Hyundai Elantra: Controller / Heater Control Unit

Hyundai Elantra (CN7) 2021-2025 Service Manual / Heating, Ventilation and Air Conditioning / Controller / 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.

Heater & A/C Control Unit (DATC)

C..

Advanced Driver Assistance System (ADAS)

Other information:

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Tire Rotation

To equalize tread wear, HYUNDAI recommends that the tires be rotated according to the maintenance schedule or sooner if irregular wear develops.

During rotation, check the tires for correct balance.

When rotating tires, check for uneven wear and damage. Abnormal wear is usually caused by incorrect tire pressure, improper wheel alignment, out-ofbalance wheels, severe braking or severe cornering. Look for bumps or bulges in the tread or side of the tire. Replace the tire if you find any of these conditions. Replace the tire if fabric or cord is visible. After rotation, be sure to bring the front and rear tire pressures to specification and check lug nut tightness (proper torque is 79~94 lbf·ft [11~13 kgf·m]).