Hyundai Tucson: Rear Occupant Alert

Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual / Body Electrical System / Rear Occupant Alert


The system detects the passenger in the vehicle and prevents the driver from getting off the vehicle with the passenger in the

  • 1st warning: If you open the driver's door after you open and then close the rear passenger and turn the engine off, the system provides warning by showing message on the cluster and giving voice instruction.
  • 2nd warning
  1. The system detects the indoor movement using the rear occupant alert sensor installed on the head lining when the driver gets off the vehicle and locks all the doors.
  2. If any movement inside the vehicle is detected, horn and Hazard Warning Flasher are activated for 25 seconds and the mobile text message is sent.



  1. Rear Occupant Alert Sensor
  2. Integrated body control unit
  3. Cluster (Message pop-up and Voice)


  1. Disconnect the negative (-) battery terminal.
  2. Remove the cover (A) by using a flat-tip screwdriver.

  1. Disconnect the connector (A) and then remove the occupant alert sensor.



  1. Install the occupant alert sensor.
  2. Connect the negative (-) battery terminal.


     Immobilizer System

     TP Read Protocol

    Description The immobilizer system will disable the vehicle unless the proper ignition key is used, in addition to the currently available antitheft systems such as car alarms, the immobilizer system aims to drastically reduce the rate of auto

     Immobilizer System - Adjustment

    In the body electrical system, failure can be quickly diagnosed by using the vehicle diagnostic system (diagnostic tool). The diagnostic system (diagnostic tool) provides the following information. (1) Fault Code Searching : Checking fai


     Rear transverse trim

    Component Location Rear transverse trim Replacement WARNING When removing with a flat-tip screwdriver or remover, wrap protective tape around the tools to prevent damage to components. Put on gloves to prevent hand injuries.

     Crankshaft Position Sensor (CKPS)

    Description Crankshaft Position Sensor (CKPS) detects the crankshaft position and is one of the most important sensors of the engine control system. If there is no CKPS signal input, fuel is not supplied.That is, vehicle can't run without