SEAT BELT WARNING SYSTEM > Front Passenger Side Seat Belt Warning Light Malfunction

for Preparation Click here


DESCRIPTION

The center airbag sensor assembly detects the state of the front seat inner belt when the front passenger seat is occupied with the ignition switch ON. The center airbag sensor assembly transmits the front passenger seat belt state signal to the combination meter. If the front passenger seat belt is not fastened, the combination meter blinks the front seat belt warning light on the telltale light. If the seat belt is fastened, the warning light goes off.

WIRING DIAGRAM


B214258E01


INSPECTION PROCEDURE

NOTICE:
  1. Since the seat belt warning system has functions that use CAN communication, first confirm that there is no malfunction in the communication system by inspecting the CAN communication functions in accordance with How to Proceed with Troubleshooting. Then conduct the following troubleshooting procedure.
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.CHECK DTC OUTPUT

  1. Check for DTCs.
    Result 
    Result
    		Proceed to
    B1656/38 is not output
    		A
    B1656/38 is output
    		B



B
GO TO AIRBAG SYSTEM (Click here)
A


2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Enter the following menus: Body / Combination Meter / Active Test.

  1. According to the display on the tester, perform the Active Test.

    Combination Meter 
    Item
    		Test Part
    		Control Range
    		Diagnostic Note
    Front Passenger Side Seat Belt
    		Front passenger side seat belt warning light
    		ON/OFF
    		-

    OK:
    Passenger seat belt warning light condition can be switched by Active Test.



NG
Go to step 6
OK


3.CHECK HARNESS AND CONNECTOR (FRONT SEAT WIRE - COMBINATION METER AND BODY GROUND)


    B210260E01

  1. Disconnect the GM2 or GM1 front seat wire connector.

  1. Disconnect the D1 combination meter assembly connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    for LHD 
    Tester Connection
    		Condition
    		Specified Condition
    GM2-2 - D1-10 (P/SB)
    		Always
    		Below 1 Ω
    GM2-2 or D1-10 (P/SB) - Body ground
    		Always
    		10 kΩ or higher
    GM2-1 - Body ground
    		Always
    		Below 1 Ω
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    GM1-2 - D1-10 (P/SB)
    		Always
    		Below 1 Ω
    GM1-2 or D1-10 (P/SB) - Body ground
    		Always
    		10 kΩ or higher
    GM1-1 - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Front Seat Wire)
    *2
    		Front view of wire harness connector
    (to Combination Meter Assembly)
    *3
    		for LHD
    *4
    		for RHD

  1. Reconnect the front seat wire connector.

  1. Reconnect the combination meter assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.INSPECT FRONT SEAT WIRE


    B210261E01

  1. Remove the front seat wire.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A2 - B3
    		Always
    		Below 1 Ω
    A2 or B3 - Body ground
    		Always
    		10 kΩ or higher
    A1 - B1
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Component without harness connected
    (Front Seat Wire)
    *2
    		Connector A
    *3
    		Connector B

  1. Reinstall the front seat wire.



NG
REPLACE FRONT SEAT WIRE (Click here)
OK


5.INSPECT FRONT SEAT CUSHION PAD SUB-ASSEMBLY (OCCUPANT DETECTION SENSOR)


    B120668E02

  1. Disconnect the occupant detection sensor connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 - 3
    		Passenger seat is occupied
    		Below 100 Ω
    Passenger seat is not occupied
    		1 MΩ or higher

    Text in Illustration 
    *1
    		Component without harness connected
    (Occupant Detection Sensor)

  1. Reconnect the occupant detection sensor connector.



NG
REPLACE FRONT SEAT CUSHION PAD SUB-ASSEMBLY (OCCUPANT DETECTION SENSOR) (Click here)
OK

REPLACE COMBINATION METER ASSEMBLY (Click here)  

6.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - TELLTALE LIGHT ASSEMBLY)


    B210254E01

  1. Disconnect the D2 combination meter assembly connector.

  1. Disconnect the D65 telltale light assembly connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D2-16 (PBLT) - D65-7 (PBEW)
    		Always
    		Below 1 Ω
    D2-16 (PBLT) or D65-7 (PBEW) - Body ground
    		Always
    		10 kΩ or higher

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Telltale Light Assembly)
    *2
    		Front view of wire harness connector
    (to Combination Meter Assembly)

  1. Reconnect the combination meter assembly connector.

  1. Reconnect the telltale light assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.INSPECT TELLTALE LIGHT ASSEMBLY


    B214095E01

  1. Remove the telltale light assembly.

  1. Apply battery voltage to the terminals and check that the front passenger seat belt warning light illuminates.

    OK:
    Measurement Condition
    		Specified Condition
    Positive battery - Terminal 6 (lG+)
    Negative battery - Terminal 7 (PBEW)
    		Front passenger seat belt warning light Illuminates

    Text in Illustration 
    *1
    		Component without harness connected
    (Telltale Light Assembly)

  1. Reinstall the telltale light assembly.



NG
REPLACE TELLTALE LIGHT ASSEMBLY (Click here)
OK

REPLACE COMBINATION METER ASSEMBLY (Click here)