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).

    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: Mode Control Actuator

    Description and operation DescriptionThe mode control actuator is located at the heater unit.It adjusts the position of the mode door by operating the mode control actuator based on the signal of the A/C control unit. Pressing the mode select switch makes the mode control actuator shift in order of Vent → Bi-Level → Floor → Mix.

    Hyundai Elantra (CN7) 2021-2026 Service Manual: Components and components location

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