Hyundai Tucson: Front Radar System - Inspection

Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual / Advanced Driver Assistance System (ADAS) / Front Radar System / Front Radar System - Inspection

Components Location

  1. Front radar unit
  2. Smart cruise control switch


Circuit Diagram

Circuit Diagram



Inspection procedure for vehicle with Forward Collision-Avoidance Assist and Smart Cruise Control system failure

  1. Check the bumper appearance for accident (check the vehicle appearance visually and see bumper replacement history).
  • In case of the vehicle was involved in an accident, there is a high possibility that the FCA radar is out of the original default position.
  1. Check for contamination of the radar sensor cover of the bumper.
  • If contaminated, there is a high possibility that the FCA system is
  1. After turning on the engine, check the FAC warning lamp and DTC.

    (Refer to the DTC diagnosis guide.)


  1. Turn ignition switch OFF and disconnect the negative (-) battery cable.
  2. Remove the front bumper assembly.

    (Refer to Body - "Front Bumper Assembly")

  3. Disconnect the front radar connector (A).

  1. Loosen the mounting nuts (A) and remove the front radar (B).

Front radar nuts : 9.5 - 10.5 N m (0.97 - 1.07 kgfm, 7.0 - 7.7 lb ft)



  1. To install, reverse the removal procedure.


The vertical installation angle of the unit must be within 1º = 0.4º. (not 0 degree)

*Before installing the bumper onto the vehicle, measure the vertical angle of the unit with a protractor as shown.

  1. Connect the GDS to Data Link Connector (DLC).
  2. Switch "ON" the ignition.
  3. Select "Vehicle. Model year, Engine, System".
  4. Select "Vehicle S/W Management".


Front Radar Installation Angle Checking / Adjustment Overview

FCA system is designed to help avoid a potential collision or reduce its impact when drivers applies inadequate, delayed or no brakes at all to avoid a collision.

In order for the radar sensor to operate correctly, it must be properly aligned parallel to the driving direction of the vehicle.For this reason, the radar sensor alignment procedure must be carried out whenever the sensor has been reinstalled or replaced with a new If the sensor alignment procedure is not performed in the conditions mentioned above, the smart cruise control system may not operate correctly.


The FCA radar sensor alignment is required when :

  • The FCA unit has been reinstalled or replaced with a new one.
  • The radar sensor or the surrounding paits have been impacted by collision.
  • The sensor cannot detect a vehicle in front.
  • The Steering Angle Sensor (SAS) has been replaced or adjusted.


If the sensor cannot detect the vehicle in front:

  • Park the vehicle on a level ground.
  • Set all tires according to the specified pressure.
  • Check wheel alignment.
  • Check that the front surface of the FCA unit is clean.


     Front Radar Sensor Alignment

    WARNING Adjustment may not be accurate if the vehicle and reflector are placed on different ground levels or on a slope. Perform in an area with minimum clearance of 8 m to the front. 4 m wide, and 1.2 m above the ground. Remove heavy o

     Remote control switch

    Components Remote control switch (LH : Audio) Remote control switch (RH : Trip + C'nuse) Circuit Diagram Trip+SCC+MSLA+LFA Inspection Check for resistance between terminals in right switch position. Trip/Cruise

     Rear Corner Radar System


     Steering wheel

    Electric Power Steering (EPS) The system assists you with steering the vehicle. If the vehicle is turned off or if the power steering system becomes inoperative, you may still steer the vehicle, but it will require increased steering effort.

     When Using the CVVD fixture

    When installing the CVVD assembly mounting bolts (M6), tighten sequence shown. Tightening torque : 1ST 4.9 - 6.9 N.m (0.5 - 0.7 kgf.m, 3.6 - 5.1 lb-ft) 2nd 9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft) Remove the CVVD fixture