Hyundai Tucson Quiz
Heating, Ventilation and Air Conditioning

Heating and Air Conditioning Control Unit (Manual)

In this manual: Heating, Ventilation and Air Conditioning
General Information — 17Engine Mechanical System — 51Engine Electrical System — 26Emission Control System — 23Engine/Fuel Control System — 44Clutch System — 12MANUAL TRANSMISSION SYSTEM — 12AUTOMATIC TRANSMISSION SYSTEM — 42Four-Wheel Drive (4WD) System — 14Drive Shaft and Axle — 22Suspension System — 30Steering System — 16Restraint — 21Braking System — 47Body Work (Interior and Exterior) — 145Body Electrical System — 162Heating, Ventilation and Air Conditioning — 39
6steps
~36min
2/5difficulty
Done 0 of 6

Components and Component Location

COMPONENTS

CONNECTOR [A]
PIN Function PIN Function
1 Medium Low 4 High
2 Medium High 5 -
3 Ground 6 Down

Connector "B"
PIN Function PIN Function
1 Battery (+) 21 ALL1
2 ECL+ (Rear) 22 SS ISG
3 ALL2 23 -
4 Mode Control Actuator (Event) 24 Rear Window Defogger Switch (Bottom)
5 Mode Control Actuator (Def) 25 HTD (Rear Window Defogger Indicator)
6 Temperature Control Actuator (Cold) 26 -
7 Temperature Control Actuator (Hot) 27 -
8 Intake Actuator (Fresh Air) 28 C_CAN - HIGH
9 Intake Actuator (Recirculation) 29 C_CAN - LOW
10 (Feedback) Mode Control Actuator 30 EVAPORATOR SENSOR (+)
11 (Feedback) Temperature Control Actuator 31 AMB Sensor (+)
12 Intake Actuator (Feedback) 32 -
13 Trigger Signal 33 Positive (Low) Temperature Index Enable Signal
14 - 34 PTC Relay 2
15 Air Duct Feedback 35 PTC Relay 3
16 - 36 -
17 - 37 ECV (-) (Ground)
18 - 38 ECV+
19 - 39 Blower Common Signal (-)
20 ECL-(REO) 40 Ground

Connector (C)
PIN Function PIN Function
1 Setting Sensor (+5V) 13 Passenger Seat Cooling Indicator (Bottom)
2 Driver Seat Heater Switch 14 Passenger Seat Heater Switch
3 Driver Seat Heater Indicator (Top) 15 Passenger Seat Heater Indicator (Top)
4 Driver Seat Heater Indicator (Middle) 16 Passenger Seat Heater Indicator (Middle)
5 Driver Seat Heater Indicator (Low) 17 Passenger Seat Heater Indicator (Bottom)
6 Driver Seat Cooling Switch 18 -
7 Driver Seat Cooling Indicator (Top) 19 -
8 Driver Seat Cooling Indicator (Middle) 20 -
9 Driver Seat Cooling Indicator (Bottom) 21 -
10 Passenger Seat Cooling Switch 22 -
11 Passenger Seat Cooling Indicator (Top) 23 Mass Air Flow Sensor
12 Passenger Seat Cooling Indicator (Middle) 24 Ground

Repair Procedures

REPLACEMENT

  1. Disconnect the negative (-) battery terminal.
  2. Using a screwdriver or removal tool, remove the center console panel switch (A).
  3. Disconnect the connector of the hazard warning switch (A).
  4. Loosen the mounting screws, then remove the heater and A/C control unit (A).
  5. Disconnect the air conditioner controller connector and heater connector (A).
  6. To install, perform the removal procedure in reverse order.

Test yourself

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