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Air Conditioning System (Diagnostic Codes & Circuit Tests): Diagnosis Lexus ES XV60

Automatic HVAC System 5 illustrations ~2754 words

INSPECTION PROCEDURE

  1. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  2. If DTCs B1418/18 and B1461/61 are stored simultaneously, there may be a malfunction in the smog ventilation sensor power source related circuits.

HINT

If DTC B1423 and B14B8 are output at the same time, troubleshoot for DTC B1423 first.

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure. If DTCs B1418/18 and B1461/61 are stored simultaneously, there may be a malfunction in the smog ventilation sensor power source related circuits.

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Note. If the main body ECU (multiplex network body ECU) is replaced, refer to Registration. Refer to REGISTRATION [06/2012 - ] .

Scheme 199

Scheme 199: PROCEDURE
Scheme 199: PROCEDURE
  1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Air Conditioner / Data List. Check the value(s) by referring to the table below. AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Solar Sensor (D Side) Driver side solar sensor (automatic light control sensor) / Min.: 0 Max.: 255 Driver side solar sensor (automatic light control sensor) value increases as brightness increases - OK The display is as specified in the Normal Condition column. Result Result Proceed to NG A OK (When troubleshooting according to Problem Symptoms Table) B OK (When troubleshooting according to the DTC) C B --> See step 6 C --> See step 7 A: Go to next step
  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) Disconnect the J1 solar sensor (automatic light control sensor) connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition J1-6 (CLTB) - J1-3 (CLTE) Engine switch off Below 1 V J1-6 (CLTB) - J1-3 (CLTE) Engine switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Solar Sensor (Automatic Light Control Sensor)) NG --> See step 5 OK: Go to next step
  3. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR) - AIR CONDITIONING AMPLIFIER ASSEMBLY) Disconnect the H54 air conditioning amplifier assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H54-33 (TSD) - J1-1 (TSL) Always Below 1 ohms H54-33 (TSD) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  4. INSPECT SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR) Remove the solar sensor (automatic light control sensor). Refer to «REMOVAL [06/2012 - ]»(ref-598598-S03326281672014021400000) . Reconnect the J1 solar sensor (automatic light control sensor) connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition J1-1 (TSL) - J1-3 (CLTE) Sensor is subjected to electric light 0.8 to 4.3 V J1-1 (TSL) - J1-3 (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 negative (-) lead to terminal 1 and the positive (+) lead to terminal 3 of the solar sensor (automatic light control sensor). Do not bring the positive and negative tester probes too close to each other as a short circuit may occur. HINT: Use an incandescent light for inspection. Bring it within about 30 cm (11.8 in.) of the solar sensor (automatic light control sensor). As the inspection light is moved away from the sensor, the voltage decreases. TEXT IN ILLUSTRATION *a Component with harness connected (Solar Sensor (Automatic Light Control Sensor)) NG --> See step 8 OK --> See step 7
  5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR)) Disconnect the H10 main body ECU (multiplex network body ECU) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H10-20 (CLTB) - J1-6 (CLTB) Always Blow 1 ohms H10-22 (CLTE) - J1-3 (CLTE) Always Blow 1 ohms H10-20 (CLTB) - Body ground Always 10 kohms or higher H10-22 (CLTE) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 9
  6. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE [06/2012 - ]»(ref-598464-S25253580382014021400000)
  7. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL [06/2012 - ]»(ref-598598-S36763685372014021400000)
  8. REPLACE SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR). Refer to «REMOVAL [06/2012 - ]»(ref-598598-S03326281672014021400000)
  9. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL [06/2012 - ]»(ref-598640-S21213941222014021400000)

Note. If the main body ECU (multiplex network body ECU) is replaced, refer to Registration. Refer to REGISTRATION [06/2012 - ] .

Scheme 200

Scheme 200: PROCEDURE
Scheme 200: PROCEDURE
  1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Air Conditioner / Data List. Check the value(s) by referring to the table below. AIR CONDITIONER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Solar Sensor (P Side) Front passenger side solar sensor (automatic light control sensor) / Min.: 0 Max.: 255 Front passenger side solar sensor (automatic light control sensor) value increases as brightness increases - OK The display is as specified in the Normal Condition column. Result Result Proceed to NG A OK (When troubleshooting according to Problem Symptoms Table) B OK (When troubleshooting according to the DTC) C B --> See step 6 C --> See step 7 A: Go to next step
  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) Disconnect the J1 solar sensor (automatic light control sensor) connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition J1-6 (CLTB) - J1-3 (CLTE) Engine switch off Below 1 V J1-6 (CLTB) - J1-3 (CLTE) Engine switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Solar Sensor (Automatic Light Control Sensor)) NG --> See step 5 OK: Go to next step
  3. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR) - AIR CONDITIONING AMPLIFIER ASSEMBLY) Disconnect the H54 air conditioning amplifier assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H54-32 (TSP) - J1-2 (TSR) Always Below 1 ohms H54-32 (TSP) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  4. INSPECT SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR) Remove the solar sensor (automatic light control sensor). Refer to «REMOVAL [06/2012 - ]»(ref-598598-S03326281672014021400000) . Reconnect the J1 solar sensor (automatic light control sensor) connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition J1-2 (TSR) - J1-3 (CLTE) Sensor is subjected to electric light 0.8 to 4.3 V J1-2 (TSR) - J1-3 (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 negative (-) lead to terminal 2 and the positive (+) lead to terminal 3 of the solar sensor (automatic light control sensor). Do not bring the positive and negative tester probes too close to each other as a short circuit may occur. HINT: Use an incandescent light for inspection. Bring it within about 30 cm (11.8 in.) of the solar sensor (automatic light control sensor). As the inspection light is moved away from the sensor, the voltage decreases. TEXT IN ILLUSTRATION *a Component with harness connected (Solar Sensor (Automatic Light Control Sensor)) NG --> See step 8 OK --> See step 7
  5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR)) Disconnect the H10 main body ECU (multiplex network body ECU) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H10-20 (CLTB) - J1-6 (CLTB) Always Below 1 ohms H10-22 (CLTE) - J1-3 (CLTE) Always Below 1 ohms H10-20 (CLTB) - Body ground Always 10 kohms or higher H10-22 (CLTE) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 9
  6. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE [06/2012 - ]»(ref-598464-S25253580382014021400000)
  7. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL [06/2012 - ]»(ref-598598-S36763685372014021400000)
  8. REPLACE SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR). Refer to «REMOVAL [06/2012 - ]»(ref-598598-S03326281672014021400000)
  9. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL [06/2012 - ]»(ref-598640-S21213941222014021400000)

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT

If DTC B1423 and B14B8 are output at the same time, troubleshoot for DTC B1423 first.

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Scheme 201

Scheme 201: PROCEDURE
Scheme 201: PROCEDURE

Scheme 202

Scheme 202
Scheme 202
  1. PERFORM ACTIVE TEST USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Air Conditioner / Active Test. Check the operation by referring to the table below. AIR CONDITIONER Tester Display Test Part Control Range Diagnostic Note Blower Motor Blower motor with fan sub-assembly Min.: 0, Max.: 31 - Result Result Proceed to OK A NG (Blower motor with fan sub-assembly does not operate) B NG (Blower motor with fan sub-assembly operates but does not change speed) C B --> See step 2 C --> See step 6 A --> See step 7
  2. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - BODY GROUND) Disconnect the H53 blower motor with fan sub-assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H53-1 (GND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  3. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - BATTERY) Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition H53-3 (+B) - Body ground Always 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BLOWER MOTOR WITH FAN SUB-ASSEMBLY) Disconnect the H54 air conditioning amplifier assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H54-22 (BLW) - H53-2 (SI) Always Below 1 ohms H54-22 (BLW) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  5. INSPECT BLOWER MOTOR WITH FAN SUB-ASSEMBLY Reconnect the H53 blower motor with fan sub-assembly connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition H54-22 (BLW) - Body ground Always 4.5 to 5.5 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Air Conditioning Amplifier Assembly) NG --> See step 8 OK: Go to next step
  6. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY Remove the air conditioning amplifier assembly. Refer to «REMOVAL [06/2012 - ]»(ref-598598-S36763685372014021400000) . Reconnect the H54 air conditioning amplifier assembly connector. Turn the engine switch on (IG). Turn the blower switch on (LO). Measure the waveform between terminal H54-22 (BLW) of the air conditioning amplifier assembly and body ground. OK Waveform is similar to that shown in the illustration. HINT: The waveform varies with the blower speed. Item Content Tool setting 1 V/DIV., 500 μs./DIV. Vehicle condition Engine switch on (IG) Blower switch on (LO) TEXT IN ILLUSTRATION *a Component with harness connected (Air Conditioning Amplifier Assembly) NG --> See step 9 OK --> See step 8
  7. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE [06/2012 - ]»(ref-598464-S25253580382014021400000)
  8. REPLACE BLOWER MOTOR WITH FAN SUB-ASSEMBLY. Refer to «REMOVAL [06/2012 - ]»(ref-598598-S39903811082014021400000)
  9. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL [06/2012 - ]»(ref-598598-S36763685372014021400000)

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Scheme 203

Scheme 203: PROCEDURE
Scheme 203: PROCEDURE
  1. CHECK ENGINE ROOM JUNCTION BLOCK ASSEMBLY Using a voltmeter, check the signal reading of the engine room junction block assembly. Refer to «ON-VEHICLE INSPECTION [06/2012 - ]»(ref-598640-S13451181292014021400000) . OK A normal signal reading is output. NG --> See step 12 OK: Go to next step
  2. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY POWER SOURCE AND BODY GROUND) Remove the engine room junction block assembly from the engine room relay block and junction block assembly. Refer to «REMOVAL [06/2012 - ]»(ref-598640-S13233050932014021400000) . TEXT IN ILLUSTRATION *a Component without engine room junction block assembly connected (Engine Room Relay Block and Junction Block Assembly) - - Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A-1 (BATT) - Body ground Always 11 to 14 V B-1 (ALT) - Body ground Always 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1F-3 (GND1) - Body ground Always Below 1 ohms 1G-4 (GND2) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  3. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - MAGNETIC CLUTCH ASSEMBLY) Disconnect the D65 cooler compressor assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1M-1 (MGCT) - D65-3 (MG+) Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  4. INSPECT COOLER COMPRESSOR ASSEMBLY Disconnect the a2 magnetic clutch assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D65-3 (MG+) - a2-1 Always Below 1 ohms D65-3 (MG+) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Component without harness connected (Cooler Compressor Assembly) *b Component without harness connected (Magnetic Clutch Assembly) NG --> See step 10 OK: Go to next step
  5. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY Disconnect the H54 air conditioning amplifier assembly connector. Reconnect the engine room junction block assembly connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition H54-20 (MGC) - Body ground Engine switch off Below 1 V H54-20 (MGC) - Body ground Engine switch on (IG) 11 to 14 V NG --> See step 7 OK: Go to next step
  6. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY Reconnect the H54 air conditioning amplifier assembly connector. Measure the voltage and voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition H54-20 (MGC) - Body ground Engine switch on (IG) A/C switch: off 11 to 14 V H54-20 (MGC) - Body ground Engine switch on (IG) A/C switch: on Below 1 V TEXT IN ILLUSTRATION *a Component with harness connected (Air Conditioning Amplifier Assembly) NG --> See step 9 OK --> See step 8
  7. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - ENGINE ROOM JUNCTION BLOCK ASSEMBLY) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H54-20 (MGC) - 1F-9 (MCLS) Always Below 1 ohms H54-20 (MGC) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 11
  8. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE [06/2012 - ]»(ref-598464-S25253580382014021400000)
  9. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL [06/2012 - ]»(ref-598598-S36763685372014021400000)
  10. REPLACE COOLER COMPRESSOR ASSEMBLY. Refer to «REMOVAL [06/2012 - ]»(ref-598598-S15634803202014021400000)
  11. REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY. Refer to «REMOVAL [06/2012 - ]»(ref-598640-S13233050932014021400000)
  12. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (RESULT OF SIGNAL READING CHECK). Refer to «ON-VEHICLE INSPECTION [06/2012 - ] - Step 2»(ref-598640-S25328519152014021400000)

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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