Kia Optima: Self Diagnosis - Heater & A/C Control Unit(Dual). Repair procedures - Controller. Heater & A/C Control Unit(Manual) - Heating,Ventilation, Air Conditioning - Kia Optima TF 2011-2020 Service ManualKia Optima: 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. Normal or one fault code is same as a continuance operation.
B. DTC code as 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 23C(73.4F)
(2) Ambient temperature sensor: Control with the value of 20C(67F)
(3) Evaporator temperature sensor: Control with the value of -2C(28.4F)
(4) Water temperature sensor: Control with the value of 85C(185F)
(5) Temperature control actuator (Air mix potentiometer):

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

If temperature setting 25C-32C, 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.

Heater & A/C Control Unit(Dual). Repair procedures
...

Replacement
1. Disconnect the negative (-) battery terminal. 2. Using the screwdriver, remove the side cover (A). 3. Loosen the mounting screw and the ...

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