Meter / Gauge System Seat Belt Warning Light For Passenger Seat Does Not Operate

Body Electrical. Lexus Gs430, Gs300. Uzs190 Grs190
Meter. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK SUPPLEMENTAL RESTRAINT SYSTEM

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (SEAT BELT WARNING LIGHT FOR PASSENGER SIDE)

CHECK COMBINATION METER

INSPECT FUSE (ECU-IG RH, AM2, TV)

CHECK WIRE HARNESS (MULTI-DISPLAY - BATTERY AND BODY GROUND)

INSPECT MULTI-DISPLAY (SEAT BELT WARNING LIGHT FOR PASSENGER SIDE)

CHECK WIRE HARNESS (COMBINATION METER - MULTI-DISPLAY)

METER / GAUGE SYSTEM - Seat Belt Warning Light for Passenger Seat does not Operate


DESCRIPTION

When the engine switch is on (IG) and the passenger seat is occupied, the center airbag sensor communicates the status of the front seat inner belt (passenger side) to the combination meter using the BEAN line. When the seat belt is unfastened, the combination meter flashes the passenger side seat belt warning light on the multi-display. When the seat belt is fastened, the combination meter stops flashing the passenger side seat belt warning light.

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Meter.Meter / Gauge System.Meter / Gauge System Seat Belt Warning Light For Passenger Seat Does Not Operate


Lexus Gs430, Gs300. Uzs190 Grs190.Meter.Meter / Gauge System.Meter / Gauge System Seat Belt Warning Light For Passenger Seat Does Not Operate


Lexus Gs430, Gs300. Uzs190 Grs190.Meter.Meter / Gauge System.Meter / Gauge System Seat Belt Warning Light For Passenger Seat Does Not Operate


INSPECTION PROCEDURE

1.CHECK SUPPLEMENTAL RESTRAINT SYSTEM

  1. Check for supplemental restraint system (SRS) DTCs.

    Result:
    Result
    		Proceed to
    No SRS DTCs are output
    		A
    SRS DTCs are output
    		B


B
GO TO SUPPLEMENTAL RESTRAINT SYSTEM
A


2.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (SEAT BELT WARNING LIGHT FOR PASSENGER SIDE)

  1. Select the Active Test, use the intelligent tester to generate a control command, and then check that the seat belt warning light operates.

    Combination meter:

    Item
    		Test Details
    		Diagnostic Note
    Indicat. Lamp P-Seat Belt
    		Seat belt warning light for passenger side / OFF or ON
    		Confirm that vehicle is stopped and engine is idling
    OK:
    Seat belt warning light for passenger side operates normally.


NG
Go to step 3
OK

REPLACE CENTER AIRBAG SENSOR

3.CHECK COMBINATION METER

  1. Check that the entire combination meter operates normally.

    OK:
    Entire combination meter operates normally.


NG
GO TO COMBINATION METER
OK


4.INSPECT FUSE (ECU-IG RH, AM2, TV)

  1. Remove the ECU-IG RH and AM2 fuses from the cowl side junction block RH.

  1. Remove the TV fuse from the cowl side junction block LH.

  1. Measure the resistance of the fuses.

    Standard resistance:
    Below 1 Ω


NG
REPLACE FUSE
OK


5.CHECK WIRE HARNESS (MULTI-DISPLAY - BATTERY AND BODY GROUND)


    Lexus Gs430, Gs300. Uzs190 Grs190.Meter.Meter / Gauge System.Meter / Gauge System Seat Belt Warning Light For Passenger Seat Does Not Operate

  1. Disconnect the L46 Multi-display connector.

  1. Measure the voltage and resistance of the wire harness side connector.

    Standard voltage:
    Tester connection
    		Switch Condition
    		Specified Condition
    L46-3(IG) - Body ground
    		Engine switch on (IG)
    		10 to 14 V
    L46-1(+B1) - Body ground
    		Always
    		10 to 14 V
    Standard resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    L46-10(GND1) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


6.INSPECT MULTI-DISPLAY (SEAT BELT WARNING LIGHT FOR PASSENGER SIDE)

  1. Remove the multi-display.



  1. Apply battery voltage to the panel and check that the light illuminates.


    Lexus Gs430, Gs300. Uzs190 Grs190.Meter.Meter / Gauge System.Meter / Gauge System Seat Belt Warning Light For Passenger Seat Does Not Operate

    OK:
    Measurement Connection
    		Specified Condition
    Battery positive (+) → B-3 (IG)
    Battery negative (-) → A-8 (PBEW)
    		Seat belt warning light for passenger side illuminates


NG
REPLACE MULTI-DISPLAY
OK


7.CHECK WIRE HARNESS (COMBINATION METER - MULTI-DISPLAY)


    Lexus Gs430, Gs300. Uzs190 Grs190.Meter.Meter / Gauge System.Meter / Gauge System Seat Belt Warning Light For Passenger Seat Does Not Operate

  1. Disconnect the L31 meter connector.

  1. Disconnect the L48 multi-display connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    L31-31 (PBLT) - L48-8 (PBEW)
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE COMBINATION METER