Hyundai Tucson LM Quiz
Heating, Ventilation, and Air Conditioning

Heater and Air Conditioning Control Unit (Dual) Repair Procedures

In this manual: Heating, Ventilation, and Air Conditioning
General Information — 1Engine Mechanical System — 44Engine Electrical System — 45Emission Control System — 24Engine Control System/Fuel System — 93Clutch System — 13Manual Transmission — 18Automatic Transmission — 87Four-Wheel Drive (4WD) System — 26Drive Shaft and Axle — 29Suspension System — 35Steering — 20Restraints — 47Brake System — 36Body (Interior and Exterior) — 53Body Electrical System — 202Heating, Ventilation, and Air Conditioning — 58
15steps
~90min
4/5difficulty
Done 0 of 15

Self-Diagnosis

  1. Self-Diagnosis Procedure
  2. How to Read Self-Diagnostic Code: After the display panel blinks three times every 0.5 seconds, the corresponding trouble code blinks on the set temperature display panel every 0.5 seconds and shows two digits. The codes are displayed in numeric format. Trouble Code
    Display Description of Malfunction
    00 Normal
    11 In-Car Sensor Open
    12 In-Car Sensor Short Circuit
    13 Ambient Sensor Open
    14 Ambient Air Sensor Short Circuit
    17 Evaporator Sensor Open
    18 Evaporator Sensor Short Circuit
    19 Air Temperature Door Potentiometer Open/Short - Actuator
    20 Air Temperature Door Potentiometer Malfunction - Actuator
    21 Mode Door Potentiometer Open/Short
    22 Mode Door Potentiometer Malfunction
    25 Intake Door Potentiometer Open
    26 Intake Door Potentiometer Short Circuit
    32 Air Temperature Door Potentiometer Open/Short - Passenger
    33 Air Temperature Door Potentiometer Malfunction - Passenger
    45 APT CAN signal error
    46 -
    47 RPM CAN Signal Malfunction
    48 Vehicle Speed CAN Signal Malfunction
    49 Engine Coolant Temperature CAN Signal Malfunction
    50 Cluster Ionizer Generator Malfunction
  3. Trouble Code Display
    1. Continuous Operation: One DTC.
    2. Continuous Operation: More than two DTCs.
    3. STEP Operation
      A. Normal code or one trouble code is the same as continuous operation.
      B. More than two DTCs.
  4. If any diagnostic trouble codes are displayed during the inspection, check the causes of the malfunction by referring to the DTC troubleshooting.
  5. Fail-safe
    1. In-Car Temperature Sensor: Check with value of 23 °C
    2. Ambient Temperature Sensor: Check with value of 20 °C
    3. Evaporator Temperature Sensor: Check with value of -2°C (28.4°F)
    4. Water Temperature Sensor: Check with value of 85 °C
    5. Temperature control actuator (air mix potentiometer): If the temperature setting is 17°C-24°C, 5 °C, lock in the maximum cooling position. If the temperature setting is 25°C-32°C, lock in the maximum heating position.
    6. Mode Control Actuator (Direction Potentiometer): Fix in the vent position when the vent mode is selected. Fix in the defrost position when any mode other than vent is selected.
    7. Intake Control Actuator: Fix in the fresh air position when fresh air mode is selected. Fix in the recirculation position when recirculation mode is selected.

Replacement

  1. Disconnect the negative (-) battery terminal.
  2. Remove the lower cover (A).
  3. Remove the console upper cover (B).
  4. Disconnect the connectors (A).
  5. Using a screwdriver, remove the center panel lower cover (A).
  6. Using a screwdriver, remove the center panel lower switch assembly (A).
  7. Disconnect the connectors and remove the center panel lower switch assembly (A).
  8. Loosen the control panel mounting screws and remove the control panel (A).
  9. Disconnect the connectors (A).
  10. Install in the reverse order of removal.

Test yourself

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