Hyundai Sonata LF Quiz
Heating, Ventilation, and Air Conditioning

Heater and A/C Control Unit (Manual) Components and Component Location

In this manual: Heating, Ventilation, and Air Conditioning
General Information — 9Engine Mechanical System — 90Engine Electrical System — 58Emission Control System — 24Engine Control System/Fuel System — 114Drive Shaft and Axle — 15Suspension System — 35Steering — 19Restraints — 50Brake System — 54Body (Interior and Exterior) — 213Body Electrical System — 241Heating, Ventilation, and Air Conditioning — 56DCT (Dual Clutch Transmission) System — 52
~1min read

Components

Connector [A]
Pin No. Function Pin No. Function
1 ILL+ (TAIL) 21 Ground (+) Lock
2 REF Sensor (+5V) 22 HTD
3 Mode Control Actuator (Vent) 23 Rear Heater 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 Temperature Control Actuator (Cool) 29 EVAP Sensor (+)
10 Driver Temperature Control Actuator (Warm) 30 Fan MAX Signal
11 Driver Temperature Control Actuator (Feedback) 31 Fan ON Signal
12 Driver Seat Heater Indicator (Low) 32 -
13 Driver Seat Heater Indicator (Middle) 33 -
14 Driver Seat Heater Indicator (High) 34 -
15 Passenger Seat Heater Indicator (Low) 35 -
16 Driver Seat Heater Switch 36 -
17 Passenger Seat Heater Switch 37 -
18 Driver Seat Heater Switch 38 -
19 Passenger Seat Heater Switch 39 -
20 ILL- (REO) 40 Sensor Ground

Connector [B]
Pin No. Function Pin No. Function
1 Ground 9 Ground
2 Driver Seat Ventilation Indicator (Low) 10 -
3 Driver Seat Ventilation Indicator (Medium) 11 -
4 Driver Seat Ventilation Indicator (High) 12 Passenger Seat Heater Indicator (Medium)
5 Passenger Seat Ventilation Indicator (Low) 13 Passenger Seat Heater Indicator (High)
6 Passenger Seat Defroster Indicator (Medium) 14 -
7 Passenger Seat Ventilation Indicator (High) 15 IGN1
8 IGN2 16 Battery (+)

Connector [C]
Pin No. Function Pin No. Function
1 Low 4 Medium Low
2 General 5 Medium High
3 Ground 6 High

Test yourself

A quick Hyundai Sonata LF quiz: every answer comes with an explanation and a link to the manual page.