Front Passenger Side Seat Belt Warning Light Malfunction: Procedure

1. Check the vehicle condition.

   Result

   Result	Proceed to
   w/ Occupant Classification System	A
   w/o Occupant Classification System	B

B → See step   3 

A: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Recheck for DTC.
3. Proceed to the next step based on the inspection result.

   Result

   Result	Proceed to
   DTC output does not occur	A
   Multiplex communication system DTC output occurs	B
   CAN communication system DTC output occurs	C
   Airbag system DTC output occurs	D
   Occupant classification system DTC output occurs	E

B → See step   21 

C → See step   14 

D → See step   16 

E → See step   17 

A: Go to next step 

1. Remove the ECU-IG RH fuse from the main body ECU RH (cowl side junction block RH).
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   ECU-IG RH fuse	Always	Below 1 Ω

NG → REPLACE FUSE 

OK: Go to next step 

1. Operate the Techstream according to the steps on the display and select "Active Test".

   Combination Meter

   Tester Display	Test Part	Control Range	Diagnostic Note
   Front Passenger Side Seat Belt Remind	Passenger seat belt warning light	ON or OFF	-

   Result

   Result	Proceed to
   Passenger seat belt warning light condition cannot be switched by "Active Test" (w/o Multi-display)	A
   Passenger seat belt warning light condition cannot be switched by "Active Test" (w/ Multi-display)	B
   Passenger seat belt warning light condition can be switched by "Active Test" (w/ Occupant Classification System)	C
   Passenger seat belt warning light condition can be switched by "Active Test" (w/o Occupant Classification System)	D

B → See step   7 

C → See step   9 

D → See step   11 

A: Go to next step 

1. Disconnect the J54 integration control and panel assembly connector.
   Fig 1: Identifying J54 And J35 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the J35 combination meter connector.
3. Measure the resistance and voltage according to the value(s) in the table below.

   Standard Resistance

   Standard Voltage 

   Tester Connection	Condition	Specified Condition
   J54-13 (PBEW) - J35-3 (PBLT)	Always	Below 1 Ω
   J54-13 (PBEW) or J35-3 (PBLT) - Body ground	Always	10 kΩ or higher

   Tester Connection	Switch Condition	Specified Condition
   J54-4 (IG+) - Body ground	Engine switch on (IG)	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the integration control and panel assembly with the connector still connected. Refer to REMOVAL .
   Fig 2: Identifying J54 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery voltage from the wire harness back side between the terminals of the indicator, and check the lighting condition of the front passenger side seat belt warning light.

   Standard

   Measurement Condition	Specified Condition
   Battery position(+) → Terminal J54-4(IG+) Battery position(-) → Terminal J54-13(PBEW)	Front passenger side seat belt light comes on

NG → See step   18 

OK → See step   15 

1. Disconnect the J98 clock assembly connector.
   Fig 3: Identifying J98 And J35 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the J35 combination meter connector.
3. Measure the resistance and voltage according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J98-12 (PBEW) - J35-3 (PBLT)	Always	Below 1 Ω
   J98-12 (PBEW) - Body ground	Always	10 kΩ or higher
   J35-3 (PBLT) - Body ground	Always	10 kΩ or higher

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   J98-15 (IG+) - Body ground	Engine switch on (IG)	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the clock assembly with the connector still connected. Refer to REMOVAL .
   Fig 4: Identifying J 98 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery voltage from the wire harness back side between the terminals of the indicator, and check the lighting condition of the front passenger side seat belt warning light.

   Standard

   Measurement Condition	Specified Condition
   Battery position(+) → Terminal J98-15(IG+) Battery position(-) → Terminal J98-12(PBEW)	Front passenger side seat belt light comes on

NG → See step   13 

OK → See step   19 

1. Replace the gateway ECU. Refer to REMOVAL .

NEXT: Go to next step 

1. Check that the passenger seat belt warning light operates normally. Refer to ON-VEHICLE INSPECTION .

   OK

   The front passenger seat belt warning light normally operates.

NG → See step   20 

OK → END 

1. Disconnect the J35 combination meter connector.
   Fig 5: Identifying J35 And T3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the T3 front seat inner belt assembly RH connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   J35-4 (P/SB) - T3-1 (WS+)	Always	Below 1 Ω
   J35-4 (P/SB) - Body ground	Always	10 kΩ or higher
   T3-4 (E) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the occupant detection sensor (separate type front seat cushion pad). Refer to REMOVAL .
   Fig 6: Identifying Occupant Detection Sensor 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	Switch Condition	Specified Condition
   A-1 - A-3	Front passenger seat occupied	Below 100 Ω
   A-1 - A-3	Front passenger seat not occupied	1 MΩ or higher

NG → REPLACE OCCUPANT DETECTION SENSOR (SEPARATE TYPE FRONT SEAT CUSHION PAD) 

OK → See step   22