FixVault

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