Hyundai Tucson: In-car sensor

Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual / Heating, Ventilation and Air Conditioning (HVAC) / Air Conditioning System / In-car sensor

Components Location

  1. In-car sensor


  1. Disconnect the negative (-) battery terminal.
  2. Remove the crash pad center panel.

    (Refer to Body (Interior and Exterior) - "Crash Pad Center Panel")

  3. Using a screwdriver or remover, remove the in-car sensor (A).

  1. Install in the reverse order of removal.


  • Replace any damaged clips (pin-type retainers).
  • Make sure that each of the assembly components operates properly.


  1. The photo sensor is located at the center of the defrost nozzles.
  2. The photo sensor contains a photovoltaic (sensitive to sunlight) diode. The solar radiation received by its light receiving portion, generates an electromotive force in proportion to the amount of radiation received which is transferred to the automatic temperature control module so that the solar radiation compensation will be performed.


The ambient temperature sensor is located at the front of the condenser and detects ambient air temperature. It is a negative type thermistor; resistance will increase with lower temperature, and decrease with higher temperature.

The sensor output will be used for discharge temperature control, temperature regulation door control, blower motor level control, mix mode control and in-car humidity control.



  • If the ambient temperature is below 1.0ºC (33.8ºF), the A/C compressor will stop.
  • The compressor will operate manually.


  1. Check the resistance of the ambient temperature sensor between terminals 1 and 2 whether it changes by changing the ambient temperature.


  1. Ambient Sensor (+)
  2. Sensor ground


  1. Disconnect the negative (-) battery terminal.
  2. Remove the front bumper assembly.

    (Refer to Body - "Front Bumper Assembly")

  3. Disconnect the connector (A) and then remove the ambient temperature sensor (B)

  1. Install in the reverse order of removal.


The auto defogging sensor is installed on the front window glass. The sensor judges and sends signal if moisture occurs to blow out wind for defogging. The air conditioner control module receives signal from the sensor and restrains moisture and eliminate defog by controlling the intake actuator, A/C, auto defogging actuator, blower motor rpm, and mode actuator.


  1. Disconnect the negative (-) battery terminal.
  2. Remove the inside rear view mirror cover (A).

  1. Remove the rain sensor cover (A).

  1. Separate the auto defogging sensor connector (A) and remove the auto defogging sensor (B).

  1. Install in the reverse order of removal.


Monitor the air quality inside the vehicle in real time (PM sensor) and display the status on the screen.

Automatically operate when fine dust concentration is high (Condition: Bet mode + A/C ON + 3rd speed or higher)


     PM sensor

    Components Location PM sensor Replacement Disconnect the negative (-) battery terminal. Remove the crash pad lower panel. (Refer to Body (Interior and Exterior) - "Crash Pad Lower Panel") Loosen the mounting screw, remove


     Heater unit assembly

    Component Location Heater unit assembly Components Heater unit assembly Heater core cover Heater core assembly Mode control actuator LH DEF duct seal Evaporator assembly Flange seal Heater NVH pad Temperature contro


     Crash pad side cover

    Component Location LH Crash pad side cover LH RH Crash pad side cover RH Replacement WARNING When removing with a flat-tip screwdriver or remover, wrap protective tape around the tools to prevent damage to components.

     Parking Distance Warning (PDW)

    Description PDW consists of 8 sensors (front: 4 units, rear : 4 units) that are used to detect obstacles and transmit the result in three separate warning levels, the first, second and third to IBU via LIN communication. IBU decides the