Problem Symptoms Table
WARNING: This page is about a different car, the 2002 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
Use the table below to help you find the cause of the problem. The numbers indicate the priority of the likely cause of the problem. Check each part in order If necessary, replace these parts.
Problem Symptoms
| Symptom/Suspect Area | See | |
| Whole Functions Of A/C System Do Not Operate | ||
| A/C Fuse | CheckFuses | |
| A/C Control Assembly | AIR CONDITIONING CONTROL ASSEMBLY | |
| No Blower Operation | ||
| Heater Main Relay | HEATER MAIN RELAY | |
| Blower Motor | BLOWER MOTOR | |
| Blower Motor Control Relay | BLOWER MOTOR CONTROL RELAY | |
| A/C Control Assembly | AIR CONDITIONING CONTROL ASSEMBLY | |
| Wire Harness | Check Wiring Harness | |
| Insufficient Air Out | ||
| Blower Motor | BLOWER MOTOR | |
| No Cool Air Comes Out | ||
| Refrigerant Volumn | See Step 1 under ON VEHICLE INSPECTION. | |
| Drive Belt | DRIVE BELT | |
| Refrigerant Pressure | See Step 2 under ON-VEHICLE INSPECTION. | |
| Compressor | COMPRESSOR AND MAGNETIC CLUTCH | |
| Pressure Switch | PRESSURE SWITCH | |
| Igniter Circuit | Check Igniter Circuit | |
| Air Mix Servometer | See Step 1 under INSPECTION. | |
| Room Temp. Sensor | ROOM TEMPERATURE SENSOR | |
| Ambient Temp. Sensor | AMBIENT TEMPERATURE SENSOR | |
| A/C Control Assembly | AIR CONDITIONING CONTROL ASSEMBLY | |
| Wire Harness | Check Wiring Harness | |
| No Warm Air Comes Out | ||
| Engine Coolant Volume | - | |
| Air Mix Servomotor | See Step 1 under INSPECTION. | |
| Ambient Temp. Sensor | AMBIENT TEMPERATURE SENSOR | |
| Room Temp. Sensor | ROOM TEMPERATURE SENSOR | |
| A/C Control Assembly | AIR CONDITIONING CONTROL ASSEMBLY | |
| Heater Radiator | See Step 3 under ON-VEHICLE INSPECTION | |
| Output Air Is Warmer Or Cooler Than The Set Temperature Or Response Is Slow | ||
| Refrigerant Volume | See Step 1 under ON-VEHICLE INSPECTION | |
| Engine Coolant Volume | Check Engine Coolant Level | |
| Drive Belt | DRIVE BELT | |
| Refrigerant Pressure | See Step 2 under ON-VEHICLE INSPECTION | |
| Condenser Fan | CONDENSER FAN | |
| Ambient Temp. Sensor | AMBIENT TEMPERATURE SENSOR | |
| Evaporator Temp. Sensor | EVAPORATOR TEMPERATURE SENSOR | |
| Solar Sensor | SOLAR SENSOR | |
| Air Mix Servomotor | See Step 1 under INSPECTION. | |
| Compressor | COMPRESSOR AND MAGNETIC CLUTCH | |
| Condenser | CONDENSER | |
| Evaporator | See Step 2 under INSPECTION. | |
| Heater Radiator | See Step 3 under ON-VEHICLE INSPECTION | |
| Expansion Valve | EXPANSION VALVE | |
| A/C Control Assembly | AIR CONDITIONING CONTROL ASSEMBLY | |
| Wire Harness | Check Wiring Harness | |
| No Temperature Control | ||
| Air Mix Servomotor | See Step 1 under INSPECTION. | |
| A/C Control Assembly | AIR CONDITIONING CONTROL ASSEMBLY | |
| No Air Inlet Control | ||
| Air Inlet Servomotor | AIR INLET SERVOMOTOR | |
| A/C Control Assembly | AIR CONDITIONING CONTROL ASSEMBLY | |
| Wire Harness | Check Wiring Harness | |
| No Mode Control | ||
| Air Outlet Servomotor | AIR OUTLET SERVOMOTOR | |
| A/C Control Assembly | AIR CONDITIONING CONTROL ASSEMBLY | |
| Wire Harness | Check Wiring Harness | |
| Set Temperature Value Does Not Match Up With Operation Of Temperature Control Switch | ||
| A/C Control Assembly | AIR CONDITIONING CONTROL ASSEMBLY | |
| Brightness Does Not Change When Lighy Control Switch Is Turned | ||
| Headlight & Tail Light System | AUTOMATIC HEADLIGHTS & LIGHTING SYSTEMS | |
| A/C Control Assembly | AIR CONDITIONING CONTROL ASSEMBLY | |