Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Driver Side Seat Belt Warning Light does not Operate

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Interior / Seat Belt / Seat Belt Warning System / Driver Side Seat Belt Warning Light does not Operate

DESCRIPTION

The seat belt warning light on the combination meter assembly illuminates, blinks or turns off in accordance with the state of the front seat inner belt assembly LH.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The seat belt warning system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

    Click here

PROCEDURE

1.

CHECK DTC OUTPUT (AIRBAG SYSTEM)

(a) Clear the DTCs.

Click here

Body Electrical > SRS Airbag > Clear DTCs

(b) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTCs are output

B
B

GO TO AIRBAG SYSTEM

A

2.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / SRS Airbag / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > SRS Airbag > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Left side Buckle SW

LH buckle switch

Unset, Set or NG

Unset: Seat belt not fastened

Set: Seat belt fastened

NG: Data is not determined

-
Body Electrical > SRS Airbag > Data List

Tester Display

Left side Buckle SW

Result

Proceed to

Unset or Set is displayed on the Techstream according to the driver seat belt condition

A

Unset or Set is not displayed correctly on the Techstream according to the driver seat belt condition

B

NG is displayed on the Techstream

C
A

REPLACE COMBINATION METER ASSEMBLY

B

REPLACE FRONT SEAT INNER BELT ASSEMBLY LH

C

REPLACE AIRBAG SENSOR ASSEMBLY

    On-vehicle Inspection
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    Front Passenger Side Seat Belt Warning Light Malfunction
    DESCRIPTION When the engine switch is turned on (IG), the occupant detection ECU sends signals to the airbag sensor assembly to indicate the state of the front seat inner belt assembly RH and also whe ...

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