Front Passenger Side Seat Belt Warning Light Malfunction: Procedure

1. Disconnect the A28 connector.
   Fig 1: Identifying A28 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the operation of the warning light according to the table below.

   Standard

   Tester Connection	Condition	Specified Condition
   No connection	Ignition switch ON	Warning light OFF
   A28-2 (PBEW) - Body ground	Ignition switch ON	Warning light Blinks

NG → See step   3 

OK: Go to next step 

1. Connect the A28 connector.
2. Check the operation of the warning light according to the table below.

   Standard

   Condition	Bulb Condition	Result
   Ignition switch ON (Passenger does not sit on)	OFF	OK
   Ignition switch ON (Passenger sits on)	Blinks	OK
   Ignition switch ON (Passenger sits on and seat belt is fastened)	OFF	OK
   Ignition switch ON (Passenger sits on and seat belt is unfastened)	Blinks	OK

   Check with the auto cut off switch in the AUTO position (with airbag cut off switch).

NG → GO TO AIRBAG SYSTEM 

OK → REPLACE COMBINATION METER ASSEMBLY 

1. Disconnect the A28 and C11 connectors.
   Fig 2: Identifying A28 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   C9-13 (AIRBAG) - A28-2 (PBEW)	Always	Below 1 Ω
   C9-13 (AIRBAG) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the P28 and C9 connectors.
   Fig 3: Identifying P28 & C9 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   C9-12 (P SEAT BELT WARNING) - P28-4 (LAPL)	Always	Below 1 Ω
   C9-12 (P SEAT BELT WARNING) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the P28 connector.
   Fig 4: Identifying P28 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   P28-5 (LAPB)- Body ground	Ignition switch ON	10 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE COMBINATION METER ASSEMBLY