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: Evaporator Core Repair procedures

Replacement 1. Disconnect the negative (-) battery terminal. 2. After loosening the bolts remove the main crash pad and cowl cross bar assembly together. (Refer to Heater -"Heater Unit") 3. Remove the heater and blower assembly. (Refer to Heater -"Heater Unit") 4...

Hyundai Sonata LF 2014-2019 Service Manual: Intake Air Temperature Sensor (IATS) Description and Operation