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: Troubleshooting

Troubleshooting Ignition System SymptomSuspect AreaRemedyEngine will not start or is hard to start (Cranks OK)Ignition lock switchInspect ignition lock switch, or replace as requiredIgnition coilInspect ignition coil, or replace as requiredSpark plugsInspect spark plugs, or replace as requiredIgnition wiring disconnected or brokenRepair wiring, or replace as requiredRough idle or stallsIgnition wiringRepair wiring, or replace as requiredIgnition coilInspect ignition coil, or replace as requiredEngine hesitates/poor accelerationSpark plugs and spark plug cablesInspect spark plugs / cable, or replace as requiredIgnition wiringRepair wiring, or replace as requiredPoor mileageSpark plugs and spark plug cablesInspect spark plugs / cable, or replace as required Charging System SymptomSuspect AreaRemedyCharging warning indicator does not light with ignition switch "ON" and engine off...

Hyundai Sonata LF 2014-2019 Service Manual: Side Impact Sensor (SIS) Description and Operation