Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM0000018I0007X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: SEAT BELT: SEAT BELT WARNING SYSTEM: Buckle Switch Circuit; 2007 MY LX470 [08/2006 -        ]

Buckle Switch Circuit

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

READ VALUE USING INTELLIGENT TESTER (DRIVER SEAT BUCKLE SWITCH)

(a) Check the DATA LIST for proper functioning of the front seat buckle switch LH.

Main body ECU:

Item

Measurement Item / Display (Range)

Normal Condition

Diagnostic Note

D SEAT BUCKL SW

Driver seat buckle switch

ON: Driver seat buckle switch is ON

OFF: Driver seat buckle switch is OFF

-

OK:

Condition signal can be displayed.

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT FRONT SEAT INNER BELT ASSEMBLY LH (DRIVER SEAT BUCKLE SWITCH)

(a) Remove the front seat inner belt LH.

(b) Measure the resistance of the buckle switch.

Standard resistance:

Tester Connection

Condition

Specified Condition

4 - 5

Seat belt is unfastened

Below 1 Ω

4 - 5

Seat belt is fastened

1 MΩ or higher
NG

REPLACE FRONT SEAT INNER BELT ASSEMBLY LH

OK

3.

CHECK WIRE HARNESS (INNER BELT - ECU AND BODY GROUND)

(a) Disconnect the B11 inner belt connector.

(b) Disconnect the B7 ECU connector.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:

Tester Connection

Specified Condition

B11-5 - B7-13 (DBKL/DBKLR)

Below 1 Ω

B11-4 - Body ground

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE