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

Hyundai Elantra (CN7) 2021-2026 Service 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).

❮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 1Battery9IGN22ILL+ (TAIL)10ISG Battery (+)3-11IGN14LIN BUS12HTD5-13-6-14-7-15-8RHEO (ILL-)16Ground Repair procedures Self Diagnosis1.

Other information:

Hyundai Elantra (CN7) 2021-2026 Service Manual: Repair procedures

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