Kia Rio: Controller / Heater & A/C Control Unit (FATC)

Kia Rio 2017-2025 YB Service Manual / Heating,Ventilation, Air Conditioning / Controller / Heater & A/C Control Unit (FATC)

Components and components location

Components

Connector Pin Function

No.	Connector A	Connector B
1	Battery	⁻
2	ISG battery (+)	⁻
3	Illumination (+)	⁻
4	Sensor (REF) (+)	Defogging actuator Feedback
5	Mode control actuator Feedback	Defogging actuator (Open)
6	Temperature control actuator Feedback	Defogging actuator (Close)
7	Intake actuator Feedback	⁻
8	Evapoerator sensor (+)	⁻
9	Ambient sensor (+)	⁻
10	Mode control actuator (VENT)	⁻
11	Mode control actuator (DEF)	Defog current
12	Temperature control actuator (COOL)	Defog temperature
13	Temperature control actuator (WARM)	Defog sck
14	Intake actuator (FRE)	Defog data
15	Intake actuator (REC)	⁻
16	HTD	Ground
17	Rear defog switch
18	⁻
19	⁻
20	Illumination (-)
21	IGN2
22	IGN1
23	Blower motor (+)
24	Photo sensor (-)
25	⁻
26	⁻
27	⁻
28	PTC relay 3
29	PTC relay 2
30	PTC on signal
31	Detent out (-)
32	⁻
33	Chassis_CAN (High)
34	Chassis_CAN (Low)
35	FET (Drain hose Feedback)
36	FET (Gate)
37	ECV (+)
38	ECV (-)
39	Sensor ground
40	Ground

Schematic diagrams

Schematic Diagrams

Repair procedures

Self Diagnosis

1.	Self-diagnosis process

How to read self-diagnostic code

During the self-diagnosis, the corresponding fault code flickers on the setup temperature display panel every 0.5 second and will show two figures.

Fault codes are displayed in numerical format.

Display	Fail description
00	Normal
11	In-car sensor open
12	In-car sensor short
13	Ambient temperature sensor open
14	Ambient temperature sensor short
17	Evaporator temperature sensor open
18	Evaporator temperature sensor short
19	Temperature door potentiometer open/short
20	Temperature door potentiometer fault
21	Mode door potentiometer open/short
22	Mode door potentiometer fault
25	Intake door potentiometer open/short
26	Intake door potentiometer fault
43	Foot door potentiometer open/short
44	Foot door potentiometer fault
45	APT (A/C Pressure Transducer) CAN signal fault
47	RPM CAN signal fault
48	Vehicle speed CAN signal fault
49	Engine coolant temperature CAN signal fault
50	Cluster ionizer fault
51	Auto defogging sensor communication and sensor input fault

Fault code display

(1)	Continuance operation: DTC code is none or one.

(2)	Continuance operation: DTC code is two or more.

(3)

STEP operation

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

B.	DTC code is two or more.

4.	If fault codes are displayed during the check, inspect malfunction causes by referring to fault codes table.

Fail safe

Sensor

Fail condition

Fail safe function

In-car sensor

< 0.1V or > 4.9V

23°C (73.4°F)

Ambient temperature sensor

< 0.1V or > 4.9V

20°C (68°F)

Evaporator temperature sensor

< 0.1V or > 4.9V

-2°C (28.4°F)

Temperature control actuator feedback

< 0.1V or > 4.9V

•	Setting temperature is 24.5°C (76.1°F) or below: Max cool

•	Setting temperature is 25.0°C (77°F) or above: Max hot

Mode control actuator feedback

< 0.5V or > 4.5V

•	Vent: Vent

•	Others: Defog

Intake actuator feedback

< 0.1V or > 4.9V

•	Recirculation: Recirculation

•	Others: Fresh

Foot actuator feedback

< 0.5V or > 4.5V

•	Vent: Open

•	Others: Close

Auto defogging sensor
(Relative humidity)

Communication fail

•	Relative humidity: 60%,

•	Surrounding temperature : 23°C (73.4°F)

Auto defogging sensor
(Glass temperature)

< 0.1V or > 4.9V

Glass temperature : 23°C(73.4°F)

Engine coolant temperature

Communication fail

85°C (185°F)

ECV feedback

No input of ECV
feedback signal

•	ECV fault signal : 1

•	PWM control output : maintain

•	Torgue : 0

Replacement

1.	Disconnect the negative (-) battery terminal.

2.	Remove the heater & A/C controller (A) after loosening the mounting unit.

3.	Disconnect the connectors (A) and the air hose (B).

4.	Installation is the reverse order of removal.

Heater & A/C Control Unit (MANUAL)

Components and components location Components Connector pin function NO. Connector A Connector B 1 Low ...

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