Hyundai Palisade (LX2): Controller / Heater & A/C Control Unit (DATC)

Hyundai Palisade (LX2) 2020-2026 Service Manual / Heating,Ventilation And Air Conditioning / Controller / Heater & A/C Control Unit (DATC)

Components and components location

Component

Hyundai Palisade. Components and components location

Connector Pin Function

Connector	PIN No	Pin Function	Connector	PIN No	Pin Function
A	1	Battery	A	21	IGN2
	2	ISG B+		22	IGN1
	3	ILL+ (TAIL)		23	Blower Motor (+)
	4	Sensor Ground REF (+5V)		24	Photo Sensor (-)_LEFT
	5	Mode Control Actuator Feedback		25	Photo Sensor (-)_RIGHT
	6	Temperature Actuator Feedback - Driver		26	Incar Sensor (+)
	7	Intake Actuator Feedback		27	Incar Motor (-)
	8	Evaporator Temperature Sensor (+)		28	PTC Relay 3
	9	Ambient Temperature Sensor (+)		29	PTC Relay 3
	10	Mode Control Actuator (Vent)		30	PTC On Signal
	11	Mode Control Actuator (Defrost)		31	Detent out (-)
	12	Temperature Control Actuator (Cool) - Driver		32	K - Line
	13	Temperature Control Actuator (Warm) - Driver		33	P_CAN High
	14	Intake Actuator (Fresh Air)		34	P_CAN Low
	15	Intake Actuator (Recirculated Air)		35	Mosfet (DRAIN F/B)
	16	HTD (Rear Defrost)		36	Mosfet (GATE)
	17	Rear Defogging Swich		37	ECV +
	18	Clean Signal		38	ECV -
	19	Ionizer Diagnosis		39	Sensor Ground
	20	ILL - (RHEO)		40	Ground

Connector	PIN No	Pin Function	Connector	PIN No	Pin Function
B	1	Temperature Control Actuator Feedback - Passenger	B	9	-
	2	Temperature Control Actuator (Cool) - Passenger		10	-
	3	Temperature Control Actuator (Warm) - Passenger		11	-
	4	Defogging Actuator Feedback		12	Defogging Sensor TEMP
	5	Defogging Actuator (Open)		13	Defogging Sensor SCK
	6	Defogging Actuator (Close)		14	Defogging Sensor Data
	7	-		15	-
	8	Seat Signal PWM - Driver		16	Ground

Repair procedures

Self Diagnosis

Self-diagnosis process.

Hyundai Palisade. Repair procedures

•	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.

Display	Fail description	Remarks
0	Normal
11	Interior Temperature Sensor Disconnection (OPEN, INCAR F/B Voltage ≥ 4.9V)
12	Interior Temperature Sensor Short Circuit (SHORT, INCAR F/B Voltage ≤ 0.1V)
13	External Temperature Sensor Disconnection (OPEN , AMBIENT F/B Voltage ≥ 4.9V)
14	External Temperature Sensor Short Circuit (SHORT, AMBIENT F/B Voltage ≤ 0.1V)
17	Evaporator Temperature Sensor Disconnection (OPEN, EVAP F/B Voltage ≥ 4.9V)
18	Evaporator Temperature Sensor Short Circuit (SHORT, EVAP F/B Voltage ≤ 0.1V)
19	Driver Seat Temperature Control Actuator Feedback Disconnection/Short Circuit (OPEN/SHORT) SHORT Range [TEMP F/B Voltage ≤ 0.1V] OPEN Range [TEMP F/B Voltage ≥ 4.9V]
20	Driver Seat Temperature Control Actuator Motor Constraint (Note that if both the target and constraint ranges fall within the MAX COOL range [0.1V < TEMP FB voltage ≤ 0.5V] and MAX WARM range [4.5V ≤ TEMP FB voltage < 4.9V], the error code 20 is not displayed because there is no longer any constraint. This will prevent MAX WARM and MAX COOL displaying the code 20 due to error margins of the Actuator and FATC.)	If the actuator cannot reach the desired control position in 10 seconds, then it is deemed constrained
21	Driver Seat Mode Actuator Feedback Disconnection/Short Circuit SHORT Range [DR MODE F/B Voltage ≤ 0.1V] OPEN Range [DR MODE F/B Voltage ≥ 4.9V]
22	Driver Seat Mode Actuator Motor Constraint (Note that if both the target and constraint ranges fall within the VENT range [0.1V < DR MODE FB voltage ≤ 0.5V] and DEF range [4.5V ≤ DR MODE FB voltage < 4.9V], the error code 22 is not displayed because there is no longer any constraint. This will prevent VENT and DEF displaying the code 22 due to error margins of the Actuator and FATC.)	If the actuator cannot reach the desired control position in 10 seconds, then it is deemed constrained
25	Internal/External Air Actuator Position Sensor Disconnection/Short Circuit SHORT Range [INTAKE F/B Voltage ≤ 0.1V] OPEN Range [INTAKE F/B Voltage ≥ 4.9V]
26	Internal/External Air Actuator Motor Constraint (Note that if both the target and constraint ranges fall within the FRE range [0.1V < INTAKE FB voltage ≤ 0.5V] REC range [4.5V ≤ INTAKE FB voltage < 4.9V], the error code 26 is not displayed because there is no longer any constraint. This will prevent FRE and REC displaying the code 26 due to error margins of the Actuator and FATC.)
32	Passenger Seat Temperature Control Actuator Feedback Disconnection/Short Circuit (OPEN/SHORT) SHORT Range [TEMP F/B Voltage ≤ 0.1V] OPEN Range [TEMP F/B Voltage ≥ 4.9V]
33	Passenger Seat Temperature Control Actuator Motor Constraint (Note that if both the target and constraint ranges fall within the MAX COOL range [0.1V < TEMP FB voltage ≤ 0.5V] and MAX WARM range [4.5V ≤ TEMP FB voltage < 4.9V], the error code 20 is not displayed because there is no longer any constraint. This will prevent MAX WARM and MAX COOL displaying the code 20 due to error margins of the Actuator and FATC.)	If the actuator cannot reach the desired control position in 10 seconds, then it is deemed constrained
45	APT CAN Signal Error
47	RPM CAN SIGNAL Error
48	Vehicle Speed CAN Signal Error
49	Engine coolant temperature CAN Signal Error

FAIL SAFE

NO	SIGNAL / ITEM	Failure Criteria	Alternative Value in Case of Failure	Remarks
1	AMB SENSOR	OPEN/SHORT	"--" displayed on the screen Alternative Control to 20°C
2	INCAR SENSOR	OPEN/SHORT	Fixed at 25°C
3	EVA SENSOR	OPEN/SHORT	Fixed at -2°C
4	TEMP DOOR POTENTION METER	OPEN/SHORT	For temperature set to 22°C or lower, move to the Cool location and fix it there. For temperature set to 22.5°C or higher, move to the Warm location and fix it there.
5	MODE DOOR POTENTION METER	OPEN/SHORT	Move to and fix the VENT position if VENT Mode is on Fix the DEF position movement if it is not in the "VENT Mode"
6	INTAKE DOOR POTENTION METER	OPEN/SHORT	For FRE selection, move to the FRE location and fix it there. For REC, move to the REC location and fix it there.
7	VS (Vehicle Speed)	FFh or Signal not received	1. Take alternative control based on VS_TCU(From TCU2) 2. When both VS and VS_TCU are FFH or not received, processing the Vehicle speed to FAIL(0 Kph alternative control)
8	VS_TCU (Vehicle speed calculated by TCU)	FFh or Signal not received	1. Take alternative control based on VS_TCU(From TCU2) 2. When both VS and VS_TCU are FFH or not received, processing the Vehicle speed to FAIL(0 Kph alternative control)
9	N (Engine Speed)	Signal not received	Fixed at 650 RPM
10	F_N_ENG (Error-engine speed signal)	01h or Signal not received	Fixed at 650 RPM
11	TPS (Throttle Position Signal)	FFh or Signal not received	Fixed at 0%
12	TEMP_ENG (Engine Coolant Temperature)	FFh or Signal not received	Fixed at 90°C (Include estimated torque calculation)
13	R_TqAcnApvC (Max Torque limitation of A/C Compressor)	FFh or Signal not received	Fixed at 0 Nm
14	R_PAcnC (APT Sensor Output Value)	FFh or Signal not received	Fixed at 0 hPa
15	R_NEngIdlTgC (Engine Idle Target Speed)	FFh or No Signal not received	Use the Replacement Tabel
16	SUNROOF ON/OFF (C_SunRoofOpenState)	Signal not received	Process the signal to C_SunRoofOpenState=0H (SUNROOF Interlocking Logic not working)

Replacement

•	When removing with a flat-tip screwdriver or remover, wrap protective tape around the tools to prevent damage to components.

•	Put on gloves to prevent hand injuries.

•	Take care not to bend or scratch the trim and panels.

1.	Disconnect the negative (-) battery terminal.

2.	Using a flat-tip screwdriver or remover and remove the console upper cover (A).

3.	Press the lock pin and separate the various connectors (A).

4.	Loosen the mounting screws and remove the heater & A/C control unit (A).

To install, reverse removal procedure.

•	Replace any damaged clips (or pin-type retainers).

•	Make sure the connector are connected in properly.

❮Controller

Heater & A/C Control Unit (Rear)❯

Components and components location Component Connector Pin Function Connector PIN No Pin Function Connector PIN No Pin Function A 1 Battery A 17 IGN2 2 ISG B+ 18 IGN1 3 ILL+ (TAIL) 19 Blower Motor (+) 4 Sensor Ground REF (+5V) 20 - 5 Mode Control Actuator Feedback 21 Mosfet (DRAIN F/B) 6 Temperature Actuator Feedback 22 Mosfet (GATE) 7 Mode Control Actuator (Vent) 23 Heater Switch _ LH 8 Mode Control Actuator (Defrost) 24 Indicator (HIGH) _ LH 9 Temperature Control Actuator (Cool) 25 Indicator (MID) _ LH 10 Temperature Control Actuator (Warm) 26 Indicator (LOW) _ LH 11 Detent out (-) 27 Heater Switch _ RH 12 K - Line 28 Indicator (HIGH) _ RH 13 LIN Left 29 Indicator (MID) _ RH 14 Lin Right 30 Indicator (LOW) _ RH 15 - 31 Sensor Ground 16 ILL - (RHEO) 32 Ground Repair procedures Replacement • When removing with a flat-tip screwdriver or remover, wrap protective tape around the tools to prevent damage to components.

Other information:

Hyundai Palisade (LX2) 2020-2026 Service Manual: Heater Core

Repair procedures Replacement 1. Disconnect the negative (-) battery terminal. 2. Remove the heater and blower assembly. (Refer to Heater - "Heater Unit") 3.

Hyundai Palisade (LX2) 2020-2026 Service Manual: Schematic diagrams