Problem Symptoms Table
Air Conditioning System
AIR CONDITIONING SYSTEM PROBLEM SYMPTOMS CHART
| Symptom | Suspected area | See |
|---|---|---|
| Entire A/C system does not operate | 1. IG power source circuit | IG POWER SOURCE CIRCUIT |
| 2. A/C amplifier assembly | REMOVAL | |
| Air Flow Control: No blower operation | 1. Heater relay circuit | HEATER RELAY CIRCUIT |
| 2. Blower motor circuit | BLOWER MOTOR CIRCUIT | |
| 3. A/C amplifier assembly | REMOVAL | |
| Air Flow Control: No blower control | 1. Heater relay circuit | HEATER RELAY CIRCUIT |
| 2. Blower motor circuit | BLOWER MOTOR CIRCUIT | |
| 3. A/C amplifier assembly | REMOVAL | |
| Air Flow Control: Insufficient air output | 1. Blower motor circuit | BLOWER MOTOR CIRCUIT |
| 2. A/C amplifier assembly | REMOVAL | |
| Temperature Control: No cool air comes out | 1. Volume of refrigerant | REFRIGERANT |
| 2. Refrigerant pressure | REFRIGERANT | |
| 3. Pressure switch circuit | DTC B1423/23 PRESSURE SENSOR CIRCUIT | |
| 4. Air mix damper control servomotor circuit (Driver side) | DTC B1446/46 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (DRIVER SIDE) | |
| 5. Air mix damper control servomotor circuit (Passenger side) | DTC B1441/41 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (PASSENGER SIDE) | |
| 6. Air mix damper position sensor circuit (Driver side) | DTC B1436/36 AIR MIX DAMPER POSITION SENSOR CIRCUIT (DRIVER SIDE) | |
| 7. Air mix damper position sensor circuit (Passenger side) | DTC B1431/31 AIR MIX DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE) | |
| 8. Room temperature sensor circuit. | DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT | |
| 9. Room humidity sensor circuit | DTC B1462/62 ROOM HUMIDITY SENSOR CIRCUIT | |
| 10. Ambient temperature sensor circuit | DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 11. Evaporator temperature sensor circuit | DTC B1413/13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT | |
| 12. A/C amplifier assembly | REMOVAL | |
| 13. Multiplex communication circuit | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Temperature Control: No warm air comes out | 1. Heater relay circuit | HEATER RELAY CIRCUIT |
| 2. Heater water pump circuit | HEATER WATER PUMP CIRCUIT | |
| 3. Air mix damper control servomotor circuit (Driver side) | DTC B1446/46 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (DRIVER SIDE) | |
| 4. Air mix damper control servomotor circuit (Passenger side) | DTC B1441/41 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (PASSENGER SIDE) | |
| 5. Air mix damper position sensor circuit (Driver side) | DTC B1436/36 AIR MIX DAMPER POSITION SENSOR CIRCUIT (DRIVER SIDE) | |
| 6. Air mix damper position sensor circuit (Passenger side) | DTC B1431/31 AIR MIX DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE) | |
| 7. Room temperature sensor circuit | DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT | |
| 8. Room humidity sensor circuit | DTC B1462/62 ROOM HUMIDITY SENSOR CIRCUIT | |
| 9. Ambient temperature sensor circuit | DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 10. Evaporator temperature sensor circuit | DTC B1413/13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT | |
| 11. Heater radiator unit sub-assembly | DISASSEMBLY | |
| 12.A/C amplifier assembly | REMOVAL | |
| 13. Multiplex communication circuit | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Temperature Control: Output air is warmer or cooler than set temperature or response is slow | 1. Volume of refrigerant | REFRIGERANT |
| 2. Refrigerant pressure | REFRIGERANT | |
| 3. Air mix damper control servomotor circuit (Driver side) | DTC B1446/46 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (DRIVER SIDE) | |
| 4. Air mix damper control servomotor circuit (Passenger side) | DTC B1441/41 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (PASSENGER SIDE) | |
| 5. Air mix damper position sensor circuit (Driver side) | DTC B1436/36 AIR MIX DAMPER POSITION SENSOR CIRCUIT (DRIVER SIDE) | |
| 6. Air mix damper position sensor circuit (Passenger side) | DTC B1431/31 AIR MIX DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE) | |
| 7. Room temperature sensor circuit | DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT | |
| 8. Room humidity sensor circuit | DTC B1462/62 ROOM HUMIDITY SENSOR CIRCUIT | |
| 9. Ambient temperature sensor circuit | DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 10. Solar sensor circuit (Driver side) | DTC B1424/24 SOLAR SENSOR CIRCUIT (DRIVER SIDE) | |
| 11. Solar sensor circuit (Passenger side) | DTC B1421/21 SOLAR SENSOR CIRCUIT (PASSENGER SIDE) | |
| 12. Expansion valve | DISASSEMBLY | |
| 13. Heater radiator unit sub-assembly | DISASSEMBLY | |
| 14. A/C amplifier assembly | REMOVAL | |
| 15. Multiplex communication circuit | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Temperature Control: No temperature control (only Max. cool or Max. warm) | 1. Room temperature sensor circuit | DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT |
| 2. Room humidity sensor circuit | DTC B1462/62 ROOM HUMIDITY SENSOR CIRCUIT | |
| 3. Ambient temperature sensor circuit | DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 4. Air mix damper control servomotor circuit (Driver side) | DTC B1446/46 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (DRIVER SIDE) | |
| 5. Air mix damper control servomotor circuit (Passenger side) | DTC B1441/41 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (PASSENGER SIDE) | |
| 6. Air mix damper position sensor circuit (Driver side) | DTC B1436/36 AIR MIX DAMPER POSITION SENSOR CIRCUIT (DRIVER SIDE) | |
| 7. Air mix damper position sensor circuit (Passenger side) | DTC B1431/31 AIR MIX DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE) | |
| 8. A/C amplifier assembly | REMOVAL | |
| No air inlet control | 1. Air inlet damper control servomotor circuit | DTC B1442/42 AIR INLET DAMPER CONTROL SERVO MOTOR CIRCUIT |
| 2. Air inlet damper position sensor circuit | DTC B1432/32 AIR INLET DAMPER POSITION SENSOR CIRCUIT | |
| 3. A/C amplifier assembly | REMOVAL | |
| No air outlet control | 1. Air outlet damper control servomotor circuit | DTC B1443/43 AIR OUTLET DAMPER CONTROL SERVO MOTOR CIRCUIT |
| 2. Air outlet damper position sensor circuit | DTC B1433/33 AIR OUTLET DAMPER POSITION SENSOR CIRCUIT | |
| 3. A/C amplifier assembly | REMOVAL | |
| Engine idle does not occur, or is continuous | 1. A/C amplifier assembly | REMOVAL |
| 2. Multiplex communication circuit | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Displayed set temperature value does not match with operation of temperature control switch | 1. A/C amplifier assembly | REMOVAL |
| Brightness does not change when rheostat volume or light control | 1. Illumination light system | HOW TO PROCEED WITH TROUBLESHOOTING |
| 2. A/C amplifier assembly | REMOVAL | |
| Unable to access the diagnosis mode | 1. A/C amplifier assembly | REMOVAL |
| DTC is 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 assembly | REMOVAL | |
| Unable to control A/C with the multi-display | 1. Multiplex communication circuit | HOW TO PROCEED WITH TROUBLESHOOTING |
| 2. Multi-display assembly (w/ Navigation System) | MULTI-DISPLAY | |
| 3. Integration control & panel assembly (w/o Navigation System) | REMOVAL | |
| 4.A/C amplifier assembly | REMOVAL |