Air Conditioning System (Diagnostic Codes & Circuit Tests): Diagnosis Lexus CT I

INSPECTION PROCEDURE

HINT

If the cabin temperature is approximately -18.6°C (-1.48°F) or lower, DTC B1411/11 may be output even though the system is normal.

Scheme 151

1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the power 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 Room Temperature Sensor Room temperature sensor / Min.: -6.5°C (20.3°F) Max.: 57.25°C (135.05°F) Actual cabin temperature displayed - 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 4 C --> See step 5 A: Go to next step
2. INSPECT ROOM TEMPERATURE SENSOR Remove the room temperature sensor. Disconnect the H79 room temperature sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H79-1 (+) - H79-2 (-) 10°C (50°F) 3.00 to 3.73 kohms H79-1 (+) - F25-2 (-) 15°C (59°F) 2.45 to 2.88 kohms H79-1 (+) - H79-2 (-) 20°C (68°F) 1.95 to 2.30 kohms H79-1 (+) - H79-2 (-) 25°C (77°F) 1.60 to 1.80 kohms H79-1 (+) - H79-2 (-) 30°C (86°F) 1.28 to 1.47 kohms H79-1 (+) - H79-2 (-) 35°C (95°F) 1.00 to 1.22 kohms H79-1 (+) - H79-2 (-) 40°C (104°F) 0.80 to 1.00 kohms H79-1 (+) - H79-2 (-) 45°C (113°F) 0.65 to 0.85 kohms H79-1 (+) - H79-2 (-) 50°C (122°F) 0.50 to 0.70 kohms H79-1 (+) - H79-2 (-) 55°C (131°F) 0.44 to 0.60 kohms H79-1 (+) - H79-2 (-) 60°C (140°F) 0.36 to 0.50 kohms NOTE: Hold the sensor only by 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 (Scheme 151) ). TEXT IN ILLUSTRATION *a Component without harness connected (Room Temperature Sensor) *b Sensing Portion *c Resistance (kohms) *d Allowable Range *e Temperature (°C (°F)) NG --> See step 6 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (ROOM TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER) Disconnect the H85 air conditioning amplifier assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H85-29 (TR) - H79-1 (+) Always Below 1 ohms H85-34 (SG-1) - H79-2 (-) Always Below 1 ohms H85-29 (TR) - Body ground Always 10 kohms or higher H85-34 (SG-1) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 5
4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-568603-S01769296392013072300000)
5. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-568733-S07880864152013072300000)
6. REPLACE ROOM TEMPERATURE SENSOR. Refer to «REMOVAL»(ref-568733-S26914605092013072300000)

HINT

If the ambient temperature is approximately -52.9°C (-63.22°F) or lower, DTC B1412/12 may be output even though the system is normal.

Scheme 152

1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the power 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 Ambient Temp Sensor Ambient temperature sensor / Min: -23.3°C (-9.94°F) Max: 65.95°C (150.71°F) Actual ambient temperature displayed - 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 4 C --> See step 5 A: Go to next step
2. INSPECT AMBIENT TEMPERATURE SENSOR Remove the ambient temperature sensor. Disconnect the A4 ambient temperature sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A4-1 - A4-2 10°C (50°F) 3.00 to 3.73 kohms A4-1 - A4-2 15°C (59°F) 2.45 to 2.88 kohms A4-1 - A4-2 20°C (68°F) 1.95 to 2.30 kohms A4-1 - A4-2 25°C (77°F) 1.60 to 1.80 kohms A4-1 - A4-2 30°C (86°F) 1.28 to 1.47 kohms A4-1 - A4-2 35°C (95°F) 1.00 to 1.22 kohms A4-1 - A4-2 40°C (104°F) 0.80 to 1.00 kohms A4-1 - A4-2 45°C (113°F) 0.65 to 0.85 kohms A4-1 - A4-2 50°C (122°F) 0.50 to 0.70 kohms A4-1 - A4-2 55°C (131°F) 0.44 to 0.60 kohms A4-1 - A4-2 60°C (140°F) 0.36 to 0.50 kohms NOTE: Hold the sensor only by 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 (Scheme 152) ). TEXT IN ILLUSTRATION *a Component without harness connected (Ambient Temperature Sensor) *b Sensing Portion *c Resistance (kohms) *d Allowable Range *e Temperature (°C (°F)) NG --> See step 6 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (AMBIENT TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER) Disconnect the H85 air conditioning amplifier assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H85-5 (TAM) - A4-1 Always Below 1 ohms H85-13 (SG-2) - A4-2 Always Below 1 ohms H85-5 (TAM) - Body ground Always 10 kohms or higher H85-13 (SG-2) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 5
4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-568603-S01769296392013072300000)
5. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-568733-S07880864152013072300000)
6. REPLACE AMBIENT TEMPERATURE SENSOR. Refer to «REMOVAL»(ref-568733-S14568113852013072300000)

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION . The hybrid control system and air conditioning system output DTCs separately. Inspect DTCs following the flow chart for the hybrid control system first if any DTCs from those systems are output simultaneously. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Scheme 153

1. CHECK CAN COMMUNICATION SYSTEM Using the Techstream to check if the CAN communication system is functioning normally. Result Result Proceed to CAN DTC is not output A CAN DTC is output B B --> See step 8 A: Go to next step
2. CHECK DIAGNOSTIC TROUBLE CODE (HYBRID CONTROL SYSTEM) Check if DTCs for the hybrid control system are output using the Techstream. OK Hybrid control system DTCs are not output. NG --> See step 5 OK: Go to next step
3. INSPECT ELECTRIC VEHICLE FUSE WARNING: Be sure to wear insulated gloves. Turn the power switch off. Remove the service plug grip. WARNING: Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed. NOTE: After removing the service plug grip, turning the power switch on (READY) may cause a malfunction. Do not turn the power switch on (READY) with the service plug grip removed. Remove the inverter terminal cover. NOTE: Be sure to prevent foreign objects or water from entering the inverter with converter assembly. Check that bolts A and B are tightened securely. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Item (Tester Connection) Condition Specified Condition Electric vehicle fuse (A - B) Always Below 1 ohms TEXT IN ILLUSTRATION *a Inverter with Converter Assembly *b Electric Vehicle Fuse NG --> REPLACE ELECTRIC VEHICLE FUSE OK: Go to next step
4. INSPECT NO. 2 ENGINE WIRE WARNING: Be sure to wear insulated gloves. Disconnect the No. 2 engine wire connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E1-1 (PE) - E2-2 (ACPE) Always Below 1 ohms E1-2 (PB) - E2-1 (ACPB) Always Below 1 ohms E1-1 (PE) - Body ground Always 10 kohms or higher E1-2 (PB) - Body ground Always 10 kohms or higher NG --> See step 7 OK --> See step 6
5. GO TO HYBRID CONTROL SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-568739-S08567487372013072300000)
6. REPLACE COMPRESSOR WITH MOTOR ASSEMBLY. Refer to «REMOVAL»(ref-568733-S30410220172013072300000)
7. REPLACE NO. 2 ENGINE WIRE. Refer to «REMOVAL»(ref-568590-S11950336722013072300000)
8. GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-568746-S19329885762013072300000)

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION . The hybrid control system and air conditioning system output DTCs separately. Inspect DTCs following the flow chart for the hybrid control system first if any DTCs from those systems are output simultaneously.

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION . The hybrid control system and air conditioning system output DTCs separately. Inspect DTCs following the flow chart for the hybrid control system first if any DTCs from those systems are output simultaneously. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Scheme 154

1. CHECK CAN COMMUNICATION SYSTEM Using the Techstream to check if the CAN communication system is functioning normally. Result Result Proceed to CAN DTC is not output A CAN DTC is output B B --> See step 8 A: Go to next step
2. CHECK DIAGNOSTIC TROUBLE CODE Check if DTCs for the air conditioning system and the hybrid control system are output using the Techstream. Result Result Proceed to Only DTC B1473 is output A DTCs B1473 and P3108 are output simultaneously (B1498 is not output) DTCs B1473 and B1498 are output simultaneously (P3108 is not output) B DTCs B1473, B1498 and P3108 are output simultaneously DTCs other than P3108 are output for hybrid control system C B --> See step 9 C --> See step 5 A: Go to next step
3. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - COMPRESSOR WITH MOTOR) WARNING: Do not disconnect the connector on the high-voltage side. Disconnect the connector from the power management control ECU. Disconnect the connector from the compressor with motor assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A19-20 (STB) - D12-4 (STBI) Always Below 1 ohms A19-20 (STB) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. INSPECT COMPRESSOR WITH MOTOR ASSEMBLY Reconnect the connector to the compressor with motor assembly. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A19-20 (STB) - Body ground Power switch on (IG) 11 to 14 V A19-20 (STB) - Body ground Power switch off Below 1 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Power Management Control ECU) NG --> See step 6 OK --> See step 7
5. GO TO HYBRID CONTROL SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-568739-S08567487372013072300000)
6. REPLACE COMPRESSOR WITH MOTOR ASSEMBLY. Refer to «REMOVAL»(ref-568733-S30410220172013072300000)
7. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to «REMOVAL»(ref-568756-S19873439732013072300000)
8. GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-568746-S19329885762013072300000)
9. GO TO DTC B1498/98. Refer to «DTC B1498/98: Communication Malfunction (A/C Inverter Local)»(ref-568759-S14467813932013072300000)

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION . The hybrid control system and air conditioning system output DTCs separately. Inspect DTCs following the flow chart for the hybrid control system first if any DTCs from those systems are output simultaneously.

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION . The hybrid control system and air conditioning system output DTCs separately. Inspect DTCs following the flow chart for the hybrid control system first if any DTCs from those systems are output simultaneously.

Scheme 155

1. CHECK CAN COMMUNICATION SYSTEM Using the Techstream to check if the CAN communication system is functioning normally. Result Result Proceed to CAN DTC is not output A CAN DTC is output B B --> See step 8 A: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Active Test. Check the operation by referring to the table below. ENGINE AND ECT Tester Display Test Part Control Range Diagnostic Note Control the Electric Cooling Fan Electric cooling fan OFF, ON - OK Electric cooling fan operates smoothly. NG --> See step 5 OK: Go to next step
3. CHECK REFRIGERANT PRESSURE Install a manifold gauge set. Refer to «ON-VEHICLE INSPECTION»(ref-568733-S20908219362013072300000) . Read the manifold gauge pressure when the following conditions are established. Prepare the vehicle according to the chart below. Item Condition Vehicle Doors All fully open Temperature Setting MAX COLD Blower Speed HI A/C switch ON R/F Switch RECIRCULATION (30 to 35°C (86 to 95°F)) Standard Pressure Low pressure side 150 to 250 kPa (1.5 to 2.5 kgf/cm 2 , 22 to 36 psi) High pressure side 1370 to 1570 kPa (14.0 to 16.0 kgf/cm 2 , 199 to 228 psi) NG --> See step 6 OK: Go to next step
4. READ OUTPUT DTC (DTC B1475/75) Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-568603-S03162055362013072300000) . Prepare the vehicle according to the table below. Item Condition Engine speed Engine idling Blower speed HI A/C switch ON Temperature setting MAX. COLD Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-568603-S03162055362013072300000) . Result Result Proceed to DTC B1475/75 is not output (normal) A DTC B1475/75 is output B NOTE: If the engine keeps idling when ambient temperature is high, the compressor may automatically stop to protect the inverter circuit, and DTC B1475/75 may be stored. B --> See step 7 A --> SYSTEM IS OK
5. GO TO COOLING FAN SYSTEM. Refer to «Cooling Fan Circuit»(ref-568758-S10256696072013072300000)
6. CHARGE REFRIGERANT. Refer to «REPLACEMENT»(ref-568733-S37903669672013072300000)
7. REPLACE COMPRESSOR WITH MOTOR ASSEMBLY. Refer to «REMOVAL»(ref-568733-S30410220172013072300000)
8. GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-568746-S19329885762013072300000)

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION . The hybrid control system and air conditioning system output DTCs separately. Inspect DTCs following the flow chart for the hybrid control system first if any DTCs from those systems are output simultaneously.

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION . The hybrid control system and air conditioning system output DTCs separately. Inspect DTCs following the flow chart for the hybrid control system first if any DTCs from those systems are output simultaneously.

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

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION . The hybrid control system and air conditioning system output DTCs separately. Inspect DTCs following the flow chart for the hybrid control system first if any DTCs from those systems are output simultaneously. Depending on the timing of the power supply to the 12 V power supply circuit and high-voltage circuit when the power switch is turned on (READY), an abnormal information signal may be output, causing this DTC to be stored. If the output DTC is a code that was memorized in the past, check the fuses and wire harnesses. If there is no malfunction, clear the DTC. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Scheme 156

1. CHECK CAN COMMUNICATION SYSTEM Using the Techstream to check if the CAN communication system is functioning normally. Result Result Proceed to CAN DTC is not output A CAN DTC is output B B --> See step 11 A: Go to next step
2. CHECK DIAGNOSTIC TROUBLE CODE Check if DTCs for the hybrid control system are output using the Techstream. Result Result Proceed to DTC is not output A Only DTC P3108 is output A DTCs other than P3108 are output B B --> See step 9 A: Go to next step
3. CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - BODY GROUND) WARNING: Do not disconnect the connector on the high-voltage side. Disconnect the connector from the compressor with motor assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D12-5 (GND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - BATTERY, GROUND) Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition D12-6 (IG1) - D12-5 (GND) Power switch on (IG) 11 to 14 V D12-6 (IG1) - D12-5 (GND) Power switch off Below 1 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - COMPRESSOR WITH MOTOR) Disconnect the connector from the power management control ECU. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D12-1 (CLK) - A19-19 (CLK) Always Below 1 ohms D12-2 (DIN) - A19-31 (ITE) Always Below 1 ohms D12-3 (DOUT) - A19-30 (ETI) Always Below 1 ohms D12-1 (CLK) - Body ground Always 10 kohms or higher D12-2 (DIN) - Body ground Always 10 kohms or higher D12-3 (DOUT) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. INSPECT ELECTRIC VEHICLE FUSE WARNING: Be sure to wear insulated gloves. Turn the power switch off. Remove the service plug grip. WARNING: Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed. NOTE: After removing the service plug grip, turning the power switch on (READY) may cause a malfunction. Do not turn the power switch on (READY) with the service plug grip removed. Remove the inverter terminal cover. NOTE: Be sure to prevent foreign objects or water from entering the inverter with converter assembly. Check that bolts A and B are tightened securely. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Item (Tester Connection) Condition Specified Condition Electric vehicle fuse (A - B) Always Below 1 ohms TEXT IN ILLUSTRATION *a Inverter with Converter Assembly *b Electric Vehicle Fuse NG --> REPLACE ELECTRIC VEHICLE FUSE OK: Go to next step
7. INSPECT NO. 2 ENGINE WIRE WARNING: Be sure to wear insulated gloves. Disconnect the No. 2 engine wire connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E1-1 (PE) - E2-2 (ACPE) Always Below 1 ohms E1-2 (PB) - E2-1 (ACPB) Always Below 1 ohms E1-1 (PE) - Body ground Always 10 kohms or higher E1-2 (PB) - Body ground Always 10 kohms or higher NG --> See step 12 OK: Go to next step
8. REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Replace the compressor with motor assembly. Refer to «REMOVAL»(ref-568733-S30410220172013072300000) . HINT: Since the compressor with motor assembly cannot be inspected while it is removed from the vehicle, replace the compressor with motor assembly with a new or a known good one and check that the condition returns to normal. Check for the DTC. Result Result Proceed to DTC B1498/98 is not output A DTC B1498/98 is output B B --> See step 10 A --> END (COMPRESSOR WITH MOTOR ASSEMBLY WAS DEFECTIVE)
9. GO TO HYBRID CONTROL SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-568739-S08567487372013072300000)
10. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to «REMOVAL»(ref-568756-S19873439732013072300000)
11. GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-568746-S19329885762013072300000)
12. REPLACE NO. 2 ENGINE WIRE. Refer to «REMOVAL»(ref-568590-S11950336722013072300000)

Scheme 157

The automatic light control sensor (solar sensor) is installed on the upper side of the instrument panel. It detects sunlight to control air conditioning AUTO mode. The output voltage from the automatic light control sensor (solar sensor) varies in accordance with the amount of sunlight. When the amount of sunlight increases, the output voltage increases. As the sunlight decreases, the output voltage decreases. The air conditioning amplifier assembly detects changes in the output voltage from the automatic light control sensor (solar sensor).

Scheme 158

HINT

If DTC B1244 is output together with other DTCs, troubleshoot DTC B1244 first. Refer to DTC B1244: Light Sensor Circuit Malfunction .

Scheme 159

Scheme 160

1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the power 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 / Min.: 0 Max.: 255 Driver side solar 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 I1 automatic light control sensor (solar sensor) connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition I1-6 (CLTB) - I1-3 (CLTE) Power switch off Below 1 V I1-6 (CLTB) - I1-3 (CLTE) Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Automatic Light Control Sensor (Solar Sensor)) NG --> See step 5 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (AUTOMATIC LIGHT CONTROL SENSOR - AIR CONDITIONING AMPLIFIER) Disconnect the H85 air conditioning amplifier assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H85-33 (TSD) - I1-1 (TSL) Always Below 1 ohms H85-33 (TSD) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. INSPECT AUTOMATIC LIGHT CONTROL SENSOR Remove the automatic light control sensor (solar sensor). Reconnect the I1 automatic light control sensor (solar sensor) connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition I1-1 (TSL) - I1-3 (CLTE) Sensor is exposed to electric light 0.8 to 4.3 V I1-1 (TSL) - I1-3 (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 automatic light control sensor (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: Use an incandescent light for inspection. Bring it within about 30 cm (11.8 in.) of the automatic light control sensor (solar sensor). As the inspection light is moved away from the sensor, the voltage decreases. TEXT IN ILLUSTRATION *a Component with harness connected (Automatic Light Control Sensor (Solar Sensor)) NG --> See step 8 OK --> See step 7
5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR) Disconnect the H16 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 H16-20 (CLTB) - I1-6 (CLTB) Always Blow 1 ohms H16-22 (CLTE) - I1-3 (CLTE) Always Blow 1 ohms H16-20 (CLTB) - Body ground Always 10 kohms or higher H16-22 (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»(ref-568603-S01769296392013072300000)
7. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-568733-S07880864152013072300000)
8. REPLACE AUTOMATIC LIGHT CONTROL SENSOR. Refer to «REMOVAL»(ref-568776-S07746920522013072300000)
9. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(ref-568756-S16773882952013072300000)

HINT

If DTC B1244 is output together with other DTCs, troubleshoot DTC B1244 first. Refer to DTC B1244: Light Sensor Circuit Malfunction .

Scheme 161

Scheme 162

1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the power 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 / Min.: 0 Max.: 255 Front passenger side solar 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 I1 automatic light control sensor (solar sensor) connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition I1-6 (CLTB) - I1-3 (CLTE) Power switch off Below 1 V I1-6 (CLTB) - I1-3 (CLTE) Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Automatic Light Control Sensor (Solar Sensor)) NG --> See step 5 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (AUTOMATIC LIGHT CONTROL SENSOR - AIR CONDITIONING AMPLIFIER) Disconnect the H85 air conditioning amplifier assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H85-32 (TSP) - I1-2 (TSR) Always Below 1 ohms H85-32 (TSP) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. INSPECT AUTOMATIC LIGHT CONTROL SENSOR Remove the automatic light control sensor (solar sensor). Reconnect the I1 automatic light control sensor (solar sensor) connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition I1-2 (TSR) - I1-3 (CLTE) Sensor is exposed to electric light 0.8 to 4.3 V I1-2 (TSR) - I1-3 (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 automatic light control sensor (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: Use an incandescent light for inspection. Bring it within about 30 cm (11.8 in.) of the automatic light control sensor (solar sensor). As the inspection light is moved away from the sensor, the voltage decreases. TEXT IN ILLUSTRATION *a Component with harness connected (Automatic Light Control Sensor (Solar Sensor)) NG --> See step 8 OK --> See step 7
5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR) Disconnect the H16 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 H16-20 (CLTB) - I1-6 (CLTB) Always Below 1 ohms H16-22 (CLTE) - I1-3 (CLTE) Always Below 1 ohms H16-20 (CLTB) - Body ground Always 10 kohms or higher H16-22 (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»(ref-568603-S01769296392013072300000)
7. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-568733-S07880864152013072300000)
8. REPLACE AUTOMATIC LIGHT CONTROL SENSOR. Refer to «REMOVAL»(ref-568776-S07746920522013072300000)
9. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to «REMOVAL»(ref-568756-S16773882952013072300000)

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Refer to PRECAUTION . Electrical insulation performance may decrease significantly if even a small amount of oil other than ND-OIL 11 is used (or enters) in the refrigerant cycle, causing the DTC to be output. If other oil is accidentally used and a DTC is output, collect the oil in the refrigerant cycle into the compressor and replace it with ND-OIL 11 to increase the ND-OIL 11 ratio amount. Replace the main components (evaporator, condenser, and compressor) if a large amount of oil other than ND-OIL 11 enters the system. Failing to do so may cause electrical insulation performance to remain low, causing the DTC to be output. The hybrid control system and air conditioning system output DTCs separately. Inspect DTCs following the flow chart for the hybrid control system first if any DTCs from those systems are output simultaneously. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT

If it can be confirmed that any compressor oil other than ND-OIL 11 has been used in the vehicle, replace the air conditioning cycle.

Scheme 163

Scheme 164

1. CHECK CAN COMMUNICATION SYSTEM Using the Techstream to check if the CAN communication system is functioning normally. Result Result Proceed to CAN DTC is not output A CAN DTC is output B B --> See step 6 A: Go to next step
2. INSPECT COMPRESSOR WITH MOTOR ASSEMBLY WARNING: Because the compressor has a high-voltage circuit, wear insulated gloves and pull out the service plug grip to cut off the high-voltage circuit before inspection. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-568603-S03162055362013072300000) . Turn the power switch on (READY). Prepare the vehicle according to the table below for 3 minutes. Item Condition Blower speed HI Temperature setting MAX COLD A/C ON Turn the power switch off. Remove the service plug grip. WARNING: Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed. NOTE: After removing the service plug grip, turning the power switch on (READY) may cause a malfunction. Do not turn the power switch on (READY) with the service plug grip removed. Disconnect the connector from the compressor with motor assembly. Using a megohmmeter, measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E1-1 (PE) - Body ground Always 2 Mohms or higher E1-2 (PB) - Body ground Always 2 Mohms or higher TEXT IN ILLUSTRATION *a Component without harness connected (Compressor with Motor Assembly) NG --> See step 4 OK: Go to next step
3. INSPECT AIR CONDITIONING CYCLE WARNING: Because the compressor has a high-voltage circuit, wear insulated gloves and pull out the service plug grip to cut off the high-voltage circuit before inspection. Reconnect the connector to the compressor with motor assembly. Install the service plug grip. Turn the power switch on (IG). Set the A/C temperature to 25°C (77°F) and the blower switch to LO and then operate the compressor for 10 minutes to circulate the refrigerant and collect as much compressor oil as possible in the compressor. Turn the power switch off. Using a spot cooler or other tools, cool down the compressor with motor assembly for 30 minutes, or leave the vehicle overnight before inspection. NOTE: Do not operate the compressor before inspection. Remove the service plug grip. WARNING: Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed. NOTE: After removing the service plug grip, turning the power switch on (READY) may cause a malfunction. Do not turn the power switch on (READY) with the service plug grip removed. Disconnect the connector from the compressor with motor assembly. Using a megohmmeter, measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E1-1 (PE) - Body ground Always 3 Mohms or higher E1-2 (PB) - Body ground Always 3 Mohms or higher NOTE: If the results are out of the specified range, replace the compressor without operating it. TEXT IN ILLUSTRATION *a Component without harness connected (Compressor with Motor Assembly) NG --> See step 5 OK --> See step 4
4. REPLACE COMPRESSOR WITH MOTOR ASSEMBLY. Refer to «REMOVAL»(ref-568733-S30410220172013072300000)
5. REPLACE AIR CONDITIONING CYCLE. Refer to «COMPONENTS»(ref-568733-S41723992072013072300000)
6. GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-568746-S19329885762013072300000)

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 165

Scheme 166

1. PERFORM ACTIVE TEST USING TECHSTREAM Connect the Techstream to the DLC3. Turn the power 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 with fan motor sub-assembly (blower motor) Min.: 0, Max.: 31 - OK Blower with fan motor sub-assembly (blower motor) operates and blower motor speed level changes. Result Result Proceed to OK A NG (Blower motor does not operate) B NG (Blower motor 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 WITH FAN MOTOR (BLOWER MOTOR) - BODY GROUND) Disconnect the H13 blower with fan motor sub-assembly (blower motor) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H13-3 (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 WITH FAN MOTOR (BLOWER MOTOR) - POWER SOURCE) Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition H13-1 (+B) - Body ground Power switch off 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - AIR CONDITIONING AMPLIFIER) Disconnect the H85 air conditioning amplifier assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H85-23 (BLW) - H13-2 (SI) Always Below 1 ohms H85-23 (BLW) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. INSPECT BLOWER WITH FAN MOTOR SUB-ASSEMBLY (BLOWER MOTOR) Reconnect the H13 blower with fan motor sub-assembly (blower motor) connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition H85-23 (BLW) - Body ground Power switch off 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. Reconnect the H85 air conditioning amplifier assembly connector. Turn the power switch on (IG). Set the blower speed to low. Measure the waveform between terminal H85-23 (BLW) of the air conditioning amplifier assembly and body ground. Item Content Tool setting 1 V/DIV., 500 μs/DIV. Vehicle condition Power switch on (IG) Blower set to low OK Waveform is as shown in the illustration. HINT: The waveform varies with the blower speed. 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»(ref-568603-S01769296392013072300000)
8. REPLACE BLOWER WITH FAN MOTOR SUB-ASSEMBLY. Refer to «REMOVAL»(ref-568733-S06543028762013072300000)
9. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to «REMOVAL»(ref-568733-S07880864152013072300000)

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

HINT

Turn the power switch on (IG) before inspection. Check the IG1 No. 1 relay or battery if the power source does not change to on (IG).

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