Self-diagnosis
1.

Self-diagnosis process

2.

How to read self-diagnostic code

After the display panel flickers three times every 0.5 second, the corresponding fault code flickers on the setup temperature display panel every 0.5 second and will show two figures. Codes are displayed in numerical format.

Fault code

Fault code

Fail description

Control unit

DTC

00

-

Normal

11

B1234

In-car temperature sensor open

12

B1233

In-car temperature sensor short

13

B1238

Ambient temperature sensor open

14

B1237

Ambient temperature sensor short

17

B1242

Evaporator temperature sensor open

18

B1241

Evaporator temperature sensor short

19

B1245

Temperature control actuator feed back open

19

B1246

Temperature control actuator feed back short

20

B2406

Temperature control actuator failure

21

B1249

Mode control actuator open

21

B1250

Mode control actuator short

22

B2409

Mode control actuator failure

25

B1208

Intake potentiometer open

25

B1209

Intake potentiometer short

26

B2408

Intake potentiometer failure

3.

Fault code display

(1)

Continuance operation

(2)

Continuance operation : DTC code is more two

(3)

Step operation

A.

Nomal or one fault code is same a continuance operation.

B.

DTC code is more two.

4.

If fault codes are displayed during the check, Inspect malfunction causes by referring to fault codes.

5.

Fail safe

(1)

Incar sensor : Control with the value of 23°C(73.4°F)

(2)

Ambient temperature sensor: Control with the value of 20°C(67°F)

(3)

Evaporator temperature sensor: Control with the value of -2°C(28.4°F)

(4)

Temperature control actuator (Air mix potentiometer):

If temperature setting LO-24.5°C, fix at maximum cooling position.

If temperature setting 25°C-HI, fix at maximum heating position

(5)

Mode control actuator (Direction potentiometer):

Fix vent position, while selecting vent mode.

Fix defrost position, while selecting all except vent mode.

(6)

Intake control actuator :

Fix fresh position, while selecting fresh mode.

Fix recirculation position, while selecting recirculation mode.

Replacement
1.

Disconnect the negative (-) battery terminal.

2.

Put the SST (A) into the space betwen the center facia (B).

3.

Disconnect the connectors (A) from the center facia.

4.

Remove the Heater ＆ A/C controller (A) after loosening 4 screws.

5.

Installation is the reverse order of removal.

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