Hyundai Ioniq: Controller. Heater & A/C Control Unit (DATC) / Repair procedures

Hyundai Ioniq (AE) 2017-2024 Service Manual / Heating, Ventilation and Air Conditioning / Controller. Heater & A/C Control Unit (DATC) / Repair procedures

Self Diagnosis

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 .

Fault code display

(1)	Continuance operation : DTC code.

(2)	Continuance operation : DTC code.

(3)	STEP operation. A. Nomal or one fault code is same as a continuance operation. B. DTC code.

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	Mood door potentiometer open/short- Passenger
56	Mood door potentiometer fault- Passenger
60	COMP CAN signal fault
61	COMP operation state ERROR receive
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	Air-Bag Deployment (Ordering E-COMP operation to stop)
78	E-COMP Interlock Circuit OPEN
85	Blower Motor fault
86	Blower Motor Signal ERROR

Fail safe

NO	Item	Fault	Fail Safe
1	Incar sensor	Open or Short	Control with the value of 25°C(77.0°F)
2	Amblent 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 recirculation position, while selecting recirculation 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 - 2 °C(28.4°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 potention meter	Open or Short	In the VENT, Bi-Level mode, DEF Door Potention Meter is fixed in CLOSE position. In the mode other VENT, Bi-Level mode, DEF Door Potention Meter is fixed in OPEN position.
15	Passenger mode doorpotention meter	Open or Short	In the VENT mode, PS Mode Door Potention Meter is fixed in VENT position. In the mode other than VENT, PS Mode Door Potention Meter 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.	Remove the crash pad center garnish. (Refer to Body - "Crash Pad Garnish")

3.	Loosen the mounting screws and remove the A/C & heater controller unit (A).

4.	Press the lock pin and separate the A/C & heater controller unit connectors (A).

To install, reverse the removal procedure.

•	Make sure the connector are connected in properly.

•	Replace any damaged clips. 7

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