Problem Symptoms Table
WARNING: This page is about a different car, the 2006 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
FRONT AIR CONDITIONING
PROBLEM SYMPTOMS REFERENCE
| Symptom | Suspected area | Reference |
|---|---|---|
| All functions do not operate | 1. IG power source circuit | IG POWER SOURCE CIRCUIT |
| 2. A/C amplifier | AIR CONDITIONING AMPLIFIER (FOR REAR AIR CONDITIONING SYSTEM) | |
| 3. Navigation system | PROBLEM SYMPTOMS TABLE | |
| Air flow control: no blower operation | 1. Heater main relay | HEATER RELAY |
| 2. Blower motor circuit | BLOWER MOTOR CIRCUIT | |
| 3. A/C amplifier | AIR CONDITIONING AMPLIFIER (FOR REAR AIR CONDITIONING SYSTEM) | |
| 4. Blower motor control relay | BLOWER MOTOR CONTROL RELAY | |
| Air flow control: no blower control | 1. Blower motor circuit | BLOWER MOTOR CIRCUIT |
| 2. A/C amplifier | AIR CONDITIONING AMPLIFIER (FOR REAR AIR CONDITIONING SYSTEM) | |
| 3. Solar sensor circuit | DTC 21 SOLAR SENSOR CIRCUIT | |
| 4. Blower motor control relay | BLOWER MOTOR CONTROL RELAY | |
| Air flow control: insufficient air flow | 1. Blower motor circuit | BLOWER MOTOR CIRCUIT |
| 2. Blower motor control relay | BLOWER MOTOR CONTROL RELAY | |
| Temperature control: no cool air comes out | 1. Refrigerant volume | REFRIGERANT |
| 2. Refrigeration system inspection with manifold gauge set | REFRIGERANT | |
| 3. Compressor circuit | COMPRESSOR CIRCUIT | |
| 4. Pressure switch circuit | DTC 23 PRESSURE SWITCH CIRCUIT | |
| 5. Front air mix damper position sensor circuit | ROOM TEMPERATURE SENSOR (FOR FRONT AIR CONDITIONING SYSTEM) | |
| 6. Front air mix damper control servomotor circuit | ROOM TEMPERATURE SENSOR (FOR FRONT AIR CONDITIONING SYSTEM) | |
| 7. Front room temperature sensor circuit | ROOM TEMPERATURE SENSOR (FOR FRONT AIR CONDITIONING SYSTEM) | |
| 8. Ambient temperature sensor circuit | DTC 12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 9. A/C amplifier | AIR CONDITIONING AMPLIFIER (FOR REAR AIR CONDITIONING SYSTEM) | |
| 10. ECM | READINESS MONITOR DRIVE PATTERN | |
| Temperature control: no warm air comes out | 1. Front air mix damper position sensor circuit | ROOM TEMPERATURE SENSOR (FOR FRONT AIR CONDITIONING SYSTEM) |
| 2. Front air mix damper control servomotor circuit | ROOM TEMPERATURE SENSOR (FOR FRONT AIR CONDITIONING SYSTEM) | |
| 3. Front room temperature sensor circuit | ROOM TEMPERATURE SENSOR (FOR FRONT AIR CONDITIONING SYSTEM) | |
| 4. Ambient temperature sensor circuit | DTC 12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 5. Front evaporator temperature sensor circuit | DTC 13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT | |
| 6. A/C amplifier | AIR CONDITIONING AMPLIFIER (FOR REAR AIR CONDITIONING SYSTEM) | |
| Temperature control: output air is warmer or cooler than the set temperature, or response is slow | 1. Refrigerant volume | REFRIGERANT |
| 2. Refrigeration system inspection with manifold gauge set | REFRIGERANT | |
| 3. Solar sensor circuit | DTC 21 SOLAR SENSOR CIRCUIT | |
| 4. Front room temperature sensor circuit | ROOM TEMPERATURE SENSOR (FOR FRONT AIR CONDITIONING SYSTEM) | |
| 5. Ambient temperature sensor circuit | DTC 12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 6. Front evaporator temperature sensor circuit | DTC 13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT | |
| 7. Front air mix damper position sensor circuit | ROOM TEMPERATURE SENSOR (FOR FRONT AIR CONDITIONING SYSTEM) | |
| 8. Front air mix damper control servomotor circuit | ROOM TEMPERATURE SENSOR (FOR FRONT AIR CONDITIONING SYSTEM) | |
| 9. Front air inlet damper position sensor circuit | ROOM TEMPERATURE SENSOR (FOR FRONT AIR CONDITIONING SYSTEM) | |
| 10. Front air inlet damper control servomotor circuit | ROOM TEMPERATURE SENSOR (FOR FRONT AIR CONDITIONING SYSTEM) | |
| 11. Condenser | CONDENSER | |
| 12. A/C amplifier | AIR CONDITIONING AMPLIFIER (FOR REAR AIR CONDITIONING SYSTEM) | |
| 13. ECM | READINESS MONITOR DRIVE PATTERN | |
| Temperature control: no temperature control (only max. cool or max. warm) | 1. Front room temperature sensor circuit | ROOM TEMPERATURE SENSOR (FOR FRONT AIR CONDITIONING SYSTEM) |
| 2. Ambient temperature sensor circuit | DTC 12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 3. Front air mix damper position sensor circuit | ROOM TEMPERATURE SENSOR (FOR FRONT AIR CONDITIONING SYSTEM) | |
| 4. Front air mix damper control servomotor circuit | ROOM TEMPERATURE SENSOR (FOR FRONT AIR CONDITIONING SYSTEM) | |
| 5. A/C amplifier | AIR CONDITIONING AMPLIFIER (FOR REAR AIR CONDITIONING SYSTEM) | |
| No air inlet control | 1. Front air inlet damper position sensor circuit | ROOM TEMPERATURE SENSOR (FOR FRONT AIR CONDITIONING SYSTEM) |
| 2. Front air inlet damper control servomotor circuit | ROOM TEMPERATURE SENSOR (FOR FRONT AIR CONDITIONING SYSTEM) | |
| 3. A/C amplifier | AIR CONDITIONING AMPLIFIER (FOR REAR AIR CONDITIONING SYSTEM) | |
| No air flow control | 1. Air outlet damper position sensor circuit | AIR OUTLET CONTROL SERVO MOTOR |
| 2. Air outlet damper control servomotor circuit | AIR OUTLET CONTROL SERVO MOTOR | |
| 3. A/C amplifier | AIR CONDITIONING AMPLIFIER (FOR REAR AIR CONDITIONING SYSTEM) | |
| Engine idle up does not occur, or is continuous | 1. Compressor circuit | COMPRESSOR CIRCUIT |
| 2. ECM | READINESS MONITOR DRIVE PATTERN |
REAR AIR CONDITIONING
PROBLEM SYMPTOMS REFERENCE
| Symptom | Suspected area | Go To |
|---|---|---|
| All functions do not operate | 1. Rear A/C amplifier | AIR CONDITIONING AMPLIFIER (FOR REAR AIR CONDITIONING SYSTEM) |
| Air flow control: no blower operation | 1. Rear heater main relay | HEATER RELAY (FOR REAR HEATER) |
| 2. Rear blower motor | BLOWER UNIT | |
| 3. Rear power transistor | POWER TRANSISTOR (W/REAR COOLER) | |
| 4. Rear A/C amplifier | AIR CONDITIONING AMPLIFIER (FOR REAR AIR CONDITIONING SYSTEM) | |
| Air flow control: no blower control | 1. Rear heater main relay | HEATER RELAY (FOR REAR HEATER) |
| 2. Rear blower motor | BLOWER UNIT | |
| 3. Rear power transistor | POWER TRANSISTOR (W/REAR COOLER) | |
| 4. Rear A/C amplifier | AIR CONDITIONING AMPLIFIER (FOR REAR AIR CONDITIONING SYSTEM) | |
| 5. Solar sensor circuit | DTC 21 SOLAR SENSOR CIRCUIT | |
| Air flow control: insufficient air flow | 1. Rear blower motor | BLOWER UNIT |
| 2. Rear power transistor | POWER TRANSISTOR (W/REAR COOLER) | |
| Temperature control: no cool air comes out | 1. Refrigerant volume | REFRIGERANT |
| 2. Refrigeration system inspection with manifold gauge set | REFRIGERANT | |
| 3. Compressor circuit | COMPRESSOR CIRCUIT | |
| 4. Pressure switch circuit | DTC 23 PRESSURE SWITCH CIRCUIT | |
| 5. Rear air mix damper position sensor circuit | DTC 37 REAR AIR MIX DAMPER POSITION SENSOR CIRCUIT; DTC 47 REAR AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT | |
| 6. Rear air mix damper control servomotor circuit | DTC 47 REAR AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT | |
| 7. Rear room temperature sensor circuit | DTC 19 REAR ROOM TEMPERATURE SENSOR CIRCUIT | |
| 8. Ambient temperature sensor circuit | DTC 12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 9. Rear A/C amplifier | AIR CONDITIONING AMPLIFIER (FOR REAR AIR CONDITIONING SYSTEM) | |
| Temperature control: no warm air comes out | 1. Rear air mix damper position sensor circuit | DTC 37 REAR AIR MIX DAMPER POSITION SENSOR CIRCUIT; DTC 47 REAR AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT |
| 2. Rear air mix damper control servomotor circuit | DTC 47 REAR AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT | |
| 3. Rear room temperature sensor circuit | DTC 19 REAR ROOM TEMPERATURE SENSOR CIRCUIT | |
| 4. Ambient temperature sensor circuit | DTC 12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 5. Rear evaporator temperature sensor circuit | DTC 17 REAR EVAPORATOR TEMPERATURE SENSOR CIRCUIT | |
| 6. Rear A/C amplifier | AIR CONDITIONING AMPLIFIER (FOR REAR AIR CONDITIONING SYSTEM) | |
| Temperature control: output air is warmer or cooler than the set temperature or response is slow | 1. Refrigerant volume | REFRIGERANT |
| 2. Refrigeration system inspection with manifold gauge set | REFRIGERANT | |
| 3. Solar sensor circuit | DTC 21 SOLAR SENSOR CIRCUIT | |
| 4. Rear room temperature sensor circuit | DTC 19 REAR ROOM TEMPERATURE SENSOR CIRCUIT | |
| 5. Ambient temperature sensor circuit | DTC 12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 6. Rear evaporator temperature sensor circuit | DTC 17 REAR EVAPORATOR TEMPERATURE SENSOR CIRCUIT | |
| 7. Rear air mix damper position sensor circuit | DTC 37 REAR AIR MIX DAMPER POSITION SENSOR CIRCUIT; DTC 47 REAR AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT | |
| 8. Rear air mix damper control servomotor circuit | DTC 47 REAR AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT | |
| 9. Condenser | CONDENSER | |
| 10. Evaporator | CONDENSER | |
| 11. Heater radiator | REAR HEATER UNIT | |
| 12. Expansion valve | REAR COOLING UNIT | |
| 13. Rear A/C amplifier | AIR CONDITIONING AMPLIFIER (FOR REAR AIR CONDITIONING SYSTEM) | |
| Temperature control: no temperature control (only max. cool or max. warm) | 1. Rear room temperature sensor circuit | DTC 19 REAR ROOM TEMPERATURE SENSOR CIRCUIT |
| 2. Ambient temperature sensor circuit | DTC 12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 3. Rear air mix damper position sensor circuit | DTC 37 REAR AIR MIX DAMPER POSITION SENSOR CIRCUIT; DTC 47 REAR AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT | |
| 4. Rear air mix damper control servomotor circuit | DTC 47 REAR AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT | |
| 5. Rear A/C amplifier | AIR CONDITIONING AMPLIFIER (FOR REAR AIR CONDITIONING SYSTEM) |