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

for Preparation Click here


DESCRIPTION

The occupant detection sensor (separate type front seat cushion pad) detects if the passenger seat is occupied and sends signals to the combination meter assembly. The front seat inner belt (for front passenger) detects the passenger seat belt condition and sends signals to the combination meter assembly. After receiving the signals from the occupant detection sensor (separate type front seat cushion pad) and front seat inner belt (for front passenger), the seat belt warning light in the combination meter assembly will blink or go off.

WIRING DIAGRAM


B275873E01


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body / Combination Meter / Data List.

  1. Read the Data List according to the display on the intelligent tester.

    Combination Meter (Combination Meter Assembly) 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    P-Seatbelt Buckle SW
    		Front passenger seat belt buckle switch signal/ON or OFF
    		ON: Front passenger seat belt fastened
    OFF: Front passenger seat belt not fastened
    		-

    OK:
    ON or OFF appears on the tester screen according to the front passenger seat belt condition.



NG
Go to step 2
OK

REPLACE COMBINATION METER ASSEMBLY (Click here)  

2.CHECK HARNESS AND CONNECTOR (COMBINATION METER - FRONT SEAT INNER BELT - BODY GROUND)

  1. Disconnect the H19 combination meter assembly connector.

  1. Disconnect the Q20*1 or P25*2 front seat inner belt assembly (for front passenger) connector.

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

    1. *1: for LHD
    2. *2: for RHD

    Standard Resistance:
    for LHD 
    Tester Connection
    		Condition
    		Specified Condition
    H19-29 (P/SB) - Q20-3
    		Always
    		Below 1 Ω
    H19-29 (P/SB) - Body ground
    		Always
    		10 kΩ or higher
    Q20-2 - Body ground
    		Always
    		Below 1 Ω
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    H19-29 (P/SB) - P25-3
    		Always
    		Below 1 Ω
    H19-29 (P/SB) - Body ground
    		Always
    		10 kΩ or higher
    P25-2 - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT OCCUPANT DETECTION SENSOR (SEPARATE TYPE FRONT SEAT CUSHION PAD)


    B218574E01

  1. Remove the occupant detection sensor (separate type front seat cushion pad) (Click here).

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

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

    Text in Illustration 
    *a
    		Component without harness connected
    (Occupant Detection Sensor (Separate Type Front Seat Cushion Pad))



NG
REPLACE OCCUPANT DETECTION SENSOR (SEPARATE TYPE FRONT SEAT CUSHION PAD) (Click here)
OK


4.INSPECT FRONT SEAT INNER BELT ASSEMBLY (FOR FRONT PASSENGER)


    B271152E03

  1. Remove the front seat inner belt assembly (for front passenger) (Click here).

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

    Standard Resistance:
    for LHD 
    Tester Connection
    		Condition
    		Specified Condition
    Q20-3 - B-1
    		Always
    		Below 1 Ω
    Q20-2 - B-3
    		Front passenger seat belt unfastened
    		Below 1 Ω
    Q20-2 - B-3
    		Front passenger seat belt fastened
    		10 kΩ or higher
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    P25-3 - B-1
    		Always
    		Below 1 Ω
    P25-2 - B-3
    		Front passenger seat belt unfastened
    		Below 1 Ω
    P25-2 - B-3
    		Front passenger seat belt fastened
    		10 kΩ or higher

    Text in Illustration 
    *A
    		for LHD
    *B
    		for RHD
    *a
    		Component without harness connected
    (Front Seat Inner Belt Assembly (for Front Passenger))



NG
REPLACE FRONT SEAT INNER BELT ASSEMBLY (FOR FRONT PASSENGER) (Click here)
OK

REPLACE COMBINATION METER ASSEMBLY (Click here)