Air Conditioning: Diagnosis Lexus SC II рестайлинг

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

Use these procedures to troubleshoot the air conditioning system.

1. VEHICLE BROUGHT TO WORKSHOP
2. INSPECT BATTERY VOLTAGE Standard voltage: 10 to 14 V If the voltage is below 11V, recharge or replace the battery before proceeding.
3. CHECK COMMUNICATION FUNCTION OF LARGE-SCALE BODY MULTIPLEX COMMUNICATION SYSTEM (BEAN) Use the intelligent tester to check if the Multiplex Communication System (MPX) is functioning normally. Result RESULT CHART Result Proceed to MPX DTC is not output A MPX DTC is output B B: GO to «MULTIPLEX COMMUNICATION SYSTEM»(ref-283178-S21998405322008041900000) A: Go to next step.
4. CHECK CAN COMMUNICATION SYSTEM Use the intelligent tester to check if the CAN Communication System is functioning properly. Result RESULT CHART Result Proceed to CAN DTC is not output A CAN DTC is output B B: GO to «CAN COMMUNICATION SYSTEM»(ref-283179-S40362003722008041900000) A: Go to next step.
5. CHECK FOR DTC Check for DTCs and note any codes that are output. Delete the DTC. Recheck for DTCs. Based on the DTC output in above, try to force output of the audio system DTC by simulating the operation indicated by the DTC. Result RESULT CHART Result Proceed to DTC is not output A DTC is output B B: Go to step 8 A: Go to next step.
6. PROBLEM SYMPTOMS TABLE Result RESULT CHART Result Proceed to Fault is not listed in problem symptoms table A Fault is listed in problem symptoms table B B: Go to step 8 A: Go to next step.
7. OVERALL ANALYSIS AND TROUBLESHOOTING (see «ACTUATOR CHECK»(ref-283164-S34491143522008041900000) ) (see «DATA LIST / ACTIVE TEST»(ref-283164-S01150380602008041900000) ) (see «TERMINALS OF ECU»(ref-283164-S07786263782008041900000) ) (see «ON-VEHICLE INSPECTION»(ref-283164-S07064805202008041900000) ) Inspection
8. ADJUST, REPAIR OR REPLACE NEXT: END

PROBLEM SYMPTOMS TABLE

HINT

Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

Air conditioning system

PROBLEM SYMPTOMS CHART

Scheme 185

Scheme 186

Scheme 187

1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (Scheme 185): Identifying Connector Terminals Of ECU Measure the voltage and resistance of the connectors. VOLTAGE AND RESISTANCE SPECIFICATION CHART Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition IG (A10-1) - GND (A10-14) L - W-B Power source (IG) Ignition switch LOCK or ACC 0 V IG (A10-1) - GND (A10-14) L - W-B Power source (IG) Ignition switch ON 10 to 14 V BLW (A10-6) - GND (A10-14) L - W-B Blower motor speed control voltage Ignition switch ON, Blower switch OFF 10 to 14 V BLW (A10-6) - GND (A10-14) L - W-B Blower motor speed control voltage Ignition switch ON, Blower switch ON Pulse generation +B (A10-8) - GND (A10-14) W-R - W-B Power source (Back-up) Always 10 to 14 V ACC (A10-9) - GND (A10-14) B-O - W-B Power source (ACC) Ignition switch LOCK 0 V ACC (A10-9) - GND (A10-14) B-O - W-B Power source (ACC) Ignition switch ACC 10 to 14 V ILL+ (A10-10) - GND (A10-14) B-W - W-B Power supply for Illumination Light control switch OFF 0 V ILL+ (A10-10) - GND (A10-14) B-W - W-B Power supply for Illumination Light control switch Tail 10 to 14 V MPX+ (A10-13) - GND (A10-14) B - W-B Multiplex communication system Ignition switch ON Pulse generation GND (A10-14) - Body ground W-B - Body ground Ground for main power supply Always Below 1.0 ohms DGS (A9-4) - GND (A10-14) V - W-B Exhaust gas sensor signal After 30 seconds from ignition switch ON, Ambient temperature 10 to 35°C (50 to 95°F), Exhaust gas sensor: Exposed to exhaust gas Below 1.0 V DGS (A9-4) - GND (A10-14) V - W-B Exhaust gas sensor signal After 30 seconds from ignition switch ON, Ambient temperature 10 to 35°C (50 to 95°F), Exhaust gas sensor: Not exposed to exhaust gas 1.0 to 4.5 V TSPa (A9-5) - GND (A10-14) L - W-B Solar sensor signal (Passenger side) Ignition switch ON, Solar sensor: Covered with cloth Below 0.8 V TSPa (A9-5) - GND (A10-14) L - W-B Solar sensor signal (Passenger side) Ignition switch ON, Solar sensor: Exposed to electric light 0.8 to 4.3 V TR (A9-6) - SG-2 (A9-16) R - B-Y A/C room temperature sensor signal Ignition switch ON, Cabin temperature: 25°C (77°F) 1.8 to 2.2 V TR (A9-6) - SG-2 (A9-16) R - B-Y A/C room temperature sensor signal Ignition switch ON, Cabin temperature: 40°C (104°F) 1.2 to 1.6 V TPDr (A9-7) - SG-4 (A8-12) W - B Air mix damper position sensor signal (Driver side) Ignition switch ON, Driver temperature switch Max. WARM 0.5 to 1.5 V TPDr (A9-7) - SG-4 (A8-12) W - B Air mix damper position sensor signal (Driver side) Ignition switch ON, Driver temperature switch Max. COOL 3.5 to 4.5 V TP1 (A9-8) - SG-3 (A8-17) R - W-V Air inlet damper position sensor signal Ignition switch ON, R/F switch FRESH 1.0 V TP1 (A9-8) - SG-3 (A8-17) R - W-V Air inlet damper position sensor signal Ignition switch ON, R/F switch RECIRCULATION 4.0 V TPPa (A9-9) - SG-4 (A8-12) G - R-B Air mix damper position sensor signal (Passenger side) Ignition switch ON, Passenger temperature switch Max. WARM 0.5 to 1.5 V TPPa (A9-9) - SG-4 (A8-12) G - R-B Air mix damper position sensor signal (Passenger side) Ignition switch ON, Passenger temperature switch Max. COOL 3.5 to 4.5 V MPX- (A9-10) - GND (A10-14) R-L - W-B Multiplex communication system Ignition switch ON Pulse generation SG-1 (A9-13) - Body ground SB - Body ground Exhaust gas sensor ground Always Below 1.0 ohms TSDr (A9-14) - GND (A10-14) G - W-B Solar sensor signal (Driver side) Ignition switch ON, Solar sensor: Covered with cloth Below 0.8 V TSDr (A9-14) - GND (A10-14) G - W-B Solar sensor signal (Driver side) Ignition switch ON, Solar sensor: Exposed to electric light 0.8 to 4.3 V TE (A9-15) - SG-4 (A8-12) GR - B A/C evaporator temperature sensor signal Ignition switch ON, Evaporator temperature: 0°C (32°F) 2.1 to 2.5 V TE (A9-15) - SG-4 (A8-12) GR - B A/C evaporator temperature sensor signal Ignition switch ON, Evaporator temperature: 15°C (59°F) 1.6 to 2.0 V SG-2 (A9-16) - Body ground B-Y - Body ground Ground for A/C room temperature sensor Always Below 1.0 ohms TPO (A9-18) - SG-4 (A8-12) G-O - B Air outlet damper position sensor signal Ignition switch ON, Mode switch DEF 0.5 to 1.5 V TPO (A9-18) - SG-4 (A8-12) G-O - B Air outlet damper position sensor signal Ignition switch ON, Mode switch FACE 3.5 to 4.5 V S5-1 (A8-2) - SG-4 (A8-12) L - W-B Power supply for air mix damper position sensor Ignition switch ON 4.5 to 5.5 V S5-2 (A8-5) - SG-3 (A8-17) GR-V Power supply for air inlet damper position sensor Ignition switch ON 4.5 to 5.5 V FT2OP (A8-7) - GND (A10-14) W - W-B Lap-jet damper servo motor operation Start engine, Mode switch FOOT or BI-LEVEL, Metal top: Close 10 to 14 V FT2OP (A8-7) - GND (A10-14) W - W-B Lap-jet damper servo motor operation Start engine, Mode switch FOOT or BI-LEVEL, Metal top: Open 0 V AIF (A8-8) - GND (A10-14) W-L - W-B Air inlet damper servo motor operation voltage Ignition switch ON, R/F switch FRESH 10 to 14 V AIF (A8-8) - GND (A10-14) W-L - W-B Air inlet damper servo motor operation voltage Ignition switch ON, R/F switch RECIRCULATION Below 1.0 V AOF (A8-9) - GND (A10-14) G - W-B Air outlet damper servo motor operation voltage Ignition switch ON, Mode switch DEF Below 1.0 V AOF (A8-9) - GND (A10-14) G - W-B Air outlet damper servo motor operation voltage Ignition switch ON, Mode switch FACE 10 to 14 V AMHPa (A8-10) - GND (A10-14) G-B - W-B Air mix damper servo motor operation voltage (Passenger side) Ignition switch ON, Passenger temperature switch Max. COOL Below 1.0 V AMHPa (A8-10) - GND (A10-14) G-B - W-B Air mix damper servo motor operation voltage (Passenger side) Ignition switch ON, Passenger temperature switch WARM 10 to 14 V AMHDr (A8-11) - GND (A10-14) B-W - W-B Air mix damper servo motor operation voltage (Driver side) Ignition switch ON, Driver temperature switch Max. COOL Below 1.0 V AMHDr (A8-11) - GND (A10-14) B-W - W-B Air mix damper servo motor operation voltage (Driver side) Ignition switch ON, Driver temperature switch WARM 10 to 14 V SG-4 (A8-12)- Body ground B - Body ground Ground for air mix damper position sensor Always Below 1.0 ohms SG-3 (A8-17)- Body ground V - Body ground Ground for air inlet damper position sensor Always Below 1.0 ohms FT2CL (A8-18) - GND (A10-14) R - W-B Lap-jet damper servo motor operation Start engine, Mode switch FOOT or BL-LEVEL, Metal top: Open 10 to 14 V FT2CL (A8-18) - GND (A10-14) R - W-B Lap-jet damper servo motor operation Start engine, Mode switch FOOT or BI-LEVEL, Metal top: Close 0 V AIR (A8-19) - GND (A10-14) R-B - W-B Air inlet damper servo motor operation voltage Ignition switch ON, R/F switch RECIRCULATION 10 to 14 V AIR (A8-19) - GND (A10-14) R-B - W-B Air inlet damper servo motor operation voltage Ignition switch ON, R/F switch FRESH Below 1.0 V AOD (A8-20) - GND (A10-14) G-Y - W-B Air outlet damper servo motor operation voltage Ignition switch ON, Mode switch FACE Below 1.0 V AOD (A8-20) - GND (A10-14) G-Y - W-B Air outlet damper servo motor operation voltage Ignition switch ON, Mode switch DEF 10 to 14 V AMCPa (A8-21) - GND (A10-14) G-W - W-B Air mix damper servo motor operation voltage (Passenger side) Ignition switch ON, Passenger temperature switch Max. WARM Below 1.0 V AMCPa (A8-21) - GND (A10-14) G-W - W-B Air mix damper servo motor operation voltage (Passenger side) Ignition switch ON, Passenger temperature switch COOL 10 to 14 V AMCDr (A8-22) - GND (A10-14) B-O - W-B Air mix damper servo motor operation voltage (Driver side) Ignition switch ON, Driver temperature switch Max. WARM Below 1.0 V AMCDr (A8-22) - GND (A10-14) B-O - W-B Air mix damper servo motor operation voltage (Driver side) Ignition switch ON, Driver temperature switch COOL 10 to 14 V If the result is not as specified, the A/C amplifier may have a malfunction. CHECK ECM (Scheme 186): Identifying Connector Terminals Of ECM If the result is not as specified, the ECM may have a malfunction. Measure the voltage and resistance of the connectors. VOLTAGE AND RESISTANCE SPECIFICATION CHART Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition LCKI (E2-10) - E1 (E3-7) L-W - BR A/C lock sensor signal Engine is idling, A/C switch ON (Magnet clutch ON) Pulse generation (see 1 waveform 1) E1 (E3-7) - Body ground BR - Body ground Ground Always Below 1.0 ohms THW (E4-20) - E1 (E3-7) R-L - BR Engine coolant temperature sensor signal Engine coolant temperature 60 to 120°C (140 to 248°F) 0.2 to 1.0 V ACMG (E5-11) - E1 (E3-7) L-O - BR A/C magnet clutch relay signal Engine is idling, A/C switch ON (Magnet clutch ON) 0 to 1.5 V PR2 (E5-20) - E1 (E3-7) V - BR A/C pressure switch signal (Middle) Refrigerant pressure: Normal pressure Below 1.0 V PR2 (E5-20) - E1 (E3-7) V - BR A/C pressure switch signal (Middle) Refrigerant pressure: Less than 190 kPa (2.0 kgf/cm 2, 28 psi) or more than 3.14 MPa (32 kgf/cm 2, 455 psi) 10 to 14 V HP (E6-9) - E1 (E3-7) L-W - BR A/C pressure switch signal (High) Refrigerant pressure: Normal pressure Below 1.0 V HP (E6-9) - E1 (E3-7) L-W - BR A/C pressure switch signal (High) Refrigerant pressure: Abnormal pressure (more than 3.14 MPa (32 kgf/cm 2, 455 psi) 10 to 14 V TAM (E6-18) - E1 (E3-7) L-B - BR Ambient temperature sensor signal Ambient temperature: 25°C (77°F) 1.24 to 1.84 V Waveform 1: WAVEFORM REFERENCE CHART Item Contents Symbols (Terminal No.) LCKI (E2-10) - E1 (E3-7) Tool Setting 0.2 V/DIV., 20 msec/ DIV. Vehicle Condition Engine is idling, A/C switch ON (Scheme 187): Identifying Signal Waveform

Scheme 188

Scheme 189

Scheme 190

1. LIST OF OPERATION METHODS By operating the A/C control switches as shown in the diagram below, it is possible to enter the diagnostic check mode. (Scheme 188): DTC Check Mode Flow Chart
2. CHECK DLC3 The ECM uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with ISO 15031-3 and matches the ISO 15765-4 format. (Scheme 189): Identifying DLC3 Connector Terminals (CANL And BAT) CONNECTOR TERMINALS REFERENCE CHART Symbols (Terminal No.) Terminal Description Condition Specified Condition SIL (7) - SG (5) Bus "+" line During transmission Pulse generation BAT (16) - Body ground Battery positive Always 11 to 14 V CG (4) - Body ground Chassis ground Always Below 1 ohms SG (5) - Body ground Signal ground Always Below 1 ohms CANH (6) - CANL (14) CAN bus line Ignition switch OFF (1) 54 to 69 ohms CANH (6) - Battery positive (+) HIGH-level CAN bus line Ignition switch OFF (1) 200 ohms or higher CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch OFF (1) 200 ohms or higher CANL (14) - Battery positive (+) LOW-level CAN bus line Ignition switch OFF (1) 6 kohms or higher CANL (14) - CG (4) LOW-level CAN bus line Ignition switch OFF (1) 6 kohms or higher NOTE: (1) Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector. HINT: Connect the cable of the intelligent tester (with CAN VIM) to the DLC3, turn the ignition switch ON and attempt to use the tester. If the screen displays the message UNABLE TO CONNECT TO VEHICLE, there is a problem either with the vehicle or with the tester. If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle. If communication is still not possible when the tester is connected to another vehicle, the problem is probably in the tester itself. Consult the Service Department listed in the tester's instruction manual. (Scheme 190): Connecting Cable Of Intelligent Tester To DLC3

Scheme 191

Scheme 192

Scheme 193

Scheme 194

Scheme 195

Scheme 196

Scheme 197

Scheme 198

1. CHECK INDICATOR Turn the ignition switch ON while pressing the A/C control AUTO switch and Recirculation / Fresh (R/F) select switch simultaneously. (Scheme 191): Locating A/C Control Auto Switch And Recirculation Switch Check that the indicators turn on and off 4 times at 1 second intervals. HINT: After the indicator check is completed, the system enters the DTC check mode automatically. (Scheme 192): DTC Blinking Pattern
2. CHECK DTC (SENSOR CHECK) When not Using Intelligent Tester: After the indicator check is completed, the system enters the DTC check mode automatically. HINT: Press the OFF switch to cancel the check mode. In the sensor check mode, troubleshooting may be partially performed. Be sure to perform the actuator check and sensor check again. Read the DTCs displayed on the panel (temperature display). Refer to the list of «DTCS»(ref-283164-S29074989742008041900000) on when reading the codes. (Scheme 193): Identifying DTC Check Mode If a slower display speed is desired, press the driver temperature up switch to change the Step No. display. Each press of the switch will change the step by 1. (Scheme 194): Locating Driver Temperature Switch
3. CHECK DTC When Using Intelligent Tester: Connect the intelligent tester (with CAN VIM) to the DLC3. Turn the ignition switch ON. Read the DTCs by following the directions on the tester screen. HINT: Refer to the intelligent tester operator's manual for further details. (Scheme 195): Connecting Cable Of Intelligent Tester To DLC3
4. CLEAR DTC When not Using Intelligent Tester: There are 2 methods for clearing the DTC memory. During the sensor check, press the DEF switch and Rear DEF switch at the same time. (Scheme 196): Locating DEF Switch And Rear DEF Switch Pull out the A/C fuse in the passenger side junction block for 20 seconds or longer. (Scheme 197): Identifying A/C Fuse In Passenger Side Junction Block
5. CLEAR DTC When Using Intelligent Tester: Connect the intelligent tester (with CAN VIM) to the DLC3. Turn the ignition switch ON. Erase the DTCs by following the directions on the tester screen. HINT: Refer to the intelligent tester operator's manual for further details. (Scheme 198): Connecting Cable Of Intelligent Tester To DLC3

DATA LIST / ACTIVE TEST

1. READ DATA LIST HINT: Using the intelligent tester's DATA LIST allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the DATA LIST early in troubleshooting is one way to save time. Connect the intelligent tester (with CAN VIM) to the DLC3. Turn the ignition switch ON. Read the DATA LIST according to the display on the tester. DATA LIST Item Measurement Item / Display (Range) Normal Condition Diagnostic Note ROOM TEMP Room temperature sensor/ Min.: -6.5°C (20.3°F), Max.: 57.25°C (126.95°F) Actual room temperature is displayed - AMBI TEMP SENS Ambient temperature sensor / Min.: -23.3°C (-9.94°F), Max.: 65.95°C (150.71°F) Actual ambient temperature is displayed - EVAP TEMP Evaporator temperature sensor / Min.: -29.7°C (-21.46°F), Max.: 59.55°C (139.1°F) Actual evaporator temperature is displayed - SOLAR SENS-D Solar sensor (Driver side) / Min.: 0, Max.: 255 Increases as brightness increase - SOLAR SENS-P Solar sensor (Passenger side) / Min.: 0, Max.: 255 Increases as brightness increases - COOLANT TEMP Engine coolant temperature 1 Min.: 1.3°C (34.34°F), Max.: 90.55°C (194.99°F) Actual engine coolant temperature is displayed when the engine is warmed up - SET TEMP-D Set temperature (Driver side) / Min.: 0, Max.: 255 Actual set temperature is displayed (for Driver side) - SET TEMP-P Set temperature (Passenger side) / Min.: 0, Max.: 255 Actual set temperature is displayed (for Passenger side) - ESTIMATE TEMP-D Estimated temperature (Driver side) / Min.: -358.4°C (-613.12°F), Max.: 358.4°C (677.12°F) Actual estimated temperature is displayed (for Driver side) - ESTIMATE TEMP-P Estimated temperature (Passenger side) / Min.: -358.4°C (-613.12T), Max.: 358.4°C (677.12°F) Actual estimated temperature is displayed (for Passenger side) - A/M DAMP POS-D Air mix damper position (Driver side) / Min.: -14%, Max.: 113.5% Damper is at Max. COOL: -10.0% Damper is at Max. WARM: 110% - A/M DAMP POS-P Air mix damper position (Passenger side) / Min.: -14%, Max.: 113.5% Damper is at Max. COOL: -10.0% Damper is at Max. WARM: 110% - A/I DAMP POS Air inlet damper position / Min.: -14%, Max.: 113.5% Damper is at RECIRCULATION: 9.5% Damper is at FRESH: 100.0% Damper is at RECIRCULATION / FRESH: 44.0 to 99.5% - A/O DAMP POS Air outlet clamper position / Min.: -14%, Max.: 113.5% Damper is at FACE.: -10.0% Damper is at BI-LEVEL: 11.0% Damper is at FOOT: 52.0% Damper is at FOOT: 31.0% Damper is at FOOT / DEF: 74.5% Damper is at DEF: 110.0% - A/M DAMP TARG-D Air mix damper target position (Driver side) / Min.: -14%, Max.: 113.5% Damper is at Max. COOL: -10.0% Damper is at Max. WARM: 110% - A/M DAMP TARG-P Air mix damper target position (Passenger side) / Min.: -14%, Max.: 113.5% Damper is at Max. COOL: -10.0% Damper is at Max. WARM: 110% - A/I DAMP TARG Air inlet damper target position / Min.: -14%, Max.: 113.5% Damper is at RECIRCULATION: 9.5% Damper is at FRESH: 100.0% Damper is at RECIRCULATION / FRESH: 44.0 to 99.5% - A/O DAMP TARG Air outlet damper target position / Min.:-14%, Max.: 113.5% Damper is at FACE.: -10.0% Damper is at BI-LEVEL: 11.0% Damper is at FOOT: 52.0% Damper is at FOOT: 31.0% Damper is at FOOT / DEF: 74.5% Damper is at DEF: 110.0% - HAND FREE TEL Handsfree telephone / OFF or ON - - BLOWER LEVEL Blower motor speed level / Min.: 0, Max.: 31 Increases in the range between 0 and 31 as the speed increases - AMBI TEMP Adjusted ambient temperature / Min.: -30.8°C (-23.44°F), Max.: 50.8°C (123.44°F) - - EMISS GAS SENS Emission gas sensor / Min.: 0 V, Max.: 255 V Increases as the gas amount increases - ECM: DATA LIST Item Measurement Item / Display (Range) Normal Condition Diagnostic Note A/C SIG A/C signal / ON or OFF ON: A/C ON OFF: A/C OFF - A/C MAG CLUTCH A/C magnet clutch / ON or OFF ON: A/C magnet clutch ON OFF: A/C magnet clutch OFF
2. PERFORM ACTIVE TEST HINT: Performing the intelligent tester's ACTIVE TEST allows relays, VSV actuator and other items to be operated without removing any parts. Performing the ACTIVE TEST early in troubleshooting is one way to save time. The DATA LIST can be displayed during the ACTIVE TEST. Connect the intelligent tester (with CAN VIM) to the DLC3. Turn the ignition switch ON. Perform the ACTIVE TEST according to the display on the tester. A/C amplifier: ACTIVE TEST Item Test Details / Display (Range) Diagnostic Note ACTUATOR CHECK Actuator check OFF / ON Actuator check operation (see «ACTUATOR CHECK»(ref-283164-S34491143522008041900000) ) Passenger side junction block ECU: DATA LIST Item Test Details / Display (Range) Diagnostic Note HEATER RELAY Heater relay OFF / ON - ECM: DATA LIST Item Test Details / Display (Range) Diagnostic Note A/C MAG CLUTCH Magnet clutch relay ON / OFF Operating sound can be heard

DIAGNOSTIC TROUBLE CODE CHART

If a trouble code is displayed during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the "See page" below.

DIAGNOSTIC TROUBLE CODE CHART

Scheme 199

Scheme 200

Scheme 201

Scheme 202

1. CHECK PRESSURE SWITCH Disconnect the switch connector. Set the manifold gauge. Turn the ignition switch ON. Measure the resistance of the switch. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition 1 - 4 Refrigerant pressure is changed (Low and high pressure side) (Refer to illustration) Resistance is changed (Low and high pressure side) (Refer to illustration) 2 - 3 Refrigerant pressure is changed (Middle pressure side) (Refer to illustration) Resistance is changed (Middle pressure side) (Refer to illustration) (Scheme 199): Identifying Pressure Switch Connector (Scheme 200): Resistance Chart
2. INSPECT RELAY (Marking: IG1, HTR) Measure the resistance of the relay. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition 3 - 5 10 ohms or higher 3 - 5 Below 1 ohms (when battery voltage is applied to terminals 1 and 2) If the result is not as specified, replace the relay. (Scheme 201): Inspecting Relay (Marking: IG1, HTR)
3. INSPECT RELAY (Marking: ACC, A/C COMP) Measure the resistance of the relay. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition 3 - 5 10 ohms or higher 3 - 5 Below 1 ohms (when battery voltage is applied to terminals 1 and 2) If the result is not as specified, replace the relay. (Scheme 202): Inspecting Relay (Marking: ACC, A/C COMP)

Scheme 203

Scheme 204

1. CHECK ACTUATOR Turn the ignition switch ON while pressing the A/C control AUTO switch and Recirculation / Fresh (R/F) select switch simultaneously. (Scheme 203): Locating A/C Control Auto Switch And Recirculation / Fresh (R/F) Select Switch After entering the DTC check mode (Sensor Check Mode), press the R/F select switch. Each damper, motor and relay will automatically operate the actuator check at 1 second intervals from step No. 1 to No. 10 (see table below). At this time, check the temperature on the display and check the air flow with your hand. If a slower display speed is desired, press the temperature up switch to change the "step no." display. Each press of the switch will change the step no. by 1. (Scheme 204): Locating R/F Select Switch HINT: Codes are displayed as numbers from lowest to highest. To cancel the check mode, press the OFF switch. DISPLAY CODE CHART Step No. Display Code Conditions Blower Level Air Flow Vent Air Inlet Damper Magnet Clutch Air Mix Damper Lap-jet Damper 1 0 0 FACE FRESH OFF COOL Side (Fully closed) CLOSE 2 1 1 FACE FRESH OFF COOL Side (Fully closed) CLOSE 3 2 14 FACE RECIRCULATION/FRESH OFF COOL Side (Fully closed) CLOSE 4 3 14 FACE RECIRCULATION/FRESH ON COOL Side (Fully closed) CLOSE 5 4 14 FACE RECIRCULATION ON COOL / WARM (50% open) CLOSE 6 5 14 BI-LEVEL RECIRCULATION ON COOL/ WARM (50% open) CLOSE 7 6 14 FOOT/DEF RECIRCULATION ON WARM side (Fully opened) CLOSE 8 7 14 FOOT RECIRCULATION ON WARM side (Fully opened) OPEN 9 8 14 FOOT/DEF RECIRCULATION ON WARM side (Fully opened) OPEN 10 9 31 DEF RECIRCULATION ON WARM side (Fully opened) CLOSE

INSPECTION PROCEDURE

1. CHECK MULTIPLEX COMMUNICATION SYSTEM NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

ON-VEHICLE INSPECTION

1. CHECK COOLER CONDENSER ASSEMBLY Check the cooler condenser for dirt. If a fin of the cooler condenser is dirty, clean it with water and dry it with compressor air. NOTE: Do not damage the fin of the cooler condenser. If a fin of the cooler condenser is bent, straight it using a screwdriver or pliers.
2. CHECK CONDENSER FOR LEAKAGE OF REFRIGERANT Check pipe joints for gas leakage If gas leakage is detected in a joint, check the torque of the joint.

Scheme 205

Scheme 206

Scheme 207

Scheme 208

1. DISCHARGE REFRIGERANT FROM REFRIGERATION SYSTEM (See «REPLACEMENT»(ref-283164-S00538630992008041900000) )
2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
3. REMOVE NO. 1 AIR CLEANER INLET (See «REMOVAL»(ref-283156-S01143376352008041900000) )
4. REMOVE AIR CLEANER ASSEMBLY (See «REMOVAL»(ref-283156-S42868312982008041900000) )
5. DISCONNECT NO. 1 COOLER REFRIGERANT DISCHARGE HOSE Remove the bolt and disconnect the discharge hose from the cooler condenser. Remove the O-ring from the discharge hose. NOTE: Keep the system free from moisture or foreign matter. HINT: Cover the openings of the hoses with vinyl tape immediately after disconnecting. (Scheme 205): Identifying Cooler Condenser With Bolt
6. DISCONNECT COOLER REFRIGERANT LIQUID PIPE A Remove the bolt and disconnect the liquid pipe from the cooler condenser. Remove the O-ring from the liquid pipe. NOTE: Keep the system free from moisture or foreign matter. HINT: Cover the openings of the hoses with vinyl tape immediately after disconnecting. (Scheme 206): Identifying Cooler Refrigerant Liquid Pipe Bolt
7. REMOVE COOLER CONDENSER ASSEMBLY Remove the 2 bolts and 2 radiator upper supports. (Scheme 207): Identifying Radiator Upper Supports Bolts Remove the 2 bolts. Then slide the upper part of the radiator rearward to remove the cooler condenser. Remove the bolt and bracket. (Scheme 208): Removing Radiator Bolts And Brackets

Scheme 209

Scheme 210

1. REMOVE COOLER DRYER Using a 10 mm hexagon wrench, remove the cap and filter from the modulator. Remove the 2 O-rings from the cap. (Scheme 209): Removing Cap And Filter From Modulator Using needle nose pliers, remove the cooler dryer. (Scheme 210): Removing Cooler Dryer

Scheme 211

1. INSTALL COOLER DRYER Using needle nose pliers, install the cooler dryer. Install 2 new O-rings to the cap. Sufficiently apply compressor oil to the contact surfaces of the O-ring and the cap. Compressor oil: ND-OIL 8 or equivalent Using a 10 mm hexagon wrench, install the cap to the condenser. Torque: 12.3 N*m (125 kgf*cm, 9 in.*lbf) (Scheme 211): Locating Contact Surfaces Of O-Ring And Cap

Scheme 212

Scheme 213

Scheme 214

Scheme 215

1. INSTALL COOLER CONDENSER ASSEMBLY Install the bracket to the cooler condenser with the bolt. Torque: 9.8 N*m (100 kgf*cm, 7 ft.*lbf) Insert the lower support on the lower side of the cooler condenser into the crossmember. Install the cooler condenser with the 2 bolts. Torque: 9.8 N*m (100 kgf*cm, 7 ft.*lbf) (Scheme 212): Installing Bracket To Cooler Condenser With Bolt Install the radiator upper support to the upper part of the radiator with the 2 bolts. Torque: 9.8 N*m (100 kgf*cm, 7 ft.*lbf) (Scheme 213): Identifying Radiator Upper Support With Bolts
2. INSTALL COOLER REFRIGERANT LIQUID PIPE A Remove the vinyl tape attached to the pipe and condenser. Install a new O-ring to the liquid pipe. Sufficiently apply compressor oil to the O-ring and pipe joint. Compressor oil: ND-OIL 8 or equivalent Connect the liquid pipe to the cooler condenser with the bolt. Torque: 5.4 N*m (55 kgf*cm, 47 in.*lbf) (Scheme 214): Identifying Cooler Condenser With Bolt
3. INSTALL NO. 1 COOLER REFRIGERANT DISCHARGE HOSE Remove the vinyl tape attached to the hose and connecting part of the cooler condenser. Install a new O-ring to the discharge hose. Sufficiently apply compressor oil to the O-ring and hose joint. Compressor oil: ND-OIL 8 or equivalent Connect the discharge hose to the cooler condenser with the bolt. Torque: 5.4 N*m (55 kgf*cm, 47 in.*lbf) (Scheme 215): Identifying Cooler Condenser With Bolt
4. INSTALL AIR CLEANER ASSEMBLY (See «INSTALLATION»(ref-283156-S25307785002008041900000) )
5. INSTALL NO. 1 AIR CLEANER INLET (See «INSTALLATION»(ref-283156-S07406783162008041900000) )
6. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
7. PERFORM INITIALIZATION Perform initialization (see «INITIALIZATION»(ref-283168-S15934672912008041900000) ). NOTE: Certain systems need to be initialized after disconnecting and reconnecting the cable from the negative (-) battery terminal.
8. CHARGE REFRIGERANT (See «REPLACEMENT»(ref-283164-S00538630992008041900000) )
9. WARM UP ENGINE (See «REPLACEMENT»(ref-283164-S00538630992008041900000) )
10. CHECK FOR LEAKAGE OF REFRIGERANT (See «REPLACEMENT»(ref-283164-S00538630992008041900000) )

Scheme 216

1. INSPECT COOLER THERMISTOR (ROOM TEMPERATURE SENSOR) Measure the resistance of the thermistor. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition 1 - 2 25°C (77°F) 1.67 to 1.73 kohms 1 - 2 40°C (104°F) 0.8 to 0.45 kohms (Scheme 216): Identifying Room Temperature Sensor Connector Terminal If the result is not as specified, replace the thermistor. HINT: As the temperature increases, the resistance decreases.

Scheme 217

1. INSPECT COOLER THERMISTOR (AMBIENT TEMPERATURE SENSOR) Measure the resistance of the thermistor. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition 1 - 2 25°C (77°F) 1.62 to 1.79 kohms 1 - 2 40°C (104°F) 0.55 to 0.65 kohms (Scheme 217): Identifying Cooler Thermistor Connector Terminal If the result is not as specified, replace the thermistor. HINT: As the temperature increases, the resistance decreases.

Scheme 218

1. INSPECT COOLER SENSOR (SMOG VENTILATION THERMISTOR) Connect the positive (+) lead from the battery to the terminal 4 (IG) and the negative (-) lead to terminal 1 (GND). Apply battery positive voltage between terminals 1 and 4 for more than 30 seconds. Measure the resistance of the cooler. (Scheme 218): Identifying Smog Ventilation Sensor Connector Terminal Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition 2 (S.G) - 3 (GAS) 10 to 35°C (50 to 95°F) 5 to 100 kohms IF the result is not as specified, replace the cooler. HINT: When the cooler is exposed to the exhaust gas, the resistance goes down.

Scheme 219

Scheme 220

1. INSPECT NO. 1 COOLER THERMISTOR (A/C THERMISTOR) Measure the resistance between terminals 1 and 2 of the thermistor at each temperature, as shown in the chart. Check that the resistance is between the table's "maximum permissible value line" and "minimum permissible value line" for each temperature. (Scheme 219): Identifying No. 1 Cooler Thermistor Connector Terminal (A/C Thermistor) (Scheme 220): Temperature Resistance Graph If the result is not as specified, replace the thermistor.

Scheme 221

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
2. REMOVE AIR CONDITIONING CONTROL ASSEMBLY Pull the A/C control towards the rear of the vehicle and detach the 6 clips. Disconnect the 3 connectors and remove the A/C control. (Scheme 221): Identifying A/C Control Connectors

Scheme 222

Scheme 223

Scheme 224

Scheme 225

Scheme 226

Scheme 227

Scheme 228

Scheme 229

Scheme 230

1. REMOVE CONSOLE UPPER PANEL GARNISH FRONT Remove the 2 screws. Using a screwdriver, detach the 2 claws and remove the panel garnish from the A/C control. HINT: Tape the screwdriver tip before use. (Scheme 222): Identifying Panel Garnish From A/C Control Claws
2. REMOVE HEATER CONTROL HOUSING Remove the 6 screws. Using a screwdriver, detach the 4 claws. Then separate the heater control housing. HINT: Tape the screwdriver tip before use. (Scheme 223): Identifying Heater Control Housing Screws Disconnect the 2 cooler wires and remove the control housing (Scheme 224): Identifying Control Housing Cooler Wires
3. REMOVE AIR CONDITIONER AMPLIFIER ASSEMBLY Remove the 2 screws, cover plate and water protective sheet. (Scheme 225): Identifying Cover Plate And Water Protective Sheet Screws Remove the A/C amplifier. Remove the 2 cooler wires.
4. REMOVE NO. 1 COOLER WIRE Remove the cooler wire from the control switch.
5. REMOVE HEATER CONTROL BASE SUB-ASSEMBLY Remove the 2 screws. (Scheme 226): Identifying Heater Control Base Sub-Assembly Screws Using a screwdriver, detach the 7 claws as shown in the illustration. HINT: Lift up the black film. Use the screwdriver to detach the claws labeled A in the illustration. Tape the screwdriver tip before use. (Scheme 227): Identifying Claws Face the base upward as shown in the illustration. Slowly remove the base. NOTE: If the base is removed while it is facing down, the control knob may fall off. (Scheme 228): Removing Base
6. INSTALL MULTI-DISPLAY JUNCTION BLOCK (w/ Navigation System) Remove the 2 screws and multi-display junction block. (Scheme 229): Identifying Multi-Display Junction Block Screws
7. REMOVE HEATER CONTROL KNOB Remove the control knobs. (Scheme 230): Identifying Control Knobs

Scheme 231

Scheme 232

Scheme 233

Scheme 234

Scheme 235

Scheme 236

Scheme 237

Scheme 238

1. INSTALL HEATER CONTROL KNOB Install the control knobs as shown in the illustration. NOTE: If a heater control knob falls off after installation, it may have been installed backwards. (Scheme 231): Identifying Heater Control Knob
2. INSTALL MULTI-DISPLAY JUNCTION BLOCK (w/ Navigation System) Install the multi-display junction block with the 2 screws. (Scheme 232): Installing Multi-Display Junction Block With Screws
3. INSTALL HEATER CONTROL BASE SUB-ASSEMBLY Place the heater control base on the control switch. Push the base's 2 claws to attach the base to the switch, as shown in the illustration. HINT: Pushing the base's 2 claws will attach all 7 of its claws. (Scheme 233): Placing Heater Control Base On Control Switch Install the 2 screws. (Scheme 234): Installing Screws
4. INSTALL AIR CONDITIONING AMPLIFIER ASSEMBLY Connect the 2 cooler wires to the A/C amplifier. NOTE: Connect each wire so that the black line side of each wire is as shown in the illustration. Push on the locking parts of the connectors to secure the cooler wires. (Scheme 235): Connecting Cooler Wires To A/C Amplifier Install the A/C amplifier with the 2 screws, cover plate and water protective sheet. (Scheme 236): Identifying A/C Amplifier With Screws, Cover Plate And Water Protective Sheet NOTE: Be sure to fit the base to the groove on the cover plate. Insert the water-protective sheet into the heater control housing as shown in the illustration.
5. INSTALL HEATER CONTROL HOUSING Connect the 2 cooler wires to the heater control housing. Push on the locking parts of the connectors to secure the cooler wires. (Scheme 237): Identifying Locking Parts Of Connectors Attach the 4 claws and install the heater control housing with the 6 screws. (Scheme 238): Identifying Heater Control Housing With Screws

Scheme 239

1. INSTALL AIR CONDITIONING CONTROL ASSEMBLY Connect the 3 connectors and install the A/C control. Push the A/C control towards the front of the vehicle and attach the 6 clips. (Scheme 239): Identifying A/C Control Clips
2. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
3. PERFORM INITIALIZATION Perform initialization (see «INITIALIZATION»(ref-283168-S15934672912008041900000) ). NOTE: Certain systems need to be initialized after disconnecting and reconnecting the cable from the negative (-) battery terminal.