START INSPECTIONS
Perform the pre-inspection.
Perform the self-diagnosis.
Does the self-diagnosis operate?
YES. Go to CONFIRM MALFUNCTION PART .
NO. Go to A/C OR SELF-DIAGNOSIS SYSTEMS DO NOT OPERATE .
INSPECTION
Before performing diagnosis, check the following items which might affect A/C system problems.
SELECT CONTROL PANEL TO SELF-DIAGNOSIS MODE
Turn the fan speed control dial to OFF position.
Start the engine and press the A/C switch for at least 5 seconds. The A/C switch must be pressed within 10 seconds after starting engine.
Does the self-diagnosis mode operate?
YES. Go to SENSOR CHECK TABLE .
NO. Go to A/C OR SELF-DIAGNOSIS SYSTEMS DO NOT OPERATE .
Make sure that all switch LED blink on control panel.
Do all LED illuminate or blink?
YES. Go to CHECK SENSORS MALFUNCTION .
NO
Check the switch LED.
TROUBLE SYMPTOM
- Switch LEDs are faulty and switches do not operate.
- Self-diagnosis system does not operate.
Scheme 82
- Blower motor is not rotated.
- Blower motor speed does not change.
Scheme 83
- Compartment temperature is not changed. (No cool air is discharged.)
- A/C system does not respond quickly.
Scheme 84
FRESH/RECIRC mode is not changed.
Scheme 85
Air flow outlet is not changed.
Scheme 86
Outlet air temperature is not changed.
Scheme 87
Fan speed is not switched when the fan speed control dial is in AUTO position.
Scheme 88
- When turning the AUTO switch to ON, blower fan speed, outlet port and inlet port is not changed.
- If the switch LED indicates that the sensor is malfunctioning, replace the auto A/C control module. The in-vehicle sensor is built into the auto A/C control module and cannot be replaced as a single unit.
Scheme 89
- Sensor identified that sunlight is at maximum. Then, A/C system is controlled to COOL side.
- Sensor identified that sunlight is at minimum. Then, A/C system is controlled to HOT side.
Note. When the sunload sensor is checked indoors or in the shade, it may be diagnosed as open circuit. Always check the sunload sensor at a place where sun shines directly on it.
Scheme 90
| Symptom | Problem parts |
|---|---|
| A/C system fails to operate. | Fuse (M/B No. 5, F/B No. 17) Connector (Poor contact) Ground Auto A/C control module Blower fan motor Blower fan relay A/C Relay Compressor (Magnet clutch) Evaporator sensor |
| Fuse is blown out. | Fuse (M/B No. 5, F/B No. 17) Connector (Poor contact) |
| Illumination cannot dim. | Fuse (M/B No. 5, F/B No. 17) Connector (Poor contact) Auto A/C control module |
| Blower fan does not rotate or fan speed cannot be controlled. | Fuse (M/B No. 5, F/B No. 17) Connector (Poor contact) Ground Auto A/C control module Blower fan motor Blower fan relay |
| Unable to switch suction vents. | Connector (Poor contact) Auto A/C control module Intake door actuator |
| Unable to switch blow vents. | Connector (Poor contact) Auto A/C control module Mode door actuator |
| Compartment temperature does not increase. (No hot air is discharged.) | Connector (Poor contact) Auto A/C control module Air mix door actuator In-vehicle sensor, ambient sensor, evaporator sensor and sunload sensor In-vehicle sensor aspirator hose |
| Compartment temperature does not decrease. (No cool air is discharged.) | Connector (Poor contact) Auto A/C control module Air mix door actuator A/C Relay Compressor (Magnet clutch) Radiator fan motor Radiator fan relay In-vehicle sensor, ambient sensor, evaporator sensor and sunload sensor In-vehicle sensor aspirator hose |
| Compartment temperature is higher or lower than setting temperature. | Auto A/C control module Air mix door actuator In-vehicle sensor, ambient sensor, evaporator sensor and sunload sensor In-vehicle sensor aspirator hose |
| Compartment temperature does not quickly respond to setting temperature. | Air mix door actuator In-vehicle sensor, ambient sensor, evaporator sensor and sunload sensor In-vehicle sensor aspirator hose |
| Radiator fan does not rotate during A/C operation. | Radiator fan motor Radiator fan relay |
SYMPTOM AND PROBLEM PARTS REFERENCE