LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2008 >> LX 570 >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Seat Belt >> Seat Belt Warning System >> System Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

System Description

  1. SEAT BELT WARNING SYSTEM DESCRIPTION 

    If a seat belt is not fastened, this system flashes the seat belt warning light or sounds the seat belt warning buzzer as a reminder.

    1. Driver side seat belt warning light:

      When the driver seat belt is not fastened with the engine switch on (IG), the driver side seat belt warning light on the combination meter comes on to inform the driver. The center airbag sensor detects the driver seat belt status and sends signals to the combination meter using the CAN.

    2. Front passenger side seat belt warning light: When the passenger seat belt is not fastened with the engine switch on (IG) and the passenger seat occupied, the passenger side seat belt warning light on the display and navigation module display*1 (multi-display*2) blinks. The occupant classification ECU detects the front passenger side seat belt status.

      HINT:

      *1: w/ Navigation System

      *2: w/o Navigation System

    3. Seat belt warning buzzer:

      When the vehicle is driven at approximately 20 km/h (12.5 mph) or more while the driver or front passenger seat belt is not fastened, the seat belt warning buzzer in the combination meter sounds at an interval of 1.2 seconds for 30 seconds.

  2. FUNCTION OF MAIN COMPONENT 

    The following functions are available.

    MAIN COMPONENT FUNCTION CHART

    Component Function
    Front seat inner belt LH (driver side buckle switch) Informs center airbag sensor of driver seat belt condition (fastened or unfastened)
    Front seat inner belt RH (passenger side buckle switch) Informs center airbag sensor of front passenger seat belt condition (fastened or unfastened)
    Occupant detection sensor Informs center airbag sensor of front passenger seat condition (occupied or unoccupied)
    Driver side seat belt warning light If driver seat belt is unfastened and engine switch is on (IG), combination meter flashes seat belt warning light of combination meter as reminder
    Front passenger side seat belt warning light When front passenger seat is occupied and engine switch is on (IG), if passenger seat belt is unfastened, combination meter flashes seat belt warning light of multi-display as reminder
    Seat belt warning buzzer If driver or passenger seat belt is unfastened and engine switch is on (IG), combination meter sounds buzzer as reminder
  3. SYSTEM OPERATION 
    1. Driver side seat belt warning light
      1. When the driver seat belt is not fastened with the engine switch on (IG), the driver side seat belt warning light on the combination meter comes on to inform the driver. The center airbag sensor detects the driver seat belt status and sends signals to the combination meter using CAN.
    2. Front passenger side seat belt warning light
      1. When the passenger seat belt is not fastened with the engine switch on (IG) and the passenger seat occupied, check that the front passenger side seat belt warning light on the multi-display blinks. The occupant classification ECU detects the front passenger side seat belt status.
scientia non olet · About LEMON Manuals