Hyundai Tucson (NX4) 2022-2025 Service Manual / Heating, Ventilation and Air Conditioning / Controller / Heater & A/C Control Unit (DATC)

Hyundai Tucson: Controller / Heater & A/C Control Unit (DATC)

- Components

Connector Pin Function

Pin No	Connector A
1	Battery (+)
2	IGN2
3	IGN1
4	Local CAN (High)
5	Local CAN (Low)
6	In-car sensor (+)
7	-
8	Sensor ground
9	ISG B+
10	ILL+ (TAIL)
11	-
12	-
13	-
14	-
15	ILL- (RHEO)
16	Ground

- 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. Nomal or one fault code is same as a continuance operation. B. DTC code.

3.Self diagnostic code

Display	Fail description	Remarks
0	Normal
11	Interior Temperature Sensor Disconnection (OPEN)
12	Interior Temperature Sensor Short Circuit (SHORT)
13	Ambient Temperature Sensor Disconnection (OPEN)
14	Ambient Temperature Sensor Disconnection (SHORT)
17	Evaporator Temperature Sensor Disconnection (OPEN)
18	Evaporator Temperature Sensor Disconnection (SHORT)
19	Driver Seat Temperature Control Actuator Feedback Disconnection/Short Circuit (OPEN/SHORT)
19	SHORT Range [TEMP F/B Voltage ≤ 0.1V], OPEN Range [TEMP F/B Voltage ≥ 4.9V]
20	Dr TEMP DOOR POTENTIOMETER LOCKED	If the actuator cannot reach the desired control position in 10 seconds, then it is deemed to be locked.
21	MODE DOOR POTENTIOMETER Disconnection/Short Circuit (OPEN/SHORT)
	SHORT Range [DR MODE F/B Voltage ≤ 0.1V]
	OPEN Range [DR MODE F/B Voltage ≥ 4.9V]
22	MODE DOOR POTENTIOMETER LOCKED	If the actuator cannot reach the desired control position in 10 seconds, then it is deemed to be locked.
24	AUTO DEFOG SENSOR (SHORT)	ADS specification ONLY
25	INTAKE DOOR POTENTIOMETER Disconnection/Short Circuit (OPEN/SHORT)
	SHORT Range [INTAKE F/B Voltage ≤ 0.1V]
	OPEN Range [INTAKE F/B Voltage ≥ 4.9V]
26	INTAKE DOOR POTENTIOMETER LOCKED	If the actuator cannot reach the desired control position in 10 seconds, then it is deemed to be locked.
32	PASSENGER TEMP DOOR POTENTIOMETER Disconnection/Short Circuit (OPEN/SHORT)
	SHORT Range [TEMP F/B Voltage ≤ 0.1V]
	OPEN Range [TEMP F/B Voltage ≥ 4.9V]
33	PASSENGER TEMP DOOR POTENTIOMETER LOCKED
43	DEFOG DOOR POTENTIOMETER Disconnection/Short Circuit (OPEN/SHORT)	ADS specification ONLY
	SHORT Range [DEFOG F/B Voltage ≤ 0.1V]
	OPEN Range [DEFOG F/B Voltage ≥ 4.9V]
44	DEF DOOR POTENTIOMETER LOCKED	If the actuator cannot reach the desired control position in 10 seconds, then it is deemed to be locked.
44	DEF DOOR POTENTIOMETER LOCKED	ADS specification ONLY
45	APT CAN Signal Error
47	RPM CAN SIGNAL Error
48	Vehicle Speed CAN Signal Error
49	Engine coolant temperature CAN Signal Error
71	ECV Fault (OPEN)
72	Communication error between the front and rear seats.

4.FAIL SAFE

NO	SIGNAL / ITEM	Failure Criteria	Alternative Value in Case of Failure
1	INCAR SENSOR	Voltage ≤ 0.1V or Voltage ≥ 4.9V	Fixed at 22°C
2	AMB SENSOR	Voltage ≤ 0.1V or Voltage ≥ 4.9V	Fixed at 20°C
3	EVA SENSOR	Voltage ≤ 0.1V or Voltage ≥ 4.9V	Fixed at -2°C
4	TEMPERATURE CONTROL ACTUATOR	Voltage ≤ 0.1V or Voltage ≥ 4.9V	When the set temperature is 16.5°C → 22°C : Fixed to the maximum cooling.
4	TEMPERATURE CONTROL ACTUATOR	Voltage ≤ 0.1V or Voltage ≥ 4.9V	When the set temperature is 22.5°C → 27.5°C : Fixed to the maximum heating.
5	MODE CONTROL ACTUATOR	Voltage ≤ 0.1V or Voltage ≥ 4.9V	In case of vent mode : Vent position is fixed.
5	MODE CONTROL ACTUATOR	Voltage ≤ 0.1V or Voltage ≥ 4.9V	Other modes other than the vent : Defrost position is fixed.
6	INTAKE ACTUACOR	Voltage ≤ 0.1V or Voltage ≥ 4.9V	In case of outdoor ventilation mode : Outdoor ventilation position is fixed.
6	INTAKE ACTUACOR	Voltage ≤ 0.1V or Voltage ≥ 4.9V	In case of indoor ventilation mode : Indoor ventilation position is fixed.
7	AUTO DEFOGGING SENSOR (relative humidity)	OPEN / SHORT	Relative humidity : 0 %
8	Engine coolant temperature	OPEN / SHORT	-2°C
9	ECV Feedback	OPEN	ECV output OFF

- Replacement

1.Disconnect the negative (-) battery terminal.

2.Remove the front monitor.(Refer to Body Electrical System - "Front Monitor")

3.Loosen the mounting screw, remove the heater & A/C control unit (A).

4.Install in the reverse order of removal.

• Replace any damaged clips.

• Make sure the connector is connected properly.

Heater & A/C Control Unit (Manual)

- Component Connector Pin Function Pin NoConnector A (Blower)Connector B (Main) 1LowBattery (+) 2CommonISG B+ 3GroundILL+ (TAIL) 4Middle LowSensor REF (+5V) 5Middle HighMode control actua ...

Heater Control Unit

- Components Location 1. Heater control unit - Component [Connector Pin Function] Pin NoConnector AConnector B 1Driver's mode control actuator feedbackSensor ground 2Intake actuator ...

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