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

Kia Rio 2017-2020 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

2.

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

3.

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.

5.

Fail safe

No
Sensor
Fail condition
Fail safe function
1
In-car sensor
< 0.1V or > 4.9V
23°C (73.4°F)
2
Ambient temperature sensor
< 0.1V or > 4.9V
20°C (68°F)
3
Evaporator temperature sensor
< 0.1V or > 4.9V
 -2°C (28.4°F)
4
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

5
Mode control actuator feedback
< 0.5V or > 4.5V

Vent: Vent

Others: Defog

6
Intake actuator feedback
< 0.1V or > 4.9V

Recirculation: Recirculation

Others: Fresh

7
Foot actuator feedback
< 0.5V or > 4.5V

Vent: Open

Others: Close

8
Auto defogging sensor
(Relative humidity)
Communication fail

Relative humidity: 60%,

Surrounding temperature : 23°C (73.4°F)

9
Auto defogging sensor
(Glass temperature)
< 0.1V or > 4.9V
Glass temperature : 23°C(73.4°F)
10
Engine coolant temperature
Communication fail
85°C (185°F)
11
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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