Hyundai Tucson: Controller / Heater & A/C Control Unit(Dual) Repair procedures

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
Display
Fail description
00
Normal
11
In-car sensor open
12
In-car sensor short
13
Ambient sensor open
14
Ambient sensor short
17
Evaporator sensor open
18
Evaporator sensor short
19
Temp door potentiometer open/short- Drive
20
Temp door potentiometer fault- Drive
21
Mode door potentiometer open/short
22
Mode door potentiometer fault
25
Intake door potentiometer open
26
Intake door potentiometer short
32
Temp door potentiometer open/short - Passenger
33
Temp door potentiometer fault - Passenger
45
APT CAN signal fault
46
-
47
RPM CAN signal fault
48
Vehicle speed CAN signal fault
49
Engine coolant temp CAN signal fault
50
Cluster ion generator fault

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.
If fault codes are displayed during the check, Inspect malfunction causes by referring to fault codes.
5.
Fail safe
(1)
In-car temperature 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)
Water temperature sensor: Control with the value of 85°C(185°F)
(5)
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.
(6)
Mode control actuator (Direction potentiometer):
Fix vent position, while selecting vent mode.
Fix defrost position, while selecting all except vent mode.
(7)
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.
Remove the under cover (A).

3.
Remove the console upper cover (B).

4.
Remove the connectors (A).

5.
Using the screwdriver, remove the center facia lower cover (A).

6.
Using the screwdriver, remove the center facia lower switch assembly (A).

7.
Disconnect the connectors and then remove the center facia lower switch assembly (A).

8.
Loosen the control panel mounting screws and then remove the control panel (A).

9.
Disconnect the connectors (A).

10.
Install in the reverse order of removal.
Heater & A/C Control Unit(Dual) Components and Components Location
Components Control Panel Connector Pin Function ConnectorPin NOFunctionConnectorPin NOFunctionConnector(A)1BatteryConnector(B)1CAN (LOW)2Tail Lamp (ILL+)2CAN (HIGH)3IG23Intake Actuator (F/B)4DR ...

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