Hyundai Sonata LF: Controller / Heater & A/C Control Unit (Manual) Components and Components Location

Hyundai Sonata LF 2014-2019 Service Manual / Heating, Ventilation and Air Conditioning / Controller / Heater & A/C Control Unit (Manual) Components and Components Location

Components

Connector [A]
Pin NO
Function
Pin NO
Function
1
ILL+ (TAIL)
21
Detent OUT (+)
2
Sensor REF (+5V)
22
HTD
3
Mode control actuator (Vent)
23
Rear defog switch
4
Mode control actuator (Defrost)
24
C_CAN High
5
Mode control actuator (Feedback)
25
C_CAN Low
6
Intake actuator (Fresh)
26
ECV+
7
Intake actuator (Recirculation)
27
ECV- (Ground)
8
Intake actuator (Feedback)
28
AMB Sensor (+)
9
Driver's temperature control actuator (Cool)
29
EVAP Sensor (+)
10
Driver's temperature control actuator (Warm)
30
Blower MAX signal
11
Driver's temperature control actuator (Feedback)
31
Blower ON signal
12
Driver's seat heat indicator (Low)
32
-
13
Driver's seat heat indicator (Mid)
33
-
14
Driver's seat heat indicator (High)
34
-
15
Passenger's seat heat indicator (Low)
35
-
16
Driver's seat heat switch
36
-
17
Passenger's seat heat switch
37
-
18
Driver's cool switch
38
-
19
Passenger's cool switch
39
-
20
ILL- (RHEO)
40
Sensor ground

Connector [B]
Pin NO
Function
Pin NO
Function
1
Ground
9
Ground
2
Driver's seat vent indicator (Low)
10
-
3
Driver's seat vent indicator (Mid)
11
-
4
Driver's seat vent indicator (High)
12
Passenger's seat heat indicator (Mid)
5
Passenger's seat vent indicator (Low)
13
Passenger's seat heat indicator (High)
6
Passenger's seat vent indicator (Mid)
14
-
7
Passenger's seat vent indicator (High)
15
IGN1
8
IGN2
16
Battery (+)

Connector [C]
Pin NO
Function
Pin NO
Function
1
Low
4
Middle Low
2
Common
5
Middle High
3
Ground
6
High

    Controller

    ..

    Heater & A/C Control Unit (Manual) Repair procedures

    Replacement 1. Disconnect the negative (-) battery terminal. 2. Using a screwdriver or remover, remove the center fascia panel (A). 3. Disconnect the A/C & heater controller connectors (A)...

    Other information:

    Hyundai Sonata LF 2014-2019 Service Manual: Repair procedures


    General Inspection After or before servicing the EPS system, perform the troubleshooting and test procedure as follows. Compare the system condition with normal condition in the table below and if abnormal symptom is detected, perform necessary remedy and inspection...

    Hyundai Sonata LF 2014-2019 Service Manual: Repair procedures


    On-vehicle Inpection     • First of all, check for DTCs. If a DTC is present, perform troubleshooting in accordance with the procedure for that DTC. (Refer to DTC guide)     • Check that the battery cables are connected to the correct terminals...

    Categories

    read more

     
    Copyright © 2026 www.hsonatalf.org