Air Conditioning System

Symptom

Suspected area

See page

Whole functions of the A/C system does not operate

1. IG power source circuit

AC-127

2. Heater control panel power source circuit

AC-103

3. Heater control switch circuit

AC-105

4. LIN communication circuit

AC-132

5. Heater control panel LH

AC-182

6. A/C amplifier

-

Air Flow Control : No blower operation

1. IG power source circuit

AC-127

2. Blower motor circuit

AC-94

3. Heater control panel power source circuit

AC-103

4. Heater control switch circuit

AC-105

5. LIN communication circuit

AC-132

6. Heater control panel LH

AC-182

7. A/C amplifier

-

Air Flow Control : No blower control

1. Blower motor circuit

AC-94

2. Room temperature sensor circuit

AC-46

3. Ambient temperature sensor circuit

AC-50

4. Solar sensor circuit (Driver side)

AC-70

5. Solar sensor circuit (Passenger side)

AC-58

6. A/C amplifier

-

Air Flow Control : Insufficient air flow

Blower motor circuit

AC-94

Temperature Control : No cool air comes out

1. Blower motor circuit

AC-94

2. Air mix control servo motor circuit (Driver side)

AC-80

3. Air mix control servo motor circuit (Passenger side)

AC-74

4. Room temperature sensor circuit

AC-46

5. Ambient temperature sensor circuit

AC-50

6. Evaporator temperature sensor circuit

AC-55

7. Pressure switch circuit

AC-66

8. Compressor circuit

AC-100

9. Compressor lock sensor circuit

AC-62

10. Compressor solenoid circuit

AC-82

11. A/C amplifier

-

Symptom

Suspected area

See page

Temperature Control : No Warm air comes out

1. Steering pad switch circuit

AC-123

2. Air mix control servo motor circuit (Driver side)

AC-80

3. Air mix control servo motor circuit (Passenger side)

AC-74

4. Room temperature sensor circuit

AC-46

5. Ambient temperature sensor circuit

AC-50

6. Evaporator temperature sensor circuit

AC-55

7. Solar sensor circuit (Driver side)

AC-70

8. Solar sensor circuit (Passenger side)

AC-58

9. A/C amplifier

-

Temperature Control : Output is warmer or cooler than the set temperature or response is slow

1. Steering pad switch circuit

AC-123

2. Air mix control servo motor circuit (Driver side)

AC-80

3. Air mix control servo motor circuit (Passenger side)

AC-74

4. Room temperature sensor circuit

AC-46

5. Ambient temperature sensor circuit

AC-50

6. Evaporator temperature sensor circuit

AC-55

7. Solar sensor circuit (Driver side)

AC-70

8. Solar sensor circuit (Passenger side)

AC-58

9. A/C amplifier

-

Temperature Control : No temperature control (only Max. cool or Max. warm)

1. Steering pad switch circuit

AC-123

2. Air mix control servo motor circuit (Driver side)

AC-80

3. Air mix control servo motor circuit (Passenger side)

AC-74

4. Room temperature sensor circuit

AC-46

5. Ambient temperature sensor circuit

AC-50

6. Evaporator temperature sensor circuit

AC-55

7. Solar sensor circuit (Driver side)

AC-70

8. Solar sensor circuit (Passenger side)

AC-58

9. A/C amplifier

-

No air inlet control

1. Air inlet control servo motor circuit

AC-76

2. A/C amplifier

-

No air flow mode control

1. Air outlet control servo motor circuit

AC-78

2. A/C amplifier

-

Blinking of A/C indicator

Compressor solenoid circuit

AC-82

Diagnostic trouble code are not recorded. Set mode is cleared when ignition switch is turned OFF.

Back up power source circuit

AC-130

Engine idle up dose not occur, or is continuous

1. Compressor circuit

AC-100

2. Compressor lock sensor circuit

AC-62

3. Compressor solenoid circuit

AC-82

4. A/C amplifier

-

Set temperature value displayed does not much up with operation of temperature control switch.

1. Heater control panel power source circuit

AC-103

2. Heater control switch circuit

AC-105

3. LIN communication circuit

AC-132

4. Heater control panel LH

AC-182

5. A/C amplifier

-

The seat heater switch indicator does not come on.

1. Seat heater control power source circuit

AC-114

2. Seat heater indicator circuit

AC-120

3. Seat heater control sub-assembly

SE-59

4. A/C amplifier

-

Unable to access the diagnosis mode.

A/C amplifier

-

Symptom

Suspected area

See page

Unable to control A/C with the steering pad switch

1. Steering pad switch circuit

AC-123

2. Heater control panel power source circuit

AC-103

3. LIN communication circuit

AC-132

4. Heater control panel LH

AC-182

5. A/C amplifier

-

DTC not recorded. Set mode is cleared when IG switch is turned off.

I.Back up power source circuit

AC-130

2. A/C amplifier

-

Seat heater does not operate.

1. Seat heater switch circuit

AC-116

2. Seat heater control power source circuit

AC-114

3. Seat heater temperature sensor circuit (Driver side)

AC-85

4. Seat heater temperature sensor circuit (Passenger side)

AC-88

5. Seat heater control sub-assembly

SE-59

6. A/C amplifier

-

Seat ventilators do not operate.

1. Seat heater switch circuit

AC-116

2. Seat heater control power source circuit

AC-114

3. Seat blower control circuit

AC-108

4. Seat heater control sub-assembly

SE-59

5. Seat climate control blower

SE-51

6. REMOVE AIR INLET SERVO MOTOR

(a) Remove the 3 screws and air inlet servo motor.

7. REMOVE AIR DUCT SUB-ASSEMBLY NO.3

(a) Disengage the 4 claws and then remove the air duct sub-assembly No.3.

8. REMOVE COOLING UNIT MOTOR SUB-ASSEMBLY

(a) Remove the 3 screws and cooling unit motor sub-assembly w/ fan.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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