Problem Symptoms Table
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 | AIR CONDITIONING AMPLIFIER | |
| 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 | AIR CONDITIONING AMPLIFIER | |
| 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 | AIR CONDITIONING AMPLIFIER | |
| Air Flow Control: Insufficient air output | 1. Blower motor circuit | BLOWER MOTOR CIRCUIT |
| 2. A/C amplifier assembly | AIR CONDITIONING AMPLIFIER | |
| 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 | DTC B1441/41 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (PASSENGER SIDE) | |
| 5. Air mix damper position sensor circuit | DTC B1431/31 AIR MIX DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE) | |
| 6. Room temperature sensor circuit | DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT | |
| 7. Room humidity sensor circuit | DTC B1462/62 ROOM HUMIDITY SENSOR CIRCUIT | |
| 8. Ambient temperature sensor circuit | DTC B1412/12 [AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 9. w/ Motor compressor assembly | ELECTRIC INVERTER COMPRESSOR | |
| 10. A/C amplifier assembly | AIR CONDITIONING AMPLIFIER | |
| 11. Multiplex communication circuit | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Temperature Control: No warm air comes out | 1. Air mix damper control servomotor circuit | DTC B1441/41 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (PASSENGER SIDE) |
| 2. Air mix damper position sensor circuit | DTC B1431/31 AIR MIX DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE) | |
| 3. Ambient temperature sensor circuit | DTC B1412/12 [AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 4. Room temperature sensor circuit | DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT | |
| 5. Room humidity sensor circuit | DTC B1462/62 ROOM HUMIDITY SENSOR CIRCUIT | |
| 6. Evaporator temperature sensor circuit | DTC B1413/13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT | |
| 7. Heater relay circuit | HEATER RELAY CIRCUIT | |
| 8. Heater water pump circuit | HEATER WATER PUMP CIRCUIT | |
| 9. Heater radiator unit sub-assembly | DISASSEMBLY | |
| 10. A/C amplifier assembly | AIR CONDITIONING AMPLIFIER | |
| 11. Multiplex communication circuit | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Temperature Control: Output air is warmer or cooler than set temperature or response is slow | 1. Air mix damper control servomotor circuit | DTC B1441/41 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (PASSENGER SIDE) |
| 2. Air mix damper position sensor circuit | DTC B1431/31 AIR MIX DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE) | |
| 3. Room temperature sensor circuit | DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT | |
| 4. Room humidity sensor circuit | DTC B1462/62 ROOM HUMIDITY SENSOR CIRCUIT | |
| 5. Ambient temperature sensor circuit | DTC B1412/12 [AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 6. Solar sensor circuit | DTC B1421/21 SOLAR SENSOR CIRCUIT (PASSENGER SIDE) | |
| 7. A/C amplifier assembly | AIR CONDITIONING AMPLIFIER | |
| 8. 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 | DTC B1441/41 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (PASSENGER SIDE) | |
| 5. Air mix damper position sensor circuit | DTC B1431/31 AIR MIX DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE) | |
| 6. A/C amplifier assembly | AIR CONDITIONING AMPLIFIER | |
| No air inlet control | 1. Air inlet damper control servomotor circuit | RECIRCULATION DAMPER SERVO MOTOR CIRCUIT |
| 2. A/C amplifier assembly | AIR CONDITIONING AMPLIFIER | |
| 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 | AIR CONDITIONING AMPLIFIER | |
| Displayed set temperature value does not match with operation of temperature control switch | 1. A/C amplifier assembly | AIR CONDITIONING AMPLIFIER |
| Brightness does not change when rheostat volume or light control switch is adjusted | 1. Illumination light system | LIGHTING SYSTEM |
| 2. A/C amplifier assembly | AIR CONDITIONING AMPLIFIER | |
| Unable to access the diagnosis mode | 1. A/C amplifier assembly | AIR CONDITIONING 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 assembly | AIR CONDITIONING AMPLIFIER | |
| 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. Heater control housing sub-assembly (w/o Navigation system) | INTEGRATION CONTROL AND PANEL | |
| 4. A/C amplifier assembly | AIR CONDITIONING AMPLIFIER | |
| Rear heater does not operate | 1. Panel fuse | - |
| 2. Rear heater circuit | REAR HEATER CIRCUIT | |
| 3. Rear heater blower register | REAR HEATER ASSEMBLY |