Problem Symptoms Table
If a normal system code is displayed during the DTC check but the problem still occurs, check the circuits for each problem symptom in the order given in the table below and proceed to the relevant troubleshooting article.
HINT:
Inspect the "Fuse" and "Relay" before confirming the suspected area as shown in the charts below.
Inspect each malfunction circuit in numerical order for the corresponding symptom.
If any malfunction still exists even after checking and confirming that all the circuits are normal, replace the ECU.
AIR CONDITIONING SYSTEM
AIR CONDITIONING SYSTEM REFERENCE
| Symptom | Suspected area | See |
|---|---|---|
| Whole functions of the A/C system does not operate | 1. IG power source circuit | IG POWER SOURCE CIRCUIT |
| 2. Heater control panel power source circuit | HEATER CONTROL PANEL POWER SOURCE CIRCUIT | |
| 3. Heater control switch circuit | HEATER CONTROL SWITCH CIRCUIT | |
| 4. LIN communication circuit | LIN COMMUNICATION CIRCUIT | |
| 5. Heater control panel LH | Heater Control Switch Circuit | |
| 6. A/C amplifier | - | |
| Air Flow Control: No blower operation | 1. IG power source circuit | IG POWER SOURCE CIRCUIT |
| 2. Blower motor circuit | BLOWER MOTOR CIRCUIT | |
| 3. Heater control panel power source circuit | HEATER CONTROL PANEL POWER SOURCE CIRCUIT | |
| 4. Heater control switch circuit | HEATER CONTROL SWITCH CIRCUIT | |
| 5. LIN communication circuit | LIN COMMUNICATION CIRCUIT | |
| 6. Heater control panel LH | REMOVAL | |
| 7. A/C amplifier | - | |
| Air Flow Control: No blower control | 1. Blower motor circuit | BLOWER MOTOR CIRCUIT |
| 2. Room temperature sensor circuit | DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT | |
| 3. Ambient temperature sensor circuit | DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 4. Solar sensor circuit (Driver side) | DTC B1424/24 SOLAR SENSOR CIRCUIT (DRIVER SIDE) | |
| 5. Solar sensor circuit (Passenger side) | DTC B1421/21 SOLAR SENSOR CIRCUIT (PASSENGER SIDE) | |
| 6. A/C amplifier | - | |
| Air Flow Control: Insufficient air flow | Blower motor circuit | BLOWER MOTOR CIRCUIT |
| Temperature Control: No cool air comes out | 1. Blower motor circuit | BLOWER MOTOR CIRCUIT |
| 2. Air mix control servo motor circuit (Driver side) | DTC B1446/46 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT DTC B1446/46 (DRIVER SIDE) | |
| 3. Air mix control servo motor circuit (Passenger side) | DTC B1441/41 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (PASSENGER SIDE) | |
| 4. Room temperature sensor circuit | DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT | |
| 5. Ambient temperature sensor circuit | DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 6. Evaporator temperature sensor circuit | DTC B1413/13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT | |
| 7. Pressure switch circuit | DTC B1423/23 PRESSURE SENSOR CIRCUIT | |
| 8. Compressor circuit | COMPRESSOR CIRCUIT | |
| 9. Compressor lock sensor circuit | DTC B1422/22 COMPRESSOR LOCK SENSOR CIRCUIT | |
| 10. Compressor solenoid circuit | DTC B1451/51 COMPRESSOR SOLENOID CIRCUIT | |
| 11. A/C amplifier | - | |
| Temperature Control: No Warm air comes out | 1. Steering pad switch circuit | STEERING PAD SWITCH CIRCUIT |
| 2. Air mix control servo motor circuit (Driver side) | DTC B1446/46 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT DTC B1446/46 (DRIVER SIDE) | |
| 3. Air mix control servo motor circuit (Passenger side) | DTC B1441/41 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (PASSENGER SIDE) | |
| 4. Room temperature sensor circuit | DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT | |
| 5. Ambient temperature sensor circuit | DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 6. Evaporator temperature sensor circuit | DTC B1413/13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT | |
| 7. Solar sensor circuit (Driver side) | DTC B1424/24 SOLAR SENSOR CIRCUIT (DRIVER SIDE) | |
| 8. Solar sensor circuit (Passenger side) | DTC B1421/21 SOLAR SENSOR CIRCUIT (PASSENGER SIDE) | |
| 9. A/C amplifier | - | |
| Temperature Control: Output is warmer or cooler than the set temperature or response is slow | 1. Steering pad switch circuit | STEERING PAD SWITCH CIRCUIT |
| 2. Air mix control servo motor circuit (Driver side) | DTC B1446/46 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT DTC B1446/46 (DRIVER SIDE) | |
| 3. Air mix control servo motor circuit (Passenger side) | DTC B1441/41 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (PASSENGER SIDE) | |
| 4. Room temperature sensor circuit | DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT | |
| 5. Ambient temperature sensor circuit | DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 6. Evaporator temperature sensor circuit | DTC B1413/13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT | |
| 7. Solar sensor circuit (Driver side) | DTC B1424/24 SOLAR SENSOR CIRCUIT (DRIVER SIDE) | |
| 8. Solar sensor circuit (Passenger side) | DTC B1421/21 SOLAR SENSOR CIRCUIT (PASSENGER SIDE) | |
| 9. A/C amplifier | - | |
| Temperature Control: No temperature control (only Max. cool or Max. warm) | 1. Steering pad switch circuit | STEERING PAD SWITCH CIRCUIT |
| 2. Air mix control servo motor circuit (Driver side) | DTC B1446/46 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT DTC B1446/46 (DRIVER SIDE) | |
| 3. Air mix control servo motor circuit (Passenger side) | DTC B1441/41 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (PASSENGER SIDE) | |
| 4. Room temperature sensor circuit | DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT | |
| 5. Ambient temperature sensor circuit | DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 6. Evaporator temperature sensor circuit | DTC B1413/13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT | |
| 7. Solar sensor circuit (Driver side) | DTC B1424/24 SOLAR SENSOR CIRCUIT (DRIVER SIDE) | |
| 8. Solar sensor circuit (Passenger side) | DTC B1421/21 SOLAR SENSOR CIRCUIT (PASSENGER SIDE) | |
| 9. A/C amplifier | - | |
| No air inlet control | 1. Air inlet control servo motor circuit | DTC B1442/42 AIR INLET DAMPER CONTROL SERVO MOTOR CIRCUIT |
| 2. A/C amplifier | - | |
| No air flow mode control | 1. Air outlet control servo motor circuit | DTC B1443/43 AIR OUTLET DAMPER CONTROL SERVO MOTOR CIRCUIT |
| 2. A/C amplifier | - | |
| Blinking of A/C indicator | Compressor solenoid circuit | DTC B1451/51 COMPRESSOR SOLENOID CIRCUIT |
| Diagnostic trouble code are not recorded. Set mode is cleared when ignition switch is turned OFF. | Back up power source circuit | BACK-UP POWER SOURCE CIRCUIT |
| Engine idle up dose not occur, or is continuous | 1. Compressor circuit | COMPRESSOR CIRCUIT |
| 2. Compressor lock sensor circuit | DTC B1422/22 COMPRESSOR LOCK SENSOR CIRCUIT | |
| 3. Compressor solenoid circuit | DTC B1451/51 COMPRESSOR SOLENOID CIRCUIT | |
| 4. A/C amplifier | - | |
| Set temperature value displayed does not much up with operation of temperature control switch. | 1. Heater control panel power source circuit | HEATER CONTROL PANEL POWER SOURCE CIRCUIT |
| 2. Heater control switch circuit | HEATER CONTROL SWITCH CIRCUIT | |
| 3. LIN communication circuit | LIN COMMUNICATION CIRCUIT | |
| 4. Heater control panel LH | Heater Control Switch Circuit | |
| 5. A/C amplifier | - | |
| The seat heater switch indicator does not come on. | 1. Seat heater control power source circuit | SEAT HEATER CONTROL POWER SOURCE CIRCUIT |
| 2. Seat heater indicator circuit | SEAT HEATER SWITCH INDICATOR CIRCUIT | |
| 3. Seat heater control sub-assembly | SE-60 | |
| 4. A/C amplifier | - | |
| Unable to access the diagnosis mode. | A/C amplifier | - |
| Unable to control A/C with the steering pad switch | 1. Steering pad switch circuit | STEERING PAD SWITCH CIRCUIT |
| 2. Heater control panel power source circuit | HEATER CONTROL PANEL POWER SOURCE CIRCUIT | |
| 3. LIN communication circuit | LIN COMMUNICATION CIRCUIT | |
| 4. Heater control panel LH | Heater Control Switch Circuit | |
| 5. A/C amplifier | - | |
| DTC not recorded. Set mode is cleared when IG switch is turned off. | 1. Back up power source circuit | BACK-UP POWER SOURCE CIRCUIT |
| 2. A/C amplifier | - | |
| Seat heater does not operate. | 1. Seat heater switch circuit | SEAT HEATER SWITCH CIRCUIT |
| 2. Seat heater control power source circuit | SEAT HEATER CONTROL POWER SOURCE CIRCUIT | |
| 3. Seat heater temperature sensor circuit (Driver side) | DTC B1463/63 DRIVER SIDE SEAT HEATER TEMPERATURE SENSOR CIRCUIT | |
| 4. Seat heater temperature sensor circuit (Passenger side) | DTC B1464/64 FRONT PASSENGER SIDE SEAT HEATER TEMPERATURE SENSOR CIRCUIT | |
| 5. Seat heater control sub-assembly | SE-60 | |
| 6. A/C amplifier | - | |
| Seat ventilators do not operate. | 1. Seat heater switch circuit | SEAT HEATER SWITCH CIRCUIT |
| 2. Seat heater control power source circuit | SEAT HEATER CONTROL POWER SOURCE CIRCUIT | |
| 3. Seat blower control circuit | SEAT BLOWER CONTROL CIRCUIT | |
| 4. Seat heater control sub-assembly | SE-60 | |
| 5. Seat climate control blower | SE-52 |