Hyundai Elantra CN7: Controller

Seventh generation (CN7; 2021–2024) / Hyundai Elantra CN7 2021-2024 Workshop Manual / Heating, Ventilation and Air Conditioning / Controller

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
1	Low (Register specifications)	4	Middle Low (Register specifications)
2	Common (Register specifications)	5	Middle High (Register specifications)
3	Ground (Register specifications)	6	High (Register specifications)

[Connector B]

Pin No	Function	Pin No	Function
1	Battery (+)	21	IGN2
2	ISG B+	22	IGN1
3	ILL+ (TAIL)	23	Blower IS (PWM specifications)
4	Sensor REF (+5V)	24	-
5	Mode control actuator (Feedback)	25	-
6	Temperature control actuator (Feedback)	26	-
7	Intake actuator (Feedback)	27	Blower Max. On signal (Register specifications)
8	EVAP sensor (+)	28	-
9	AMB sensor (+)	29	PTC relay
10	Mode control actuator (Vent)	30	-
11	Mode control actuator (DEF)	31	-
12	Temperature control actuator (Cool)	32	-
13	Temperature control actuator (Warm)	33	P_CAN High
14	Intake actuator (FRE)	34	P_CAN Low
15	Intake actuator (REC)	35	Blower INH (PWM specifications)
16	HDT	36	Blower PWM (In) (PWM specifications)
17	-	37	ECV (+)
18	-	38	ECV (-)
19	Blower signal (On) (Register specifications)	39	Sensor ground
20	ILL- (RHEO)	40	Ground

Repair procedures

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.	Remove the parking brake cover (A).

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

11.

To install, reverse the removal procedure.

•	Make sure the connector are connected in properly.

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

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 Control Unit

Components and components location

Component Location

1. Heater control unit

Components

[Connector A]

Pin No	Function	Pin No	Function
1	Mode control actuator (Feedback)	21	Mode control actuator (Vent)
2	Intake actuator (Feedback)	22	Mode control actuator (DEF)
3	Passenger's temperature control actuator	23	Intake actuator (FRE)
4	Driver's temperature control actuator	24	Intake actuator (REC)
5	DEF actuator feedback	25	Passenger's temperature control actuator (Cool)
6	Ionizer diagnosis	26	Passenger's temperature control actuator (Warm)
7	-	27	Driver's temperature control actuator (Cool)
8	Photo sensor (-) [LH]	28	Driver's temperature control actuator (Warm)
9	Photo sensor (-) [RH]	29	DEF actuator (Open)
10	-	30	DEF Driver's temperature control actuator (Coles)
11	Auto defoging sensor (SDA)	31	-
12	Auto defoging sensor (SCL)	32	-
13	Auto defoging sensor glass temperature	33	-
14	AMB sensor (+)	34	P_CAN Low
15	EVAP sensor (+)	35	P_CAN High
16	-	36	Clean signal
17	-	37	-
18	-	38	-
19	-	39	-
20	-	40	Ground

[Connector B]

Pin No	Function	Pin No	Function
1	Ground	13	Ground
2	Sensor ground	14	ECV (-) Ground
3	FET (Gate) (Power mosfet specifications)	15	ECV (+)
4	FET (Drain feedback) (Power mosfet specifications)	16	-
5	Blower motor (+) (Power mosfet specifications)	17	-
6	Blower INH (PWM specifications)	18	-
7	Blower IS (PWM specifications)	19	PTC relay (Gasoline PTC specifications)
8	Blower PWM IN (PWM specifications)	20	-
9	Sensor REF (+5V)	21	-
10	-	22	LIN BUS (PM Sensor)
11	-	23	IGN1
12	Battery	24	IGN2

Repair procedures

Replacement

1.	Disconnect the negative (-) battery terminal.

2.	Remove the glove box. (Refer to Body (Interior and Exterior) - "Glove Box")

3.	Separate the heater control unit connector (A) and then loosen the mounitng screw, remove the heater control unit.

To install, reverse the removal procedure.

•	Make sure the connector are connected in properly.

Blower

Blower Unit Components and components location Component Location1. Blower unit assemblyComponents1. Blower unit assebmly2. Blower upper cover [LH]3. Duct seal4. Blower upper cover [RH]5. Intake a ...