Kia Niro: Heater & A/C Control Unit / Repair procedures

Self Diagnosis
1.

Self-diagnosis process.

  

When operating the self-diagnostics, the below fault (self-diagnostics code) will blink at 0.5 seconds interval on the temperature display settings (driver's side only) and the remaining symbols are OFF .

2.

Fault code display

(1)

Continuance operation : DTC code.

(2)

Continuance operation : DTC code.

(3)

STEP operation.

A. Same with continuance operation for normal or one fault code

B. DTC code.

3.

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

Display
Fail description
0
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 - Driver
22
Mode door potentiometer fault - Driver
23
Auto Defog Sensor Open
24
Auto Defog Sensor Short
25
Intake door potentiometer open
26
Intake door potentiometer short
32
Temp door potentiometer open/short - Passenger
33
Temp door potentiometer fault - Passenger
43
Defog door potentiometer open/short
44
Defog door potentiometer fault
45
APT CAN signal fault
48
Vehicle speed CAN signal fault
49
Engine coolant temp CAN signal fault
50
Cluster Ionizer Fault
51
Duct sensor vent open - Drive
52
Duct sensor vent shot - Drive
53
Duct sensor floor open - Drive
54
Duct sensor floor shot - Drive
55
Mode door potentiometer open/short- Passenger
56
Mode door potentiometer fault- Passenger
60
COMP CAN signal fault
61
COMP operation state ERROR received
62
Low_Voltage
63
High_Voltage
64
Cold protection
65
Overheat protection
67
Overcurrent protection
68
Abnormal current sensor
69
Restart failure
70
Overload
71
A/C operating permission is not received
72
A/C allowable power is not received
73
A/C allowable power is the inoperative range of E-COMP
74
APT high pressure
75
APT low pressure
76
Ordering A/C operation to stop (from EMS)
77
Airbag Deployment (Ordering E-COMP operation to stop)
78
Compressor Interlock Circuit OPEN
85
Blower Motor fault

4.

Fail safe

NO
Item
Fault
Fail Safe
1
In-car sensor
Open or Short
Control with the value of 25°C (77.0°F)
2
Ambient sensor
Open or Short
Control with the value of 20°C (67°F)
3
Evaporator sensor
Open or Short
Control with the value of -2°C (28.4°F)
4
Temperature control actuator
Open or Short
If temperature setting 17°C (62.6°F) - 24.5°C (76.1°F), fix at maximum cooling position.
If temperature setting 25°C (77°F) - 32°C (89.6°F), fix at maximum heating position.
5
Mode control actuator
Open or Short
Fix vent position, while selecting vent mode.
Fix defrost position, while selecting all except vent mode.
6
Intake control actuator
Open or Short
Fix fresh position, while selecting fresh mode.
Fix recirculation position, while selecting recirculation mode.
7
Vehicle speed
NO reception
A/C OFF (Control with the value of 0 km/h)
8
Engine coolant temperature
NO reception
Control with the value of 90°C (194°F)
9
APT
NO reception
COMP operation stop (RPM=0)
10
COMP Inverter
Inverter WAIT/SLEEP Mode entry
COMP operation stop (RPM=0)
11
A/Con operating permission
FFh or NO reception
COMP operation stop (RPM=0)
12
A/C Compressor permission power
FFh or NO reception
COMP operation stop (RPM=0)
13
CF_Hcu_PTOperMod
FFh or NO reception
EV Mode substitute control
14
Defogging door potentiometer
Open or Short
In the VENT, Bi-Level mode, DEF Door Potentiometer is fixed in CLOSE position.
In the mode other VENT, Bi-Level mode, DEF Door Potentiometer is fixed in OPEN position.
15
Passenger mode door potentiometer
Open or Short
In the VENT mode, PS Mode Door Potentiometer is fixed in VENT position.
In the mode other than VENT, PS Mode Door Potentiometer is fixed in DEF position.
16
Duct sensor_Vent [LH]
Open or Short
In case of the Duct sensor failure, replace the Duct sensor with Temp Door mapping.
17
Duct sensor_Floor [LH]
Open or Short
In case of the Duct sensor failure, replace the Duct sensor with Temp Door mapping.

Replacement
1.

Disconnect the negative (-) battery terminal.

2.

Using a screwdriver or remover, remove the front console garnish (A).

3.

Using a remover, remove the crash pad side cover [RH] (A).

4.

Loosen the screw and remove the crash pad plate [RH] (A).

5.

Remove the engine start button connector (A).

6.

Remove the center fascia panel (A).

7.

Loosen the screw and remove the heater and air conditioner control unit (A).

8.

Remove the heater and the air conditioning control unit connector (A).

9.

Install in the reverse order of removal.

Components and components location
Components [AUDIO Type] Connector Pin Function No. Connector A Connector B 1 Battery ...

Heater
...

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