HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS) > Diagnostic Chart for Self-Diagnosis

OPERATION

(1)

Fan speed control dial

(3)

Temperature adjustment dial

(5)

Rear window defogger switch

(2)

Air flow control dial

(4)

FRESH/RECIRC switch

(6)

A/C switch

1. A/C CONTROL MODULE SELF-DIAGNOSIS

STEPCHECKYESNO

1.SELECT SELF-DIAGNOSIS MODE IN THE CONTROL MODULE.

1) Set the air flow control dial and fan speed control dial to the AUTO position.

2) Start the engine with the A/C switch and the FRESH/RECIRC switch pressed.

Does the self-diagnosis mode operate?

2.CHECK THE LIGHTING OF THE LED.

Make sure that all switch LEDs on the control module illuminate.

Do all LEDs blink eight times?

Replace the control module.

3.CHECK SENSOR MALFUNCTION.

1) Set the air flow control dial and fan speed control dial to the AUTO position.

2) If the system has trouble for each sensor, the FRESH/RECIRC switch LED blinks or is turned off.

3) If the system has no malfunctions, the FRESH/RECIRC switch LED is illuminated.

Does the FRESH/RECIRC switch LED illuminate?

4.CONFIRM MALFUNCTIONING SENSOR.

1) Set the air flow control dial to AUTO.

2) Turn the fan speed control dial to each mode position, and check each switch LED illumination according to sensor check table.

When turning the fan speed control dial to each mode position, does the FRESH/RECIRC switch LED go off?

Repair the defective sensor.

5.CHECK AIR MIX DOOR AND MODE DOOR POSITION SIGNALS.

1) Set the air flow control dial to FACE.

2) Turn the fan speed control dial to AUTO.

3) If there is a system malfunction in the air mix door signal or the mode door position signal, the FRESH/RECIRC switch LED goes off or blinks.

4) If the system has no malfunctions, the FRESH/RECIRC switch LED is illuminated.

Does the FRESH/RECIRC switch LED illuminate?

6.CHECK AIR MIX DOOR POSITION DRIVE SIGNALS.

1) Set the air flow control dial to FACE.

2) Place the fan speed control dial in each position and then check each LED illumination conditions.

Do the LEDs illuminate in accordance with operation signal table?

Check the air mix door actuator circuit.

7.CHECK MODE DOOR POSITION DRIVE SIGNAL.

1) Press the A/C switch.

2) Place the fan speed control dial in each position and then check each LED illumination conditions.

Do the LEDs illuminate in accordance with operation signal table?

Check the mode door actuator circuit.

8.CHECK OPERATION OF EACH ACTUATOR, BLOWER FAN AND COMPRESSOR CLUTCH.

1) Set the air flow control dial to B/L.

2) Turn the fan speed control dial from AUTO to 7th, and select operating modes.

3) Check the operation of each mode according to operating mode table.

• FRESH/RECIRC door

• Air flow control door

• Air mix door

• Blower fan

• A/C compressor

• PTC heater

Does the operation of each mode match to operating mode table?

Turn the fan speed control dial to OFF or the ignition switch to OFF in order to complete self-diagnosis.

Repair the malfunctioning part in accordance with each diagnostic chart.

2. SENSOR CHECK TABLE

NOTE:

When the sunload sensor check is performed indoors or in the shade, it could be diagnosed as having an open circuit. Always check the sunload sensor at a location exposed to direct sunlight.

Air flow control dial position

Fan speed control dial position

Sensor

No trouble

Short circuit

Open circuit

When currently malfunctioning

When having malfunctioned in the past

AUTO

AUTO

In-vehicle sensor

FRESH/RECIRC switch LED is turned off

FRESH/RECIRC switch LED blinks (Illuminates for 0.2 sec. ⇔ turns off for 0.2 sec.)

FRESH/RECIRC switch LED blinks (Illuminates for 1 sec. ⇔ turns off for 1 sec.)

Rear window defogger switch LED is turned off

Rear window defogger switch LED illuminates

1st

Ambient sensor

FRESH/RECIRC switch LED blinks (Illuminates for 0.2 sec. ⇔ turns off for 0.2 sec.)

2nd

Evaporator sensor

FRESH/RECIRC switch LED blinks (Illuminates for 0.2 sec. ⇔ turns off for 0.2 sec.)

3rd

Engine coolant temperature sensor

—

4th

Sunload sensor

FRESH/RECIRC switch LED blinks (Illuminates for 0.2 sec. ⇔ turns off for 0.2 sec.)

5th — 7th

CAN communication

—

3. OPERATING MODE TABLE

Operation

Fan speed control dial position

AUTO

1st

2nd

3rd

4th

5th

6th

7th

Blower fan

4 V

4 V

4.9 V

5.9 V

7.0 V

8.3 V

9.8 V

14 V

FRESH/RECIRC door

RECIRC

RECIRC

MIX

FRESH

FRESH

FRESH

FRESH

FRESH

Air flow control door

FACE

FACE

FACE

B/L

HEAT

HEAT

D/H

DEF

Air mix door

0%

0%

0%

50%

50%

100%

100%

100%

A/C compressor

OFF

ON

ON

ON

ON

ON

ON

ON

PTC heater

(Diesel engine model only)

OFF

OFF

OFF

ON (Mini PTC heater)

ON (Mini PTC heater)

ON (PTC heater 1)

ON (PTC heater 2)

ON (PTC heater 2)

4. DRIVE SIGNAL CHECK TABLE

Air flow control dial position

Fan speed control dial position

Drive signal to check

A/C switch LED

No trouble

Short circuit

Open circuit

When currently malfunctioning

When having malfunctioned in the past

FACE

AUTO

MIX

#1

Blinking (Illuminates for 0.2 sec. ⇔ turns off for 0.2 sec.)

FRESH/RECIRC switch LED is turned off

FRESH/RECIRC switch LED blinks (Illuminates for 0.2 sec. ⇔ turns off for 0.2 sec.)

FRESH/RECIRC switch LED blinks (Illuminates for 1 sec. ⇔ turns off for 1 sec.)

Rear window defogger switch LED is turned off

Rear window defogger switch LED illuminates

1st

MIX

#2

2nd

MIX

#3

3rd — 7th

MIX

#4

AUTO

MODE

#1

Blinking (Illuminates for 1 sec. ⇔ turns off for 1 sec.)

1st

MODE

#2

2nd

MODE

#3

3rd — 7th

MODE

#4