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

OPERATION

(1)

Defroster switch

(4)

A/C switch

(7)

OFF switch

(2)

Rear window defogger switch

(5)

Fan dial

(8)

Temperature adjustment dial

(3)

Air flow control dial

(6)

FRESH/RECIRC switch

(9)

AUTO switch

1. A/C CONTROL PANEL SELF-DIAGNOSIS

STEPCHECKYESNO

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

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

2) Start the engine while pressing the A/C switch and the FRESH/RECIRC switch.

Does the self-diagnosis mode operate?

2.CHECK THE LIGHTING OF THE LED.

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

Do all LEDs blink eight times?

Replace the control panel.

3.CHECK SENSOR MALFUNCTION.

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

2) If any sensor in the system has a malfunction, the FRESH/RECIRC switch LED blinks or turns 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 dial to each mode position, and check each switch LED illumination according to sensor check table.

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

Repair defective sensors.

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

1) Set the air flow control dial to FACE.

2) Turn the fan 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 turns off.

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 OPERATION SIGNALS.

1) Set the air flow control dial to FACE.

2) Turn the fan dial and check the LED illumination status at each position.

Do the LEDs illuminate in accordance withe operation signal table?

Check the air mix door actuator circuit.

7.CHECK MODE DOOR POSITION OPERATION SIGNALS.

1) Press the A/C switch.

2) Turn the fan dial and check the LED illumination status at each position.

Do the LEDs illuminate in accordance withe 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 dial from AUTO to 7th, and select operating modes.

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

• Intake door

• Air flow control door

• Air mix door

• Blower fan

• A/C compressor

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

Turn the fan 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.

• LED illuminates to warn the past malfunction if it was detected four times or more in the past.

• To clear the past malfunction, disconnect the ground cable from the battery, or press and hold the FRESH/RECIRC switch for five seconds or more when performing the self-diagnosis Step 3 to Step 7.

Air flow control dial position

Fan dial position

Sensor

No trouble

Short circuit

Open circuit

If there is a current malfunction

If there was a past malfunction

AUTO

AUTO

In-vehicle sensor

FRESH/RECIRC switch LED is off

FRESH/RECIRC switch LED is flashing (illuminated for 0.2 seconds ⇔ off for 0.2 seconds)

FRESH/RECIRC switch LED is flashing (illuminated for 1 second ⇔ off for 1 second)

Rear window defogger switch LED is off

Rear window defogger switch LED is illuminated

1st

Ambient sensor

FRESH/RECIRC switch LED is flashing (illuminated for 0.2 seconds ⇔ off for 0.2 seconds)

2nd

Evaporator sensor

FRESH/RECIRC switch LED is flashing (illuminated for 0.2 seconds ⇔ off for 0.2 seconds)

3rd

Engine coolant temperature sensor

—

4th

Sunload sensor

FRESH/RECIRC switch LED is flashing (illuminated for 0.2 seconds ⇔ off for 0.2 seconds)

5th — 7th

CAN communication

—

3. OPERATING MODE TABLE

Operation

Fan 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

Intake 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

4. OPERATION PROGRESS CHECK TABLE

NOTE:

• LED illuminates to warn the past malfunction if it was detected four times or more in the past.

• To clear the past malfunction, disconnect the ground cable from the battery, or press and hold the FRESH/RECIRC switch for five seconds or more when performing the self-diagnosis Step 3 to Step 7.

Air flow control dial position

Fan dial position

Operation signal being checked

A/C switch LED

No trouble

Short circuit

Open circuit

If there is a current malfunction

If there was a past malfunction

FACE

AUTO

MIX

#1

Flashing (illuminated for 0.2 seconds ⇔ off for 0.2 seconds)

FRESH/RECIRC switch LED is off

FRESH/RECIRC switch LED is flashing (illuminated for 0.2 seconds ⇔ off for 0.2 seconds)

FRESH/RECIRC switch LED is flashing (illuminated for 1 second ⇔ off for 1 second)

Rear window defogger switch LED is off

Rear window defogger switch LED is illuminated

1st

MIX

#2

2nd

MIX

#3

3rd — 7th

MIX

#4

AUTO

MODE

#1

Flashing (illuminated for 1 seconds ⇔ off for 1 seconds)

1st

MODE

#2

2nd

MODE

#3

3rd — 7th

MODE

#4