POSITION AND ENGINE SWITCH CONDITION Switch Type Ignition Switch (position) Engine Switch (condition) Expression Ignition Switch off LOCK Off Ignition Switch on (IG) ON On (IG) Ignition Switch on (ACC) ACC On (ACC) Engine Start START Start
4. FOR USING BATTERY DURING INSPECTION While using the battery during inspection, do not bring the positive and negative tester probes too close to each other as a short circuit may occur.
5. DO NOT HANDLE REFRIGERANT IN AN ENCLOSED AREA OR NEAR NAKED FLAME Do not handle the refrigerant in an enclosed area or near naked flame.
6. ALWAYS WEAR EYE PROTECTION
7. 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 cool water. CAUTION: Do not rub your eyes or skin. Apply clean petroleum jelly to the skin. Go immediately to a physician or hospital for professional treatment.
8. NEVER HEAT THE CONTAINER OR EXPOSE IT TO NAKED FLAME
9. BE CAREFUL NOT TO DROP THE CONTAINER OR APPLY PHYSICAL SHOCKS TO IT
10. DO NOT OPERATE THE COMPRESSOR WITHOUT ENOUGH REFRIGERANT IN THE 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.
11. DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE WHILE COMPRESSOR IS OPERATING If the high pressure valves are opened, refrigerant flows in the reverse direction and could cause the charging cylinder to rupture. Open and close only the low pressure valve.
12. 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.
13. DO NOT OPERATE ENGINE AND COMPRESSOR WITH NO REFRIGERANT CAUTION: Doing so may damage the inside of the compressor because the compressor parts always move regardless of whether the A/C system is turned on or off.
14. SUPPLEMENTAL RESTRAINT SYSTEM (SRS) This vehicle is equipped with an SRS (Supplemental Restraint system) such as the driver, front passenger, side, curtain shield sir bags etc.. Failure to carry out service operation in the correct sequence could cause the SRS to unexpectedly deploy during servicing, possibly leading to a serious accident. Before servicing (including removal or installation of parts, inspection or replacement), be sure to read the precautionary notices (See «PRECAUTION»(/toyota/avalon/xx30-2005-2007/remont/airbag/#supplemental-restraint-system) ).

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1. SYSTEM DIAGRAM TRANSMITTER RECEIVER LINE SIGNAL Transmitter Receiver Line Signal A/C Amplifier ECM BEAN / CAN Heater Relay Control Signal Magnetic Clutch Control Signal Rear DEF Relay Control Signal Idle Up Signal Pressure Sensor Signal External Variable Control Solenoid Current Signal A/C Amplifier Multiplex Network Body ECU BEAN Diagnostic Tool Response Diagnostic Data A/C Amplifier Accessory Meter Assembly BEAN / CAN-LAN Indicator ON demand signal ECM A/C Amplifier BEAN / CAN Engine Speed (500ms) Engine Coolant Temperature A/C Control Cut Signal Front Controller A/C Amplifier BEAN Outside Temperature Data Multiplex Network Body ECU A/C Amplifier BEAN Diagnostic Tool Request Signal Diagnostic Erase Signal Combination Meter Assembly A/C Amplifier BEAN Vehicle Speed Signal

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1. GENERAL The air conditioning system has the following control. CONTROL OUTLINE DESCRIPTION Control Outline Neural Network Control This control is capable of effecting complex control by artificially simulating the information processing method of nervous system of living organisms in order to establish a complex input / output relationship that is similar to a human brain. Outlet Air Temperature Control In compliance with the temperature set at the temperature control switch, the neural network control calculates the outlet temperature based on the input signals from various sensors. The temperature setting for the driver and front passenger is controlled independently in order to provide a separate vehicle interior temperature for the right and left side. Thus, air conditioning that accommodates the occupants' preferences has been realized. Blower control Controls the blower motor in accordance with ten airflow volume that has been calculated by the neural network control based on the input signals from various sensors. Air Outlet Control Automatically switches the outlets in accordance with the airflow volume that has been calculated by the neural network control based on the input signals from various sensors. In accordance with the engine coolant temperature, outside air temperature, amount of sunlight, required blower outlet temperature, and vehicle speed conditions, this control automatically switches the blower outlet to the FOO / DEF mode to prevent window from becoming fogged when the outside air temperature is low. Air Inlet Control automatically controls the air inlet control damper in accordance with the calculation of the required outlet air temperature. Drives the servomotor (for air inlet) according to the operation of the air inlet control switch and fixes the dampers in the FRESH or RECIRC position. Compressor Control This control turns OFF the magnetic clutch of the A/C compressor when the blower motor is turned OFF at the time, the engine coolant temperature is below a predetermined value, an abnormal refrigerant pressure has been input, or the discharge temperature of the evaporator is below a predetermined value. Air Conditioning ECU turns the compressor off if the engine coolant temperature becomes abnormally hot (115°C (239°F) or above) when driving under a high load. Rear Window Defogger Control Switches the rear defogger and outside rear mirror heaters (1) , on for 15 minutes when the rear defogger switch is switched on. Switches them off if the switch is pressed while they are operating. Outer Temperature Indicator Control Based on the signals from the ambient temperature sensor, this control calculates the outside temperature, witch is then corrected in Air Conditioning ECU, and show in the multi information display (2) / multi display (3) . Self- Diagnosis The DTC (Diagnostic Trouble Code) is stored in the memory when the air Conditioning ECU detects an abnormality in the air conditioning system. (1) Models with XLS and Limited Grades (2) Models without Multi Display (3) Models with Multi Display
2. MODE POSITION AND DAMPER OPERATION Function of Main Damper FUNCTION OF MAIN DAMPER Control Damper Operation Position Damper Position Operation Air Inlet Control Damper FRESH A Brings in fresh air. RECIRCULATION B Recirculates internal air. Air Mix Control Damper MAX COLD to MAX HOT Temp. Setting C - D - E (C' - D' - E') T - U - V Varies the mixture ratio of the fresh air and the recirculation air in order to regulate the temperature continuously from HOT to COLD. Mode Control Damper DEF F, K, L, P, S Defrosts the windshield through the center defroster, side defroster, side registers and rear center register. FOOT/DEF G, K, L, P, Q, X Defrosts the windshield through the center defroster, side defrosters, side registers, and rear center register, while air is also blown out from the front and rear foot well register ducts. FOOT H, K, L, P, Q, X Air blows out of the foot well register duct, and side registers. In addition, air blows out slightly form the center defroster and side defroster. BI-LEVEL I, K, N, P, R, X Air blows out of the front and rear center registers, side registers and front and rear foot well register ducts. FACE I, J, M, O, S, W Air blows out of the front and rear center registers, and side registers.
3. AIR OUTLET AND AIRFLOW VOLUME
4. NEURAL NETWORK CONTROL In the previous automatic air conditioning system, the ECU determined the required outlet air temperature and blower air volume in accordance with the calculation formula that has been obtained based on information received from the sensors. However, because the sensors of a person is situated. For example, a given amount of solar radiation can feel comfortably warm in a cold climate, or extremely uncomfortable in a hot climate. Therefore, as a technique for effecting a higher level of control, a neural network has been adopted in the automatic air conditioning system. With this technique, the data that has been collected under varying environmental conditions i stored in the ECU, which effects control to provide enhanced air conditioning comfort. The neural network control consists of neurons the input layer, intermediate layer. The input layer neurons process the input data of the outside temperature, the amount of sunlight, and the cabin temperature based on the outputs of the switches and sensors, and output them to the intermediate layer neurons. Based on this data, the intermediate layer neurons adjust the strength of the mediate layer neurons. based on this data, the intermediate layer neurons adjust the strength of the links among the neurons. The sum of these is then calculated by the output layer neurons in the from of the required outlet temperature, solar correction, target airflow volume, and outlet mode control volume. Accordingly, Air Conditioning ECU controls the servomotors and blower motor in accordance with the control volumes that have been calculated by the neural network control.
5. SELF-DIAGNOSIS Air Conditioning ECU has a self-diagnosis function. It stores any operation failures in the air conditioning system memory in the form of DTC (Diagnostic Trouble Code). There are two methods for reading DTCs. One is to use a intelligent tester, and the other is to read the DTC on the heater control panel switch. DTCs are shown on the center display or multi display of the multi-information display, and on the intelligent tester.
6. HEATER CONTROL PANEL Push-button type heater control panel is used. The temperature control switches for the driver and front passenger are provided on the heater control panel to enhance their ease of use.
7. AIR CONDITIONING UNIT A semi-center location air conditioner unit, in the evaporator and heater core are placed in the vehicle's longitudinal direction, is used. As result, the air conditioning unit is made compact and lightweight.
8. EVAPORATOR A revolutionary super-slim structure evaporator is used. Placing the tanks at the top and the bottom of the evaporator and adopting a micropore tube construction have realized the following effects: The hear exchanging efficiency is improved. the temperature distribution is made more uniform. The evaporator is mode thinner. 58 mm (2.3 in.) --> 38 mm (1.5 in.)
9. HEATER CORE A compact, lightweight, and highly efficient straight flow (full-path flow) aluminum heater core is used.
10. BLOWER MOTOR The blower motor has an in-built blower controller, and is controlled with the duty control from the Air Conditioning ECU.
11. BUS CONNECTOR ABUS connector is used in the wire harness connection that connects the servomotor the Air Conditioning ECU. The BUS connector has an in built communication / drive IC which communicates with each servomotor connector, actuates the servomotor, and position detection function. This enables bus communication for the for the servo motor wire harness, for a more lightweight construction and a reduced number of wires.
12. SERVO MOTOR The pulse pattern type servomotor consists of a printed circuit board and servomotor. The printed circuit board has three contact points, phase. The smart connector detects the damper position and movement direction with this signal.
13. CLEAN AIR FILTER A clean air filter (micro dust and pollen filter) is used. this filter excels in the removal of dust and pollen. The filter made be disposed of easily as a combustible material, a feature that is provided in consideration of the environment.
14. CONDENSER The condenser consisting of two cooling portions: a condensing portion and a super-cooling portion, and gas-liquid separator (modulator) all integrated together. this condenser uses a sub-cool cycle that offers excellent heat-exchange performance. In the sub-cycle, after the refrigerant passes through the condensing portion of the condenser both the liquid refrigerant and the gaseous refrigerant that could not be liquefied are cooled again in the super-cooling portion. thus, the refrigerant is sent to the evaporator in an almost completely liquefied state.
15. A/C COMPRESSOR A/C compressor is continuously variable capacity type in which its capacity varies in accordance with the cooling load of the air conditioning. This compressor consists of the shaft, lug plate, piston, shoe, crank, chamber, cylinder, and solenoid control valve. A solenoid control valve that adjusts the suction pressure so that the suction pressure can be controlled as desired is provided. The crank chamber is connected to the suction passage. A solenoid control valve is provided between the suction passage (LO pressure) and the discharge passage (HI pressure). The solenoid control valve operates under duty cycle control in accordance with the signals from A/C ECU. When the solenoid control valve closes (solenoid coil is energized), a difference in pressure is created and the pressure in the crank chamber decreases. Then, the pressure that is applied to the right side of the piston becomes greater than the pressure that is applied to the left side of the piston. this compresses the spring and tilts the lug plate. As a result, the piston stroke increases and the discharge capacity increases. When the solenoid control valve opens (solenoid coil is not energized), the difference in pressure disappears. Then, the pressure that is applied to the right side of the piston. Thus, the spring elongates and eliminates the tilt of the lug plate. As a result, there is no piston stroke and the discharge capacity turns to decrease.

DESCRIPTION

This sensor detects the cabin temperature that is used as the basis for temperature control and sends appropriate signals to the A/C amplifier.

DETECTION ITEM AND TROUBLE AREA

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch on (IG) and push the intelligent tester main switch on. Select the item below in the DATA LIST, and read the display on the intelligent tester. MEASUREMENT ITEM NORMAL CONDITION AND DIAGNOSTIC NOTE Item Measure Item / Display (Range) Normal Condition Diagnostic Note ROOM TEMP Room temperature sensor / min.: -6.5°C (20.3°F) max.: 57.25°C (135.05°F) Actual cabin temperature is displayed - OK: The display is as specified in the normal condition. Result RESULT DESCRIPTION Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOM TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000) C: REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY A: GO TO NEXT STEP
2. INSPECT AIR CONDITIONING AMPLIFIER (TR - SG-1) Remove the A/C amplifier with connectors still connected. Turn the ignition switch on (IG) Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection Condition Specified condition D37-16 (TR) - D37-19 (SG-1) Ignition switch on (IG) at 25°C (77°F) 1.8 to 2.2 V D37-16 (TR) - D37-19 (SG-1) Ignition switch on (IG) at 40°C (104°F) 1.2 to 1.6 V HINT: As the temperature increases, the voltage decreases. Result RESULT DESCRIPTION Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOM TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000) C: REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY A: GO TO NEXT STEP
3. INSPECT A/C ROOM TEMPERATURE SENSOR Remove the A/C room temperature sensor. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection Condition Specified condition D34-1 - D34-2 10°C (50°F) 3.00 to 3.73 k D34-1 - D34-2 15°C (59°F) 2.45 to 2.88 k D34-1 - D34-2 20°C (68°F) 1.95 to 2.30 k D34-1 - D34-2 25°C (77°F) 1.60 to 1.80 k D34-1 - D34-2 30°C (86°F) 1.28 to 1.47 k D34-1 - D34-2 35°C (95°F) 1.00 to 1.22 k D34-1 - D34-2 40°C (104°F) 0.80 to 1.00 k D34-1 - D34-2 45°C (113°F) 0.65 to 0.85 k D34-1 - D34-2 50°C (122°F) 0.50 to 0.70 k D34-1 - D34-2 55°C (131°F) 0.44 to 0.60 k D34-1 - D34-2 60°C (140°F) 0.36 to 0.50 k NOTE: Only hold the sensor at its connector. Touching the sensor may change the resistance value. When measuring, the sensor temperature must be the same as the ambient temperature. HINT: As the temperature increases, the resistance decreases see scheme 44 NG: REPLACE A/C ROOM TEMPERATURE SENSOR OK: GO TO NEXT STEP
4. CHECK HARNESS AND CONNECTOR (A/C ROOM TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER) Disconnect the connector from A/C room temperature sensor. Disconnect the connector from A/C amplifier. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection Condition Specified condition D37-16 (TR) - D34-1 Always Below 1 D37-19 (SG-1) - D34-2 Always Below 1 D37-16 (TR) - Body ground Always 10 k or higher D37-19 (SG-1) - Body ground Always 10 k or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

The sensor connected to the engine room J/B assembly (front controller) detects fluctuations in the ambient temperature that is used for controlling the interior temperature. The sensor sends a to the A/C amplifier via the engine room J/B assembly (front controller).

DETECTION ITEM AND TROUBLE AREA

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent to the DLC3. Turn the ignition switch on (IG) and push the intelligent tester main switch on. Select the item below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER: MEASUREMENT ITEM NORMAL CONDITION AND DIAGNOSTIC NOTE Item Measurement Item / Display (Range) Normal Condition Diagnostic Note AMBI TEMP SENS Ambient temperature sensor / min.: -23.3°C (-9.94°F) max.: 65.96°C (150.71°F) Actual ambient temperature is displayed - OK: The display is as specified in the normal condition. Result RESULT DESCRIPTION Result Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOM TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000) C: REPLACE AIR CONDITIONING AMPLIFIER A: GO TO NEXT STEP
2. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (FRONT CONTROLLER) Remove the engine room J/B assembly (front controller) with connectors still connected. Turn the ignition switch on (IG). Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection Condition Specified condition 1I-4 - 1I-5 Ignition switch on (IG) at 25°C (77°F) 1.8 to 2.2 V 1I-4 - 1I-5 Ignition switch on (IG) at 40°C (104°F) 1.2 to 1.6 V HINT: As the temperature increases, the voltage decreases. Result RESULT DESCRIPTION Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOM TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000) C: Go to step 6 A: GO TO NEXT STEP
3. INSPECT A/C AMBIENT TEMPERATURE SENSOR Remove the A/C ambient temperature sensor. Measure the resistant according to the value(s) in thew table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection Condition Specified condition A11-1 - A11-2 10°C (50°F) 3.00 to 3.73 k A11-1 - A11-2 15°C (59°F) 2.45 to 2.88 k A11-1 - A11-2 20°C (68°F) 1.95 to 2.30 k A11-1 - A11-2 25°C (77°F) 1.60 to 1.80 k A11-1 - A11-2 30°C (86°F) 1.28 to 1.47 k A11-1 - A11-2 35°C (95°F) 1.00 to 1.22 k A11-1 - A11-2 40°C (104°F) 0.80 to 1.00 k A11-1 - A11-2 45°C (113°F) 0.65 to 0.85 k A11-1 - A11-2 50°C (122°F) 0.50 to 0.70 k A11-1 - A11-2 55°C (131°F) 0.44 to 0.60 k A11-1 - A11-2 60°C (140°F) 0.36 to 0.50 k NOTE: Only hold the sensor at its connector. Touching the sensor may change the resistance value. When measuring, the sensor temperature must be the same as the ambient temperature. HINT: As the temperature increases, the resistance decreases (See the graph). NG: REPLACE A/C AMBIENT TEMPERATURE SENSOR OK: GO TO NEXT STEP
4. CHECK HARNESS AND CONNECTOR (ENGINE ROOM J/B ASSEMBLY - A/C AMBIENT TEMPERATURE SENSOR) Disconnect the connector from A/C ambient temperature sensor. Disconnect the connector from the engine room J/B assembly. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection Condition Specified condition 1I-5 - A11-1 Always Below 1 1I-4- A11-2 Always Below 1 1I-5 - Body ground Always 10 k or higher 1I-4 - Body ground Always 10 k or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
5. CHECK HARNESS AND CONNECTOR (ENGINE ROOM J/B ASSEMBLY (FRONT CONTROLLER) - BODY GROUND) Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection Condition Specified condition 1H-8 - Body ground Always Below 1 NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
6. REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY (FRONT CONTROLLER) HINT: Check for DTC B1412/12 after replacing the engine room J/B assembly. OK: DTC B1412/12 is not output. NG: REPLACE AIR CONDITIONING AMPLIFIER OK: END

This sensor detects the evaporator temperature and sends the appropriate signals to the A/C amplifier. It is used for frost prevention, temperature and time-lag air flow control.

DETECTION ITEM AND TROUBLE AREA

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1. INSPECT AIR CONDITIONING AMPLIFIER (TEA - SGA) Remove the air conditioning amplifier with connectors still connected. Turn the ignition switch on (IG). Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection Condition Specified condition X1-6 (TEA) - X1-5 (SGA Ignition switch on (IG) at 0°C (32°F) 2.0 to 2.4 V X1-6 (TEA) - X1-5 (SGA Ignition switch on (IG) at 15°C (59°F) 1.4 to 1.8 V HINT: As the temperature increases, the voltage decreases. Result RESULT DESCRIPTION Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOM TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000) C: REPLACE AIR CONDITIONING AMPLIFIER A: GO TO NEXT STEP
2. INSPECT A/C EVAPORATOR TEMPERATURE SENSOR Remove the A/C evaporator temperature sensor. Measure the resistance according to the value(s) in table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection Condition Specified condition 1 - 2 -10°C (14°F) 7.30 to 9.10 k 1 - 2 -5°C (23°F) 5.65 to 6.95 k 1 - 2 0°C (32°F) 4.40 to 5.35 k 1 - 2 5°C (41°F) 3.40 to 4.15 k 1 - 2 10°C (50°F) 2.70 to 3.25 k 1 - 2 15°C (59°F) 2.14 to 2.58 k 1 - 2 20°C (68°F) 1.71 to 2.05 k 1 - 2 25°C (77°F) 1.38 to 1.64 k 1 - 2 30°C (86°F) 1.11 to 1.32 k NOTE: Only hold the sensor at its connector. Touching the sensor may change the resistance value. When measuring, the sensor temperature must be the same as the ambient temperature. HINT: As the temperature increases, the resistance decrease (Scheme 42) When replacing the A/C evaporator temperature sensor, the attached sub-harness should be replaced along with the sensor. NG: REPLACE A/C EVAPORATOR TEMPERATURE SENSOR OK: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - A/C EVAPORATOR TEMPERATURE SENSOR) Disconnect the connector from the air conditioning amplifier. Disconnect the connector from the A/C evaporator temperature sensor. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection Condition Specified condition X1-6 (TEA) - 1 Always Below 1 X1-5 (SGA) - 2 Always Below 1 X1-6 (TEA) - Body ground Always 10 k or higher X1-5 (SGA) - Body ground Always 10 k or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AIR CONDITIONING AMPLIFIER

The solar sensor is installed on the upper part of the instrument panel. The solar sensor detects the amount of solar radiation and controls the "AUTO" function of the air conditioner. The out put voltage of the solar sensor changes according to the amount decreases, the voltage increases. The air conditioning amplifier reads the output voltage from the solar sensor.

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DETECTION ITEM AND TROUBLE AREA

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch on (IG) and push the intelligent tester main switch on. Select the item below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER: MEASUREMENT ITEM NORMAL CONDITION AND DIAGNOSTIC NOTE Item Measure Item / Display (Range) Normal Condition Diagnostic Note SOLAR SENS-P Solar sensor (Passenger side) / min.: 0 max.: 255 Increases as brightness increases - OK: The display is as specified in the normal condition. Result RESULT DESCRIPTION Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOM TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000) C: REPLACE AIR CONDITIONING AMPLIFIER A: GO TO NEXT STEP
2. INSPECT MULTIPLEX NETWORK BODY ECU Remove the multiplex network body ECU with Turn the ignition switch on (IG). Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D7-6 (CLTB) - D7-4 (CLTE) Ignition switch on (IG) 10 to 14 V OK: Go to step 4 NG: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR Disconnect the connector from the A/C solar sensor. Disconnect the connector from the multiplex network body ECU. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition F1-6 (CLTB) - D7-6 (CLTB) Always Below 1 F1-3 (CLTE) - D7-4 (CLTE) Always Below 1 F1-6 (CLTB) - Body ground Always 10 k or higher F1-3 (CLTE) - Body ground Always 10 k or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE MULTIPLEX NETWORK BODY ECU
4. CHECK HARNESS AND CONNECTOR Disconnect the connector from A/C solar sensor. Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D37-14 (TSP) - F1-2 (TSR) Always Below 1 D37-14 (TSP) - Body ground Always 10 k or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
5. INSPECT A/C SOLAR SENSOR Remove the A/C solar sensor. Apply Battery voltage between terminals F1-3 (CLTE) and F1-6 (CLTB) of the A/C solar sensor. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition F1-2 (TSR) - F1-32 (CLTE) Sensor is subject to electric light 4.0 to 4.6 V F1-2 (TSR) - F1-32 (CLTE) Sensor is covered with a cloth Below 0.8 V NOTE: The connection procedure for using a digital tester such as a TOYOTA electrical tester is shown above. When using an analog tester, connect the positive (+) lead to terminal 2 and negative (-) lead to terminal 1 of the solar sensor. While using the battery during inspection, do not bring the positive and negative tester probes too close to each other as a short circuit may occur. HINT: As the inspection light is moved away from the sensor the voltage increases. Use an incandescent lamp for inspection. Bring it within 30 cm (11.8 in.) of the solar sensor. NG: REPLACE A/C SOLAR SENSOR OK: REPLACE AIR CONDITIONING AMPLIFIER

The ECM sends the engine speed signal to the TACO terminal of the A/C amplifier. The A/C amplifier reads the difference between compressor speed and engine speed. When the difference becomes too big, the A/C amplifier determines that the compressor locks, and turns the magnetic clutch off.

TESTER CONNECTION CONDITION AND SPECIFIED CONDITION

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1. INSPECT AIR CONDITIONING AMPLIFIER Remove the A/C amplifier with connectors still connected. Start the engine and press the A/C switch. Measure the waveform according to the condition in the table below. Standard TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D37-28 (TACO) - Body ground Engine running A/C switch: ON Pulse generation (Scheme 55) OK: Wave form appears (Scheme 55) OK: Go to step 3 NG: GO TO NEXT STEP
2. CHECK HARNESS AND CONNECTOR (ECM - AIR CONDITIONING AMPLIFIER) Disconnect the connector from A/C amplifier. Disconnect the connector from the ECM. Measure the resistance according to the value(s) in the table below. Standard TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D37-28 (TACO) - D41-1 (TACH) Always Below 1 D37-28 (TACO) - Body ground Always 10 k or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO «SFI SYSTEM»(/toyota/avalon/xx30-2005-2007/remont/testing-diagnostics/#engine-control-system)
3. INSPECT AIR CONDITIONING AMPLIFIER (LOCK - SG-3) Remove the A/C amplifier with connectors still connected. Start the engine and press the AUTO switch. Measure the waveform according to the condition in the table below. Standard TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D37-9 (LOCK) - D37-17 (SG-3) Engine running Magnetic clutch ON Blower switch: ON Pulse generation (Scheme 58) Result RESULT DESCRIPTION Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000) C: REPLACE AIR CONDITIONING AMPLIFIER A: GO TO NEXT STEP
4. INSPECT A/C LOCK SENSOR (W/ MAGNET CLUTCH COMPRESSOR ASSEMBLY) Disconnect the A/C lock sensor (w/ magnet clutch compressor assembly) connector. Measure the resistance according to the value(s) in the table below/ Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection Condition Specified condition D37-28 (TACO) - D41-1 (TACH) at 20°C (68°F) 160 to 320 NG: REPLACE A/C LOCK SENSOR (W/ MAGNET CLUTCH COMPRESSOR ASSEMBLY) OK: GO TO NEXT STEP
5. CHECK HARNESS AND CONNECTOR (A/C LOCK SENSOR - AIR CONDITIONING AMPLIFIER) Disconnect the connector from A/C lock sensor (w/magnet clutch compressor assembly) Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Standard TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D37-9 (LOCK) - B8-1 Always Below 1 D37-17 (SG-3) - B8-2 Always Below 1 D37-9 (LOCK) - Body ground Always 10 k or higher D37-17 (SG-3) - Body ground Always 10 k or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AIR CONDITIONING AMPLIFIER

This DTC is output when refrigerant pressure is extremely low (0.19 MPa (2.0 kgf/cm 2 , 28 psi) or less) or extremely high (3.14 MPa (32.0 kgf/cm 2 , 455 psi) or more). The pressure sensor, which is installed on the pipe of the high pressure side to detect refrigerant pressure, outputs the refrigerant pressure signal to the air conditioning amplifier. The air conditioning amplifier converts the signals into pressure according to the sensor characteristics to control the compressor.

HINT

Be sure to check the refrigerant volume first when this DTC is output because this DTC can also be output if there is no refrigerant in the cycle.

DETECTION ITEM AND TROUBLE AREA

Scheme 68

Scheme 69

Scheme 70

Scheme 71

Scheme 72

Scheme 73

1. INSPECT REFRIGERANT PRESSURE Set the manifold gauge (See «ON-VEHICLE INSPECTION»(ref-245146-S21335243772006102400000) ). Read the manifold gauge pressure when the following conditions are established. Prepare the vehicle according to the chart below. ITEM CONDITION DESCRIPTION Item Condition R/F Switch RECIRC (30 to 35°C (86 to 95°F)) Vehicle Doors Fully open Temperature Setting MAX COLD Blower Speed HI A/C ON Standard: Low pressure side: 0.15 to 0.25 MPa (1.5 to 2.5 kgf/cm 2, 21.3 to 35.6 psi) High pressure side: 1.37 to 1.57 MPa (14 to 16 kgf/cm 2, 199 to 228 psi) NG: CHARGE REFRIGERANT OK: GO TO NEXT STEP
2. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to DTC3. Turn the ignition switch on (IG) and push the intelligent tester main switch on. Select the items below in the DATA LIST, and read the displays on the intelligent tester. MEASUREMENT ITEM NORMAL CONDITION AND DIAGNOSTIC NOTE Item Measurement Item / Display (Range) Normal Condition Diagnostic Note REG PRESS SENS Regulator pressure sensor / min.: 0 max.: 255 Actual regulator pressure is displayed - OK: The display is as specified in the normal condition. Result RESULT DESCRIPTION Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000) C: REPLACE AIR CONDITIONING AMPLIFIER A: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - A/C PRESSURE SENSOR) Disconnect the connector from A/C amplifier. Disconnect the connector from the A/C pressure sensor. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified Condition A35-2 (PR) - D37-13 (PRE) Always Below 1 A35-3 (+) - D37-26 (S5-2) Always Below 1 A35-1 (-) - D37-28 (SG-2) Always Below 1 D37-13 (PRE) - Body ground Always 10 k or higher D37-26 (S5-2) - Body ground Always 10 k or higher D37-28 (SG-2) - Body ground Always 10 k or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
4. INSPECT AIR CONDITIONING AMPLIFIER (S5-2 - SG-2) Remove the A/C amplifier. Reconnect the connector to the A/C amplifier. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified Condition D37-26 (S5-2) - D37-38 (SG-2) Ignition switch on (IG) 4.5 to 5.5 V D37-26 (S5-2) - D37-38 (SG-2) Ignition switch off Below 1 V NG: REPLACE AIR CONDITIONING AMPLIFIER OK: GO TO NEXT STEP
5. INSPECT A/C PRESSURE SENSOR Start the engine. Operate the air conditioning system. Disconnect the connector from A/C pressure sensor. Install the manifold gauge set (See «ON-VEHICLE INSPECTION»(ref-245146-S21335243772006102400000) ). Connect the positive (+) lead from the three 1.5 V dry cell batteries to terminal 3 and negative (-) lead to terminal 1. Check the voltage between terminals 2 and 1 of A/C pressure sensor. Voltage: The voltage depends on the refrigerant pressure (Scheme 68) NG: REPLACE A/C PRESSURE SENSOR OK: REPLACE AIR CONDITIONING AMPLIFIER

The solar sensor is installed on the upper part of the instrument panel. The solar sensor detects the amount of solar radiation and controls the "AUTO" function of the air conditioner. The out put voltage of the solar sensor changes according to the amount decreases, the voltage increases. The air conditioning amplifier reads the output voltage from the solar sensor.

Scheme 74

DETECTION ITEM AND TROUBLE AREA

Scheme 75

Scheme 76

Scheme 77

Scheme 78

Scheme 79

Scheme 80

Scheme 81

1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch on (IG) and push the intelligent tester main switch on. Select the item below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER: MEASUREMENT ITEM NORMAL CONDITION AND DIAGNOSTIC NOTE Item Measurement Item / Display (Range) Normal Condition Diagnostic Note SOLAR SENS-D Solar sensor (Driver side) / min.: 0 max.: 255 Increases as brightness increases - OK: The display is as specified in the normal condition. Result RESULT DESCRIPTION Result Proceed to NG A OK (Checking from the PROBLEM SYMPTOMS TABLE) B OK (Checking from the DTC) C B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000) C: REPLACE AIR CONDITIONING AMPLIFIER A: GO TO NEXT STEP
2. INSPECT MULTIPLEX NETWORK BODY ECU (CLTB - CLTE) Remove the multiplex network body ECU with connectors sill connected. Turn the ignition switch on (IG). Measure the voltage according to the value(s) table below. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified Condition D7-6 (CLTB) - D7-4 (CLTE) Ignition switch on (IG) 10 to 14 V OK: Go to step 4 NG: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK BDY ECU - A/C SOLAR SENSOR) Disconnect the connector from the A/C solar sensor. Disconnect the connector from the multiplex network body ECU. Measure the resistance according to the value(s) table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified Condition F1-6 (CLTB) - D7-6 (CLTB) Always Below 1 F1-3 (CLTE) - D7-4 (CLTE) Always Below 1 F1-6 (CLTB) - Body ground Always 10 k or higher F1-3 (CLTE) - Body ground Always 10 k or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE MULTIPLEX NETWORK BODY ECU
4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - A/C SOLAR SENSOR) Disconnect the connector from the A/C solar sensor. Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified Condition D37-35 (TSD) - F1-1 (TSL) Always Below 1 D37-35 (TSD) - Body ground Always 10 k or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
5. INSPECT A/C SOLAR SENSOR Remove the A/C solar sensor. Apply battery voltage between terminals F1-3 (CLTE) and F1-6 (CLTB) of the A/C solar sensor. Measure the voltage according to the value(s) table below. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified Condition F1-1 (TSL) - F1-3 (CLTE) Sensor is subject to electric light 4.0 to 4.6 V F1-1 (TSL) - F1-3 (CLTE) Sensor is subject to electric light Below 0.8 V NOTE: The connection procedure for using a digital tester such as a TOYOTA electrical tester is shown above. when using an analog tester, connect the positive (+) lead to terminal 2 and negative (-) lead to terminal 1 of the solar sensor. While using the battery during inspection, do not bring the positive and negative tester probes too close to each other as a short circuit may occur. HINT: As the inspection light is moved away from the sensor, the voltage increases. Use an incandescent light for inspection. Bring it within 30 cm (11.8 in.) of the solar sensor. NG: REPLACE A/C SOLAR SENSOR OK: REPLACE AIR CONDITIONING AMPLIFIER

The air mix damper servo sends pulse signals to inform the A/C amplifier of the damper position. The A/C amplifier activates the motor (normal, reverse) based on the signals to move the air mix damper (passenger seat) to any position, which adjusts the amount of air passing the heater core after passing the evaporator to control the blowing temperature.

HINT

Confirm that no mechanical problem is present because this diagnostic code can be out put when either a damper link or damper is mechanically locked.

DETECTION ITEM AND TROUBLE AREA

Scheme 82

The damper servo (air inlet control) sends pulse signals to inform the A/C amplifier of the damper position. The A/C amplifier activates the motor (normal, reverse) based on the signals to move the air inlet mode selection air inlet control damper to any position, which controls the intake air used as FRESH, FRESH/RECIRCULATION and RECIRCULATION.

HINT

Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or damper is mechanically locked.

DETECTION ITEM AND TROUBLE AREA

Scheme 83

The mode damper servo sends pulse signals to inform the A/C amplifier of the damper position. The A/C amplifier activates the motor (normal, reverse) based on the signals to move the mode damper to any position, which controls the air outlet switching.

HINT

Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or damper is mechanically locked.

DETECTION ITEM AND TROUBLE AREA

Scheme 84

The air mix damper servo sends pulse signals to inform the A/C amplifier of the damper position. The A/C amplifier activates the motor (normal, reverse) based on the signals to move the air mix damper (driver seat) to any position, which adjusts the amount of air passing the heater core after passing the evaporator to control the blowing air temperature.

HINT

Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or damper is mechanically locked.

DETECTION ITEM AND TROUBLE AREA

Scheme 85

In this circuit, the compressor assembly receives a signal on refrigerant compression required by the A/C amplifier. Based on the signal, the compressor assembly changes the degree of refrigerant compression.

DETECTION ITEM AND TROUBLE AREA

Scheme 86

Scheme 87

Scheme 88

Scheme 89

Scheme 90

Scheme 91

1. INSPECT W/MAGNETIC CLUTCH COMPRESSOR ASSEMBLY Disconnect the w/ magnet clutch compressor assembly connector. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition B4-2 (SOL+) - B4-1 (SOL-) at 20°C (68°F) 10 to 11 NG: REPLACE MAGNETIC CLUTCH ASSEMBLY OK: GO TO NEXT STEP
2. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - WITH MAGNET CLUTCH COMPRESSOR ASSEMBLY) Disconnect the connector from cooler compressor assembly. Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition D37-5 (SOL+) - B4-2 (SOL+) Always Below 1 D37-5 (SOL+) - Body ground Constant 10 k or higher B4-1 (SOL-) - Body ground Constant Below 1 NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
3. INSPECT AIR CONDITIONING AMPLIFIER (SOL +-BODY GROUND) Remove the air conditioning amplifier with connectors still connected. Turn the ignition switch on (IG). Press the AUTO switch ON. Measure the waveform between terminal SOL+ (D37-5) of the A/C amplifier and body ground. OK: Waveform appears (Scheme 86) HINT: Waveform varies with the blower level. Result RESULT DESCRIPTION Proceed to Result A NG OK (Checking from the DTC) B OK (Checking from the PROBLEM SYMPTOMS TABLE) B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000) A: REPLACE AIR CONDITIONING AMPLIFIER

Voltage is output from the A/C amplifier to the seat heater control sub-assembly. The voltage changes according to the resistance of the thermistor in the seat heater LH (cushion). The A/C amplifier reads changes in voltage to control the seat heater. The resistance of the thermistor in the seat heater LH (cushion) differs according to ambient temperature.

DETECTION ITEM AND TROUBLE AREA

Scheme 92

Scheme 93

Scheme 94

Scheme 95

Scheme 96

1. INSPECT AIR CONDITIONING AMPLIFIER Remove the A/C amplifier with connectors still connected. Turn the ignition switch on (IG). Measure the voltage and resistance according to the value(s) in the table below. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D37-24 (SHL) - Body ground Seat heater switch: ON Below 1 V D37-24 (SHL) - Body ground Seat heater switch: OFF 10 to 14 V Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D38-12 (SG8) - Body ground Always Below 1 NG: REPLACE AIR CONDITIONING AMPLIFIER OK: GO TO NEXT STEP
2. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - SEAT HEATER CONTROL SUB-ASSEMBLY)) Disconnect the connector from A/C amplifier. Disconnect the connector from the seat heater control sub-assembly. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D38-5 (TSHL) - Q11-5 (TDC+) Always Below 1 D38-12 (SG8) - Q11-3 (TDC-) Always Below 1 D37-24 (SHL) - Q11-2 (TH) Always Below 1 D38-5 (TSHL) - Body ground Always 10 k or higher D38-12 (SG8) - Body ground Always 10 k or higher D37-24 (SHL) - Body ground Always 10 k or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
3. INSPECT SEAT HEATER LH (SEAT CUSHION) Disconnect the seat cushion heater. Heat the temperature sensor and thermostat with a light. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Terminal No. Condition Specified condition A2 - A3 Ambient temperature (15°C to 40°C) 4 k to 15 k If the resistance is not as specified, replace the seat cushion heater assembly. NG: REPLACE SEAT HEATER LH (SEAT CUSHION) OK: REPLACE SEAT HEATER CONTROL SUB-ASSEMBLY

Voltage is output from the A/C amplifier to the seat heater control sub-assembly. The voltage changes according to the resistance of the thermistor in the seat heater LH (cushion). The A/C amplifier reads changes in voltage to control the seat heater. The resistance of the thermistor in the seat heater LH (cushion) differs according to ambient temperature.

DETECTION ITEM AND TROUBLE AREA

Scheme 97

Scheme 98

Scheme 99

Scheme 100

Scheme 101

1. INSPECT AIR CONDITIONING AMPLIFIER Remove the A/C amplifier with connectors still connected. Turn the ignition switch on (IG). Measure the voltage and resistance according to the value( s) in the table below. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D37-2 (SHR) - Body ground Seat heater switch: ON Below 1 V D37-2 (SHR) - Body ground Seat heater switch: OFF 10 to 14 V Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D38-11 (SG7) - Body ground Always Below 1 NG: REPLACE AIR CONDITIONING AMPLIFIER OK: GO TO NEXT STEP
2. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - SEAT HEATER CONTROL SUB-ASSEMBLY) Disconnect the connector from A/C amplifier. Disconnect the connector from the seat heater sub-assembly. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D38-4 (TSHR) - P13-5 (TDC+) Always Below 1 D38-11 (SG7) - P13-3 (TDC-) Always Below 1 D37-2 (SHR) - P13-2 (TH) Always Below 1 D38-4 (TSHR) - Body ground Always 10 k or higher D38-11 (SG7) - Body ground Always 10 k or higher D37-2 (SHR) - Body ground Always 10 k or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
3. INSPECT SEAT HEATER RH (SEAT CUSHION) Disconnect the seat cushion heater. Heat the temperature sensor and thermostat with a light. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Terminal No. Condition Specified condition A2 - A3 Ambient temperature (15°C to 40°C) 4 k to 15 k If the resistance is not as specified, replace the seat cushion heater assembly. NG: REPLACE SEAT HEATER RH (SEAT CUSHION) OK: REPLACE SEAT HEATER CONTROL SUB-ASSEMBLY

The air conditioning harness assembly connects the air conditioning amplifier and each servomotor. The A/C amplifier supplies power and sends operation instructions to each servomotor through the air conditioning harness assembly. Each servomotor sends the damper position information to the A/C amplifier.

DETECTION ITEM AND TROUBLE AREA

Scheme 102

Scheme 103

Scheme 104

1. INSPECT AIR CONDITIONING AMPLIFIER Remove the A/C amplifier with connectors still connected. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition X1-2 (BUS G) - Body ground Always Below 1 V NG: REPLACE AIR CONDITIONING AMPLIFIER OK: GO TO NEXT STEP
2. INSPECT AIR CONDITIONING AMPLIFIER Remove the A/C amplifier with connectors still connected. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition X1-4 (B BUS) - X1-2 (BUS G) Ignition switch on (IG) 10 to 14 V X1-4 (B BUS) - X1-2 (BUS G) Ignition switch off Below 1 V NG: REPLACE AIR CONDITIONING AMPLIFIER OK: REPLACE AIR CONDITIONING HARNESS ASSEMBLY

DETECTION ITEM AND TROUBLE AREA

The blower motor is operated by signals from the A/C amplifier. Blower motor speed signals are transmitted by changes in the duty ratio.

Duty Ratio

The duty ratio is the ratio of the period of continuity in one cycle. For example, if A is the period of continuity in one cycle, B is the period of non-continuity.

The blower motor controller controls the blower motor speed.

Scheme 105

Scheme 106

Scheme 107

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Scheme 109

Scheme 110

Scheme 111

Scheme 112

Scheme 113

Scheme 114

1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the ignition switch on (IG) and push the intelligent tester main switch on. Select the item below in the DATA LIST, and read the display on the intelligent tester. DATA LIST / AIR CONDITIONER: MEASUREMENT ITEM NORMAL CONDITION AND DIAGNOSTIC NOTE Item Measurement Item / Display (Range) Normal Condition Diagnostic Note BLOWER LEVEL Blower motor speed level / min.: 0 level max.: 31 level Increases in the range between 0 and 31 as the speed increase - OK: The display is as specified in the normal condition. NG: REPLACE AIR CONDITIONING AMPLIFIER OK: GO TO NEXT STEP
2. CHECK ACTUATOR Set the actuator check mode (See «ACTUATOR CHECK»(ref-245146-S15246731232006102400000) ). Press the UPDr switch to set the step operation. Check the air flow level by hand. DISPLAY CODE DESCRIPTION Display Code Blower level 0 0 1 1 2 17 3 17 4 17 5 17 6 17 7 17 8 17 9 31 OK: Blower level changes in accordance with each display code. NG: Go to step 3 OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000)
3. INSPECT FUSE (HEATER) Remove the HEATER fuse from the engine room R/B and J/B. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester item Condition Specified condition HEATER fuse Always Below 1 NG: REPLACE FUSE (HEATER) OK: GO TO NEXT STEP
4. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - AIR CONDITIONING AMPLIFIER) Disconnect the connector from blower motor. Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D37-11 (BLW) - D42-2 (SI) Always Below 1 D37-11 (BLW) - Body ground Constant 10 k or higher NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: GO TO NEXT STEP
5. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BODY GROUND) Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D42-1(GND) - Body ground Constant Below 1 NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: GO TO NEXT STEP
6. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BATTERY) Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D42-1(+B) - Body ground Constant 10 to 14 V NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: GO TO NEXT STEP
7. INSPECT BLOWER MOTOR Remove the blower motor. Connect positive (+) lead to terminal 2 of the blower motor connector and negative (-) lead to terminal 1. OK: Blower motor operates smoothly. NOTE: While using the battery during inspection, do not bring the positive and negative tester probes too close to each other as a short circuit may occur. NG: REPLACE BLOWER MOTOR OK: GO TO NEXT STEP
8. INSPECT AIR CONDITIONING AMPLIFIER (BLW - BODY GROUND) Reconnect the connector to the blower motor. Reconnect the connector to the A/C amplifier. Remove the A/C amplifier with connectors still connected. Turn the ignition switch on (IG). Press the blower switch on (LO). Measure the waveform between terminal BLW (D37-11) of the A/C amplifier and body ground. HINT: Waveform varies with the blower level. NG: REPLACE AIR CONDITIONING AMPLIFIER OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000)

When the A/C switch is turned on, the magnetic clutch ON signal is sent from the MGC terminal of the A/C amplifier. Then, the MG CLT relay turns on to operate the magnetic clutch.

Scheme 115

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Scheme 119

1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER Connect the intelligent tester to DLC3. Turn the ignition switch on (IG) and push the intelligent tester main switch on. Select the item below in the ACTIVE TEST and then check that the relay operates. DATA LIST / AIR CONDITIONER: DETECTION ITEM AND TROUBLE AREA Item Measurement Item / Display (Range) Diagnostic Note A/C MAG CLUTCH Magnetic clutch relay / OFF, ON - NG: Go to step 2 OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000)
2. INSPECT FUSE (A/C COMP) Remove the A/C COMP fuse from the instrument panel Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester item Condition Specified condition A/C COMP fuse Always Below 1 NG: REPLACE FUSE (A/C COMP) OK: GO TO NEXT STEP
3. INSPECT MAGNETIC CLUTCH RELAY Remove the MG CLT relay (magnetic clutch relay) from engine room R/B and J/B. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection Condition Specified condition 3 - 5 Always 10 k or higher 3 - 5 When Battery voltage is applied to terminals 1 and 2 Below 1 (When Battery voltage is applied to terminals 1 and 2) NOTE: While using the battery during inspection, do not bring the positive and negative tester probes too close to each other as a short circuit may occur. NG: REPLACE MAGNETIC CLUTCH RELAY OK: GO TO NEXT STEP
4. INSPECT W/MAGNETIC CLUTCH COMPRESSOR ASSEMBLY Disconnect the connector from the w/ magnet clutch compressor assembly. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection Condition Specified condition B8-3 - Body Ground Always Below 1 NG: REPLACE W/MAGNETIC CLUTCH COMPRESSOR ASSEMBLY OK: GO TO NEXT STEP
5. INSPECT AIR CONDITIONING AMPLIFIER Remove the A/C amplifier and disconnect the connector. Turn the ignition switch on (IG). Measure the voltage according to the value(s) in the table below. voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection Condition Specified condition D37-3 (MGC)- Body Ground Magnet clutch: ON Below 1 V D37-3 (MGC)- Body Ground Magnet clutch: OFF 10 to 14 V Result RESULT DESCRIPTION Result Proceed to NG A OK (w/o Smart key system) B OK (w/Smart key system) C B: GO TO «STARTING SYSTEM»(ref-245134-S07724543992006102400000) C: GO TO «PUSH BUTTON START SYSTEM»(ref-245144-S33383390862006102400000) A: REPLACE AIR CONDITIONING AMPLIFIER

Battery voltage is supplied to the heater control panel through the HTR fuse.

Scheme 120

Scheme 121

Scheme 122

1. CHECK HARNESS AND CONNECTOR (IG+ - BODY GROUND) Disconnect the connector from heater control panel LH. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition E6-1 (IG+) - Body ground Ignition switch on (IG) 10 to 14 V E6-1 (IG+) - Body ground Ignition switch off Below 1 V Result RESULT DESCRIPTION Result Proceed to OK A NG (w/o Smart key system) B NG (w/ Smart key system) C B: GO TO «STARTING SYSTEM»(ref-245134-S07724543992006102400000) C: GO TO «PUSH BUTTON START SYSTEM»(ref-245144-S33383390862006102400000) A: GO TO NEXT STEP
2. CHECK HARNESS AND CONNECTOR (GND - BODY GROUND) Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition E6-24 (GND) - Body ground Always Below 1 NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000)

The heater control panel LH receives the heater control panel switch operation signal from the heater control panel RH.

Scheme 123

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Scheme 125

Scheme 126

1. INSPECT HEATER CONTROL PANEL RH Remove the heater control panel RH. Disconnect the connector from heater control panel RH. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester item (Symbols) Condition Specified condition E21-13 (SWB) - E21-5 (SW2) REC switch: ON Below 1 E21-13 (SWB) - E21-3 (SW0) OFF switch: ON Below 1 E21-13 (SWB) - E21-4 (SW1) P-TEMP UP switch: ON Below 1 E21-12 (SWA) - E21-5 (SW2) A/C switch: ON Below 1 E21-12 (SWA) - E21-3 (SW0) AUTO switch: ON Below 1 E21-12 (SWA) - E21-4 (SW1) P-TEMP DW switch: ON Below 1 E21-13 (SWB) - E21-5 (SW2) REC switch: OFF 10 k or higher E21-13 (SWB) - E21-3 (SW0) OFF switch: OFF 10 k or higher E21-13 (SWB) - E21-4 (SW1) P-TEMP UP switch: OFF 10 k or higher E21-12 (SWA) - E21-5 (SW2) A/C switch: OFF 10 k or higher E21-12 (SWA) - E21-3 (SW0) AUTO switch: OFF 10 k or higher E21-12 (SWA) - E21-4 (SW1) P-TEMP DW switch: OFF 10 k or higher NG: REPLACE HEATER CONTROL PANEL RH OK: GO TO NEXT STEP
2. CHECK HARNESS AND CONNECTOR (HEATER CONTROL PANEL RH - HEATER CONTROL PANEL LH) Disconnect the connector from heater control panel LH. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition E6-16 (SWA) - E21-12 (SWA) Always Below 1 E6-4 (SW0) - E21-3 (SW0) Always Below 1 E6-5 (SW1) - E21-4 (SW1) Always Below 1 E6-6 (SW2) - E21-5 (SW2) Always Below 1 E6-17 (SWB) - E21-13 (SWB) Always Below 1 E6-16 (SWA) - Body ground Always 10 k or higher E6-4 (SW0) - Body ground Always 10 k or higher E6-5 (SW1) - Body ground Always 10 k or higher E6-6 (SW2) - Body ground Always 10 k or higher E6-17 (SWB) - Body ground Always 10 k or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000)

The seat blower changes airflow volume according to a signal from the A/C amplifier.

Scheme 127

Scheme 128

Scheme 129

Scheme 130

Scheme 131

Scheme 132

Scheme 133

Scheme 134

Scheme 135

Scheme 136

1. INSPECT FUSE (S-HTR) Remove the S-HTR fuse from the instrument panel J/B. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester item Condition Specified condition S-HTR fuse Always Below 1 NG: REPLACE FUSE (S-HTR) OK: GO TO NEXT STEP
2. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - SEAT CLIMATE CONTROL BLOWER) Disconnect the connector from A/C amplifier. Disconnect the connector from the seat climate control blower. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D38-16 (LOUT) - Q13-3 (BCS) Always Below 1 D38-16 (LOUT) - Q12-3 (BBS) Always Below 1 D38-8 (ROUT) - P14-3 (BCS) Always Below 1 D38-8 (ROUT) - P15-3 (BBS) Always Below 1 D38-16 (LOUT) - Body ground Always 10 k or higher D38-8 (ROUT) - Body ground Always 10 k or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE BLOWER - SEAT BACK CLIMATE BLOWER) Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition Q12-2 (BFB+) - Q13-2 (BFCL) Always Below 1 P15-2 (BFB+) - P14-2 (BFCL) Always Below 1 Q12-2 (BFB+) - Body ground Always 10 k or higher P15-2 (BFB+) - Body ground Always 10 k or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
4. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL BLOWER - BATTERY) Measure the voltage according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition Q13-1 (BFC+) - Body ground Ignition switch off Below 1 Q13-1 (BFC+) - Body ground Ignition switch on (IG) 10 to 14 V P14-1 (BFC+) - Body ground Ignition switch off Below 1 P14-1 (BFC+) - Body ground Ignition switch on (IG) 10 to 14 V Result RESULT DESCRIPTION Result Proceed to OK A NG (w/o Smart key system) B NG (w/ Smart key system) C B: GO TO «STARTING SYSTEM»(ref-245134-S07724543992006102400000) C: GO TO «PUSH BUTTON START SYSTEM»(ref-245144-S33383390862006102400000) A: GO TO NEXT STEP
5. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL BLOWER - BODY GROUND) Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition Q12-1 (BFB-) - Body ground Always Below 1 Q13-4 (BFC-) - Body ground Always Below 1 P14-4 (BFC-) - Body ground Always Below 1 P15-1 (BFB-) - Body ground Always Below 1 NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
6. INSPECT AIR CONDITIONING AMPLIFIER Remove the A/C amplifier with connectors still connected. Turn the ignition switch on (IG). Measure the waveform according to the value(s). Waveform TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Connection Specified condition D38-8 (ROUT) - Body ground Seat heater switch: ON (Scheme 131)D38-16 (LOUT) - Body ground Seat heater switch: ON (Scheme 131)OK: Waveform appears (Scheme 131) HINT: Waveform varies with the blower level. NG: REPLACE AIR CONDITIONING AMPLIFIER OK: REPLACE SEAT CLIMATE CONTROL BLOWER

Battery voltage is supplied to the seat heater control sub-assembly through the S-HTR fuse.

Scheme 137

Scheme 138

Scheme 139

1. CHECK HARNESS AND CONNECTOR (B - BATTERY) Disconnect the connector from seat heater control sub-assembly. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition Q11-1 (B) - Body ground Ignition switch on (IG) 10 to 14 V Q11-1 (B) - Body ground Ignition switch off Below 1 V P13-1 (B) - Body ground Ignition switch on (IG) 10 to 14 V P13-1 (B) - Body ground Ignition switch off Below 1 V Result RESULT DESCRIPTION Result Proceed to OK A NG (w/o Smart key system) B NG (w/ Smart key system) C B: GO TO «STARTING SYSTEM»(ref-245134-S07724543992006102400000) C: GO TO «PUSH BUTTON START SYSTEM»(ref-245144-S33383390862006102400000) A: GO TO NEXT STEP
2. CHECK HARNESS AND CONNECTOR (E - BODY GROUND) Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition Q11-6 (E) - Body ground Always Below 1 P13-6 (E) - body ground Always Below 1 NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000)

Voltage of 5 V is output from the S5-4 terminal of the A/C amplifier to the seat heater SW. The SW4 and SW5 terminals of the A/C amplifier read changes in voltage sent back from the seat heater SW. The voltage sent back from the seat heater SW differs according to the set temperature of the seat heater SW.

Scheme 140

Scheme 141

Scheme 142

Scheme 143

Scheme 144

Scheme 145

1. INSPECT AIR CONDITIONING AMPLIFIER Remove the A/C amplifier with connectors still connected. Turn the ignition switch on (IG). Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D38-7 (S5-4) - D38-10 (SG-4) Ignition switch on (IG) 4.5 to 5.5 V D38-3 (SW4), D38-2 (SW5) - D38-10 (SG-4) Seat heater switch: COOL (HI) 0.17 V D38-3 (SW4), D38-2 (SW5) - D38-10 (SG-4) Seat heater switch: COOL (MID) 0.48 to 1.17 V D38-3 (SW4), D38-2 (SW5) - D38-10 (SG-4) Seat heater switch: COOL (LO) 1.31 to 2.01 V D38-3 (SW4), D38-2 (SW5) - D38-10 (SG-4) Seat heater switch: OFF 2.15 to 2.83 V D38-3 (SW4), D38-2 (SW5) - D38-10 (SG-4) Seat heater switch: HOT (LO) 2.97 to 3.67 V D38-3 (SW4), D38-2 (SW5) - D38-10 (SG-4) Seat heater switch: HOT (MID) 3.81 to 4.49 V D38-3 (SW4), D38-2 (SW5) - D38-10 (SG-4) Seat heater switch: HOT (HI) 4.8 V NG: Go to step 2 OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000)
2. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - SEAT HEATER SWITCH) Disconnect the connector from A/C amplifier. Disconnect the connector from the seat heater switch. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D38-3 (SW4) - D27-3 (RVL) Always Below 1 D38-2 (SW5) - D27-1 (RVR) Always Below 1 D38-7 (S5-4) - D27-6 (SW+) Always Below 1 D38-10 (SG-4) - D27-4 (SW-) Always Below 1 D38-3 (SW4) - Body ground Always 10 k or higher D38-2 (SW5) - Body ground Always 10 k or higher D38-7 (S5-4) - Body ground Always 10 k or higher D38-10 (SG-4) - Body ground Always 10 k or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP.
3. INSPECT SEAT HEATER SWITCH Connect the 3 dry cell batteries (1.5 V) in series. Remove the seat heater switch. Connect the positive (+) lead from the battery to terminal 6 and the negative (-) lead from the battery to terminal 4. Measure the voltage between terminals 3 *1 , 1 *2 and 4 according to the value(s) in the table below. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D27-6 (SW+) - D27-4 (SW-) Always 4.0 to 5.0 V D27-3 (RVL) (1) , D27-1 (RVR) (2) - D27-4 (SW-) Seat heater switch: COOL (HI) 0.15 V D27-3 (RVL) (1) , D27-1 (RVR) (2) - D27-4 (SW-) Seat heater switch: COOL (MID) 0.43 to 1.05 V D27-3 (RVL) (1) , D27-1 (RVR) (2) - D27-4 (SW-) Seat heater switch: COOL (LO) 1.18 to 1.81 V D27-3 (RVL) (1) , D27-1 (RVR) (2) - D27-4 (SW-) Seat heater switch: OFF 1.94 to 2.55 V D27-3 (RVL) (1) , D27-1 (RVR) (2) - D27-4 (SW-) Seat heater switch: HOT (LO) 2.67 to 3.30 V D27-3 (RVL) (1) , D27-1 (RVR) (2) - D27-4 (SW-) Seat heater switch: HOT (MID) 3.43 to 4.04 V D27-3 (RVL) (1) , D27-1 (RVR) (2) - D27-4 (SW-) Seat heater switch: HOT (HI) 4.3 V (1) Driver side (2) Front passenger side NG: REPLACE SEAT HEATER SWITCH OK: REPLACE AIR CONDITIONING AMPLIFIER

Battery voltage is supplied to the seat heater switch through the S-HTR fuse. When the seat heater switch is turned on, the seat heater switch indicator comes on.

Scheme 146

Scheme 147

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Scheme 150

Scheme 151

1. INSPECT FUSE (ECU IG NO. 1) Remove the ECU IG NO. 1 fuse from the instrument panel J/B. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester item Condition Specified condition IG NO. 1 fuse Always Below 1 NG: REPLACE FUSE (ECU IG NO. 1) OK: GO TO NEXT STEP.
2. CHECK HARNESS AND CONNECTOR (SEAT HEATER SWITCH - BATTERY) Disconnect the connector from seat heater switch. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D27-2 (IG) - Body ground Ignition switch on (IG) 10 to 14 V D27-2 (IG) - Body ground Ignition switch off Below 1 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
3. INSPECT SEAT HEATER SWITCH Reconnect the connector to the seat heater switch. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D27-10 (INDR) - Body ground Ignition switch on (IG) 10 to 14 V D27-9 (INDL) - Body ground Ignition switch on (IG) 10 to 14 V D27-10 (INDR) - Body ground Ignition switch off Below 1 V D27-9 (INDL) - Body ground Ignition switch off Below 1 V NG: REPLACE SEAT HEATER SWITCH OK: GO TO NEXT STEP
4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - SEAT HEATER SWITCH) Disconnect the connector from A/C amplifier. Disconnect the connector from the seat heater switch. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D37-6 (SCRI) - D27-10 (INDR) Always Below 1 D37-4 (SCLI) - D27-9 (INDL) Always Below 1 D37-6 (SCRI) - D27-10 (INDR) Always 10 k or higher D37-4 (SCLI) - D27-9 (INDL) Always 10 k or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AIR CONDITIONING AMPLIFIER

AUTO, OFF, TEMP UP (+), TEMP DOWN (-) switches are located on the steering pad switch. The resistance of the steering pad switch changes in accordance with switch operation. The heater control panel outputs voltage to the steering pad switch and reads voltage changes according to the resistance changes with switch operation.

Scheme 152

Scheme 153

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Scheme 157

1. INSPECT HEATER CONTROL PANEL (ADI1 - SG) Remove the heater control panel LH with connectors still connected. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition E6-23 (ADI1) - E6-12 (SG) AUTO switch: ON Below 2.5 E6-23 (ADI1) - E6-12 (SG) OFF switch: ON 330 E6-23 (ADI1) - E6-12 (SG) TEMP+ switch: ON 1,010 E6-23 (ADI1) - E6-12 (SG) TEMP- switch: ON 3,210 NG: Go to step 2 OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000)
2. INSPECT STEERING PAD SWITCH ASSEMBLY (AC - EAC) Remove the steering pad switch assembly. Measure resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition A3 (AC1) - A2 (EAC) AUTO switch: ON Below 2.5 A3 (AC1) - A2 (EAC) OFF switch: ON 330 A3 (AC1) - A2 (EAC) TEMP+ switch: ON 1,010 A3 (AC1) - A2 (EAC) TEMP- switch: ON 3,210 NG: REPLACE STEERING PAD SWITCH ASSEMBLY OK: GO TO NEXT STEP
3. INSPECT SPIRAL CABLE SUB-ASSEMBLY Disconnect the connector from spiral cable sub-assembly. Measure resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D15-10 (AC1) - A-3 (AC1) Always Below 1 D15-9 (EAC) - A-2 (EAC) Always Below 1 NG: REPLACE SPIRAL CABLE SUB-ASSEMBLY OK: GO TO NEXT STEP
4. CHECK HARNESS AND CONNECTOR (HEATER CONTROL PANEL LH - SPIRAL CABLE SUB-ASSEMBLY) Disconnect the connector from heater control panel LH. Disconnect the connector from the spiral cable sub-assembly. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection Condition Specified condition E6-23 (ADI1) - D15-10 (AC1) Always Below 1 E6-12 (SG) - D15-9 (EAC) Always Below 1 E6-23 (ADI1) - D15-10 (AC1) Always 10 k or higher E6-12 (SG) - D15-9 (EAC) Always 10 k or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000)

The main power source is supplied to the A/C amplifier when the ignition switch is turned to the on (IG). The power source supplied is used for operating the A/C amplifier and servomotor, etc.

Scheme 158

This is back-up power source circuit for the A/C amplifier. Power is supplied even when turning the ignition switch off and is used for diagnostic trouble code memory, etc.

Scheme 159

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Scheme 161

1. INSPECT FUSE (A/C) Remove the A/C fuse from the instrument panel J/B. Measure the resistance according to the value(s) in the table blow. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester item Condition Specified condition A/C fuse Always Below 1 NG: REPLACE FUSE (A/C) OK: GO TO NEXT STEP
2. CHECK HARNESS AND CONNECTOR (+B - BODY GROUND) Remove the A/C amplifier and disconnect the connector. Measure the voltage according to the value(s) in the table blow. Voltage TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D37-1 (B) - Body ground Always 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000)

The heater control panel switch operation signal to the A/C amplifier.

Scheme 162

Scheme 163

Scheme 164

1. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - HEATER CONTROL PANEL LH) Disconnect the connector from heater control panel LH. Disconnect the connector from the A/C amplifier. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION CONDITION AND SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition D37-22 (LIN1) - E6-19 (TX+) Always Below 1 D37-22 (LIN1) - E6-19 (TX+) Always 10 k or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN «PROBLEM SYMPTOMS TABLE»(ref-245146-S29784606012006102400000)

Scheme 165

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Scheme 174

1. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET This is a method in which trouble is located by using a manifold gauge set. Read the manifold gauge pressure when the following conditions are established. Test conditions: Temperature at the air inlet with the switch set at RECIRC is 30 to 35°C (86 to 95°F) Engine is running at 1500 rpm Blower sped control switch is in the "HI" position Temperature control dial is in the "COOL" position A/C switch is ON Doors fully open The refrigeration system functions normally. Gauge reading: Low pressure side: 0.15 to 0.25 MPa (1.5 to 2.5 kgf/cm 2 , 21.3 to 35.6 psi) High pressure side: 1.37 to 1.57 MPa (14 to 16 kgf/cm 2 , 199 to 228 psi) Moisture present in refrigeration system. SYMPTOM DESCRIPTION Symptom Probable cause Diagnosis Corrective Actions During operation, pressure on low pressure side cycles between normal and vacuum. Moisture in refrigeration system freezes at expansion valve orifice causing a temporary stop of cycle, however, when it melts, normal state is restored. Dryer in oversaturated state Moisture in refrigeration system freezes at expansion valve orifice and blocks circulation of refrigerant Replace condenser Remove moisture in cycle by repeatedly evacuating air Supply a proper amount of new refrigerant Insufficient cooling SYMPTOM DESCRIPTION Symptom Probable cause Diagnosis Corrective Actions Pressure low on both low and high pressure sides Insufficient cooling performance Gas leakage in refrigeration system Insufficient refrigerant Refrigerant leaking Check for gas leakage and repair if necessary Supply a proper amount of new refrigerant If indicated pressure value is close to 0 when connected to the gauge, create the vacuum after inspecting and repairing the location of leak Poor circulation of refrigerant SYMPTOM DESCRIPTION Symptom Probable cause Diagnosis Corrective Actions Pressure low on both low and high pressure sides Frost on pipe from condenser to unit Refrigerant flow obstructed by dirt in receiver Receiver clogged Replace condenser Refrigerant does not circulate. SYMPTOM DESCRIPTION Symptom Probable cause Diagnosis Corrective Actions Vacuum indicated on low pressure side, very low pressure indicated on high pressure side Frost or condensation seen on piping on both sides of cooler condenser core or cooler expansion value Refrigerant flow obstructed by moisture or dirt in refrigeration system Refrigerant flow obstructed by gas leaked from expansion valve Refrigerant does not circulate Check expansion valve Clean out dirt in expansion valve by blowing air Replace condenser Evaporate air and supply a proper amount of new refrigerant For gas leakage from expansion valve, replace expansion valve Refrigerant overcharged or insufficient cooling of condenser SYMPTOM DESCRIPTION Symptom Probable cause Diagnosis Corrective Actions Pressure too high on both low and high pressure sides Unable to develop sufficient performance due to excessive use of refrigeration system Insufficient cooling of condenser Excessive refrigerant in cycle --> too much refrigerant supplied Condenser cooling insufficient --> condenser fins clogged at cooling fan Clean condenser *1 Check cooling fan with cooling fan motor operated *2 If (*1) and (*2) are in normal state, check the amount of refrigerant and supply a proper amount of refrigerant Air present in refrigeration system SYMPTOM DESCRIPTION Symptom Probable Cause Diagnosis Corrective Actions Pressure too high on both low and high pressure sides The low pressure piping too hot to touch Air in system Air present in refrigeration system Insufficient vacuum purging Check compressor oil to see if it is dirty or insufficient Evacuate air and supply new refrigerant Expansion valve malfunction SYMPTOM DESCRIPTION Symptom Probable cause Diagnosis Corrective Actions Pressure too high on both low and high pressure sides Frost or a large amount of condensation on piping on low pressure side Trouble in expansion valve Excessive refrigerant in low pressure piping Expansion valve opened too wide Check expansion valve Defective compressor SYMPTOM DESCRIPTION Symptom Probable cause Diagnosis Corrective Actions Pressure too high on low pressure sides Pressure too low on high pressure sides Internal leak in compressor Compression failure Leakage from damaged valve or broken sliding parts Repair or replace compressor Gauge readings (Reference)

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Scheme 176

1. DISCHARGE REFRIGERANT FROM REFRIGERATION SYSTEM Start up the engine. Turn the A/C switch on. Operate the cooler compressor at an engine rpm of approximately 1,000 for 5 to 6 minutes to circulate the refrigerant and collect compressor oil remaining in each component into the cooler compressor as much as possible. Stop the engine. Using SST, let the refrigerant gas out. SST 07110-58060 (07117-58080, 07117-58090, 07117-78050, 07117-88060, 07117-88070, 07117-88080)
2. CHARGE REFRIGERANT Perform vacuum purging using a vacuum pump. Charge refrigerant HFC-134a (R134a) Specified amount: 450 to 550 g (15.9 to 19.4oz.) SST 07110-58060 (07117-58060, 07117-58070, 07117-58080, 07117-58090, 07117-78050, 07117-88060, 07117-88070, 07117-88080) NOTE: Do not operate the cooler compressor before charging refrigerant as the cooler compressor does not work properly without any refrigerant, which causes the compressor to overheat. HINT: Prepare a service can to recharge refrigerant if using the refrigerant gas collected with the freon collection / recycling device because the collective rate of the device is approximately 90%.
3. WARM UP ENGINE Warm up the engine at less than 1,850 rpm for 2 minutes or more after charging refrigerant. NOTE: Be sure to warm up the compressor before turning the A/C switch on after removing and installing the cooler refrigerant lines (including the compressor), to prevent damage to the compressor.
4. CHECK FOR LEAKAGE OF REFRIGERANT After recharging refrigerant gas, check for leakage of refrigerant gas using a halogen leak detector. Carry out under the following conditions: Stop the engine. Secure good ventilation (the gas leak detector may react to volatile gases which are not refrigerant, such as evaporated gasoline and exhaust gas). Repeat the test 2 or 3 times. Make sure that there is some refrigerant remaining in the refrigeration system. When the compressor is off: approx. 392 to 588 kPa (4 to 6 kgf/cm 2 , 57 to 85 psi) Using a gas leak detector, check for leakage of the refrigerant line. Bring the gas leak detector close to the drain hose with the detector's power off. HINT: After the blower motor has stopped, let the cooling unit stand for more than 15 minutes. Bring the gas leak detector sensor under the drain hose. When bringing the gas leak detector close to the drain hose, make sure that the gas leak detector does not react to volatile gases. If such reaction is unavoidable, the vehicle must be lifted up. If a gas leak is not detected on the drain hose, remove the blower motor control from the cooling unit. Insert the gas leak detector sensor into the unit and perform the test. Disconnect the pressure switch connector and leave it for approximately 20 minutes. Bring the gas leak detector close to the pressure switch and perform the test.

Scheme 177

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See also:
• BASIC INSPECTION
• PRECAUTION
• MULTIPLEX COMMUNICATION SYSTEM
• COMPONENTS