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Hyundai Azera: Heater & A/C Control Unit(Full Automatic) Repair procedures - Controller - Heating,Ventilation, Air Conditioning - Hyundai Azera 2011-2026 Service ManualHyundai Azera: Heater & A/C Control Unit(Full Automatic) Repair procedures

Fifth generation HG (2011–2026) / Hyundai Azera 2011-2026 Service Manual / Heating,Ventilation, Air Conditioning / Controller / Heater & A/C Control Unit(Full Automatic) Repair procedures

Inspection
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/short
26
Intake door potentiometer fault
32
Temp door potentiometer open/short - Passenger
33
Temp door potentiometer fault - Passenger
43
Auto defog potentiometer open/short
44
Auto defog potentiometer fault
45
APT CAN signal fault
47
RPM CAN signal fault
48
Vehicle speed CAN signal fault
49
Engine coolant temp CAN signal fault
50
Cluster ionizer 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.
NO.
Item
Fault
Fail Safe
1
In-car Sensor
Open or Short
Control with the value of 25°C(77.0°F)
2
Ambient temperature sensor
Open or Short
Control with the value of 20°C(67°F)
3
Evaporator temperature 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-24.5°C, fix at maximum cooling position.
If temperature setting 25°C-32°C, 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
R_NEngldlTgC
FFH or non reception

8
N
non reception
Control with the value of 650 RPM
9
F_N_ENG TCU)
1H or non reception
Control with the value of 650 RPM
10
VS
FFh or non reception
VS_TCU(TCU2),
(VS,VS_TCUall FFH or non reception : A/C OFF)
11
Temp _ ENG
FFh or NO reception
Control with the value of - 2 °C(28.4°F)
12
TPS (Throttle Position Signal)
FFh or NO reception
5%
13
R_TqAcnApvC
FFh or NO reception
A/C OFF (0Nm)
14
R_PAcnC
FFh or NO reception
A/C OFF (0hpa)
15
RLY_AC
non reception
A/C OFF
16
Auto Defog Sensor
Open or Short
Control with the Humidity of 0%
17
Defog Door Potention Meter
Open or Short
VENT Bi- Level MODE  : Fix CLOSE positionwhile selecting all except
VENT Bi- Level mode. : Fix OPEN position.
18
ECV
Open
CF_Fatc_EcvFlt = 01H(fault)
ECV  OFF,
A/C Output Off. 

Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Remove the gear boots and gear knob (A).

3.
Remove the console upper cover (A) and then disconnect the connector (B).

4.
Remove the center fascia side garnish (A).

5.
Remove the center fascia tray (A) and then disconnect the connector (B).

6.
Using the screwdriver, remove the center fascia panel (A).

7.
Disconnect the connectors (A) and then remove the center fascia panel (B) from the crash pad.

8.
Loosen the mounting screws and then remove the heater and A/C controller (A).

9.
Installation is the reverse order of removal.
Heater & A/C Control Unit(Full Automatic) Components and Components Location
Components Connector pin function ConnectorPIN NoFunctionConnectorPIN NoFunctionConnector (A)1Tail (+)Connector (A)27Evaporator Sensor (+)2Sensor REF (+5V)28-3CAN HIGH29Incar Sensor (+)4CAN LOW30D ...

See also:

In-car sensor Description and Operation
Description 1. In-car air temperature sensor is located at the lower crash pad. 2. The sensor contains a thermistor which measures the temperature of the cabin. The signal, determined by the ...

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