Hyundai Elantra (CN7): Controller / Heater & A/C Control Unit (DATC)

Hyundai Elantra (CN7) 2021-2025 Service Manual / Heating, Ventilation and Air Conditioning / Controller / Heater & A/C Control Unit (DATC)

Components and components location

Components

[This illustration shows the LHD type. RHD type is symmetrical.]

[Connector A]

Pin No	Function	Pin No	Function
1	Battery	9	IGN2
2	ILL+ (TAIL)	10	ISG Battery (+)
3	-	11	IGN1
4	LIN BUS	12	HTD
5	-	13	-
6	-	14	-
7	-	15	-
8	RHEO (ILL-)	16	Ground

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	Incar sensor OPEN
12	Incar sensor SHORT
13	Ambient sensor OPEN
14	Ambient sensor SHORT
17	Evaporator sensor OPEN
18	Evaporator sensor SHORT
19	Driver temp door potentionmeter OPEN or SHORT
20	Driver temp door potentionmeter Error
21	Mode door potentionmeter OPEN or SHORT
22	Mode door potentionmeter Error
23	Auto defog sensor OPEN
24	Auto defog sensor SHORT
25	Intake door potentionmeter OPEN or SHORT
26	Intake door potentionmeter Error
32	Passenger temp door potensionmeter OPEN or SHORT
33	Passenger temp door potention meter Error
45	APT CAN Signal Error
47	RPM CAN Signal Error
48	Vehicle speed CAN Signal Error
49	Engine coolant temprature CAN Signal Error
50	Cluster ionizer fault
71	ECV Fault (OPEN)

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	Mode door potentiometer	Open or Short	Fix vent position, while selecting vent mode. Fix defrost position, while selecting all except vent mode.
5	Temperature door potentiometer (MTC)	Open or Short	If temperature setting 1 - 7 step, fix at maximum cooling position. If temperature setting 8 - 15 step, fix at maximum heating position.
6	Temperature door potentiometer (DATC)	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.
7	Intake door potentiometer	Open or Short	Fix vent position, while selecting vent mode. Fix defrost position, while selecting all except vent mode.
8	Engine RPM	FFh or NO reception	A/C OFF (Control with the value of 650 rpm)
9	Vehicle speed	FFh or NO reception	A/C OFF
10	Engine coolant temperature	FFh or NO reception	Control with the value of - 2°C(28.4°F)
11	APS	FFh or NO reception	Control with the value of 5%
12	R-TQACNAPVC (Max Torque limitation of A/C Compressor)	FFh or NO reception	A/C OFF (Control with the value of 0 Nm)
13	R-PACNC (APT Sensor Output Value)	FFh or NO reception	A/C OFF (Control with the value of 0 Nm)
14	RLY-AC (Activation of air conditioner compressor relay)	FFh or NO reception	FFh

Replacement

1.	Disconnect the negative (-) battery terminal.

2.	Remove the crash pad lower panel. (Refer to Body (Interior and Exterior) - "Crash Pad Lower Panel")

3.	Remove the steering column shroud upper panel (A).

4.	Remove the gear knob & boots (A) pull both of it up.

5.	Using a screwdriver or remover, remove the floor console side garnish (A).

6.	Using a screwdriver or remover, remove the console upper cover (A).

7.	Press the lock pin, separate the console upper cover connector (A).

8.	Using a screwdriver or remover, remove the crash pad garnish [CTR] (A).

9.	After loosening the mounting screws, remove the A/C & heater controller unit (A).

10.	Disconnect the A/C & heater controller connector (A) and hose (B).

11.

To install, reverse the removal procedure.

•	Make sure the connector are connected in properly.

•	Replace any damaged clips.

❮Heater & A/C Control Unit (Manual)

Components and components location Components[This illustration shows the LHD type. RHD type is symmetrical.][Connector A] Pin No Function Pin No Function 1Low (Register specifications)4Middle Low (Register specifications)2Common (Register specifications)5Middle High (Register specifications)3Ground (Register specifications)6High (Register specifications)[Connector B] Pin No Function Pin No Function 1Battery (+)21IGN22ISG B+22IGN13ILL+ (TAIL)23Blower IS (PWM specifications)4Sensor REF (+5V)24-5Mode control actuator (Feedback)25-6Temperature control actuator (Feedback)26-7Intake actuator (Feedback)27Blower Max.

Heater Control Unit❯

Components and components location Component Location1. Heater control unitComponents[Connector A] Pin No Function Pin No Function 1Mode control actuator (Feedback)21Mode control actuator (Vent)2Intake actuator (Feedback)22Mode control actuator (DEF)3Passenger's temperature control actuator 23Intake actuator (FRE)4Driver's temperature control actuator 24Intake actuator (REC)5DEF actuator feedback25Passenger's temperature control actuator (Cool)6Ionizer diagnosis26Passenger's temperature control actuator (Warm)7-27Driver's temperature control actuator (Cool)8Photo sensor (-) [LH]28Driver's temperature control actuator (Warm)9Photo sensor (-) [RH]29DEF actuator (Open)10-30DEF Driver's temperature control actuator (Coles)11Auto defoging sensor (SDA)31-12Auto defoging sensor (SCL)32-13Auto defoging sensor glass temperature33-14AMB sensor (+)34P_CAN Low15EVAP sensor (+)35P_CAN High16-36Clean signal17-37-18-38-19-39-20-40Ground[Connector B] Pin No Function Pin No Function 1Ground13Ground2Sensor ground14ECV (-) Ground3FET (Gate) (Power mosfet specifications)15ECV (+)4FET (Drain feedback) (Power mosfet specifications)16-5Blower motor (+) (Power mosfet specifications)17-6Blower INH (PWM specifications)18-7Blower IS (PWM specifications)19PTC relay (Gasoline PTC specifications)8Blower PWM IN (PWM specifications)20-9Sensor REF (+5V)21-10-22LIN BUS (PM Sensor)11-23IGN112Battery24IGN2 Repair procedures Replacement1.

Other information:

Hyundai Elantra (CN7) 2021-2025 Service Manual: Heater & A/C Control Unit (Manual)

Hyundai Elantra (CN7) 2021-2025 Service Manual: Repair procedures