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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	Fail description
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
15	B1202	Water temperature sensor open
16	B1203	Water temperature sensor short
17	B1242	Evaporator temperature sensor open
18	B1241	Evaporator temperature sensor short
19	B1245	Temperature control actuator feed back open (Drive's)
19	B1246	Temperature control actuator feed back short (Drive's)
20	B2406	Temperature control actuator failure
21	B1249	Mode control actuator open
21	B1250	Mode control actuator short
22	B2409	Mode control actuator failure
23	B1200	Humidity sensor open
24	B1201	Humidity sensor short
25	B1208	Intake potentiometer open
25	B1209	Intake potentiometer short
26	B2408	Intake potentiometer failure
27	B1257	AQS sensor open
28	B1258	AQS sensor short
31	B1259	AQS sensor failure
32	B1204	Temperature control actuator open (Passenger's)
32	B1205	Temperature control actuator short (Passenger's)
33	B2415	Temperature control actuator failure

3.

Fault code display

(1)

Continuance operation : DTC code is one.

(2)

Continuance operation : DTC code is more two.

(3)

STEP operation

A. Nomal or one fault code is same as a continuance operation.

B. DTC code os more two.

4.

Diagnostic procedure refer to DTC code.

5.

Fail safe

(1)

In-car temperature sensor: Control with the value of 25°C(77°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)

Humidity sensor: Control with the value of 10%

(5)

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

(6)

Temperature control actuator (Air mix potentiometer):

If temperature setting 17°C-24.5°C, fix at maximum cooling position.

If temperature setting 25°C-32°C, fix at maximum heating position.

(7)

Mode control actuator (Direction potentiometer):

Fix vent position, while selecting vent mode.

Fix defrost position, while selecting all except vent mode.

(8)

Intake control actuator :

Fix fresh position, while selecting fresh mode.

Fix recirculation position, while selecting recirculation mode.

(9)

AQS sensor : AQS operation OFF.

Intake position : The position before selecting AQS switch.