Inspection Procedure

1. Check the DATA LIST for proper functioning of the front seat buckle switch LH.

   Main body ECU 

   DATA LIST
   
   

   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: GO TO NEXT STEP 

1. Remove the front seat inner belt LH.
2. Measure the resistance of the buckle switch.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION (1 OF 2)
   
   

   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 

Fig 1: Measuring Resistance Of Buckle Switch Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: GO TO NEXT STEP 

1. Disconnect the B11 buckle switch connector.
2. Disconnect the B7 ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION (2 OF 2)
   
   

   Tester Connection	Specified Condition
   B11-4 - B7-13 (DBKL/DBKLR)	Below 1 Ω
   B11-5 - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

Fig 2: Identifying B11 Buckle Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE