Hyundai Elantra (CN7): Controller / Heater Control Unit

Hyundai Elantra (CN7) 2021-2026 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.

4.
To install, reverse the removal procedure.
   
•
Make sure the connector are connected in properly.

    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: Rear Combination Lamp

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

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