Front Passenger Side Seat Belt Warning Light Malfunction: Procedure

1. Check for DTCs.

   Result

   Result	Proceed to
   DTC B1771 is not output	A
   DTC B1771 is output	B. Refer to DTC B1771: Passenger Side Buckle Switch Circuit Malfunction

B → GO TO OCCUPANT CLASSIFICATION SYSTEM 

A: Go to next step 

1. Disconnect the A7 and C6 connectors.
   Fig 1: Identifying Combination Meter And A/C Control Assembly 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
   A7-38 (SEAT) - C6-24	Always	Below 1 Ω
   C6-24 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the A7 connector.
2. Measure the voltage according to the value(s) in the table below.
   Fig 2: Identifying C6 Combination Meter Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Condition	Specified Condition
   C6-24 - Body ground	Turn the ignition switch to the ON position	11 to 14 V

NG → REPLACE A/C CONTROL ASSEMBLY 

OK: Go to next step 

1. Disconnect the A12 connector.
   Fig 3: Identifying Combination Meter And Center Airbag Sensor 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
   C6-22 - A12-13 (PBEW)	Always	Below 1 Ω
   C6-22 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the C6 connector.
2. Measure the voltage according to the value(s) in the table below.
   Fig 4: Identifying C6 Combination Meter Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Condition	Specified Condition
   C6-22 - Body ground	Turn the ignition switch to the ON position	8 to 16 V

NG → REPLACE COMBINATION METER ASSEMBLY 

OK: Go to next step 

1. Reconnect the A12 connector.
2. Measure the voltage according to the value(s) in the table below.
   Fig 5: Identifying Center Airbag Sensor Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Condition	Specified Condition
   A12-13 (PBEW) - Body ground	Turn the ignition switch to the ON position, sit on the front passenger seat, and front passenger seat belt is unfastened	Below 1 V
   A12-13 (PBEW) - Body ground	Turn the ignition switch to the ON position, sit on the front passenger seat, and front passenger seat belt is fastened	8 to 16 V

NG → REPLACE CENTER AIRBAG SENSOR ASSEMBLY 

OK → REPLACE COMBINATION METER ASSEMBLY