Hyundai Sonata LF Quiz
Heating, Ventilation, and Air Conditioning

Heater and A/C Control Unit (DATC) 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
~2min read

Components

Connector [A]
Pin No. Function Pin No. Function
1 ILL+ (TAIL) 21 Ground (+) Lock
2 REF Sensor (+5V) 22 HTD (Rear Defogger Indicator)
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 Photo Sensor (-)_LH
11 Driver Temperature Control Actuator (Feedback) 31 Photo Sensor (-)_RH
12 Passenger Temperature Control Actuator (Cool) 32 -
13 Passenger Temperature Control Actuator (Warm) 33 -
14 Passenger Temperature Control Actuator (Feedback) 34 -
15 No K-Line 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 17 Ground
2 - 18 -
3 - 19 Driver Seat Heater Indicator (Low)
4 - 20 Driver Seat Heater Indicator (Middle)
5 - 21 Driver Seat Heater Indicator (High)
6 FET (Gate) 22 Passenger Seat Heater Indicator (Low)
7 FET Drain (Feedback) 23 Passenger Seat Heater Indicator (Medium)
8 - 24 Passenger Seat Heater Indicator (High)
9 - 25 Driver Seat Cooler Indicator (Low)
10 Steering Wheel Heater Switch 26 Driver Seat Cooling Indicator (Middle)
11 Steering Wheel Heater Indicator 27 Driver Seat Cooler Indicator (High)
12 Fan Motor (+) 28 Passenger Seat Cooler Indicator (Low)
13 - 29 Passenger Seat Cooler Indicator (Medium)
14 - 30 Passenger Seat Cooler Indicator (High)
15 IGN1 31 -
16 IGN2 32 Battery (+)

Test yourself

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