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Home >> Lexus >> 2012 >> IS 250C V6-2.5L (4GR-FSE) >> Repair and Diagnosis >> Restraints and Safety Systems >> Seat Belt Systems >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Front Passenger Side Seat Belt Warning Light Malfunction

Front Passenger Side Seat Belt Warning Light Malfunction





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

DESCRIPTION

* w/ Occupant Classification System

The occupant classification ECU detects the state of the front seat inner belt assembly RH and occupant classification sensor when the front passenger side seat is occupied with the engine switch on (IG). If the front passenger side seat belt is not fastened, the front passenger side seat belt warning light on the clock assembly*1 or integration control and panel assembly*2 blinks. If the seat belt is fastened, the warning light goes off.

* w/o Occupant Classification System

When the front passenger side seat belt is not fastened with the engine switch on (IG) and the front passenger side seat occupied, the front passenger side seat belt warning light on the clock assembly*1 or integration control and panel assembly*2 blinks. The occupant detection sensor detects if the front passenger side seat is occupied and sends signals to the combination meter assembly. The front seat inner belt assembly detects the front passenger side seat belt condition and sends signals to the combination meter assembly. After receiving the signals from the occupant detection sensor and front seat inner belt assembly, the combination meter illuminates the front passenger side seat belt warning light on the clock assembly*1 or integration control and panel assembly*2.

* *1: w/ Multi-display

* *2: w/o Multi-display

WIRING DIAGRAM

1. w/ Occupant Classification System





2. w/o Occupant Classification System





INSPECTION PROCEDURE

NOTICE:
The seat belt warning system use the CAN and Multiplex communication systems. First, confirm that there are no malfunction in the CAN and Multiplex communication systems. Refer to the How to Proceed with Troubleshooting procedure How To Proceed With Troubleshooting.

PROCEDURE

1. SYSTEM CHECK

(a) Check the vehicle specification.

Result:





B -- PERFORM ACTIVE TEST USING TECHSTREAM
A -- Continue to next step.

2. CHECK DTC (OCCUPANT CLASSIFICATION SYSTEM)

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Recheck for DTCs.

Result:





B -- GO TO OCCUPANT CLASSIFICATION SYSTEM Occupant Classification System
A -- Continue to next step.

3. CHECK DTC (AIRBAG SYSTEM)

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Recheck for DTCs.

Result:





B -- GO TO AIRBAG SYSTEM Airbag System
A -- Continue to next step.

4. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Combination Meter / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Combination Meter (Combination Meter Assembly)





OK:

The front passenger side seat belt warning light on the integration control and panel assembly*1 or clock assembly*2 operates normally.

*1: w/o Multi-display

*2: w/ Multi-display

NG -- SYSTEM CHECK

OK -- REPLACE COMBINATION METER ASSEMBLY Removal

5. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Combination Meter / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Combination Meter (Combination Meter Assembly)





OK:

The front passenger side seat belt warning light on the integration control and panel assembly*1 or clock assembly*2 operates normally.

*1: w/o Multi-display

*2: w/ Multi-display

NG -- SYSTEM CHECK
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT ASSEMBLY RH - COMBINATION METER)

(a) w/o Seat Memory

(1) Disconnect the J35 combination meter connector.





(2) Disconnect the T3 seat inner belt connector.

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

Standard Resistance:





Text in Illustration





(b) w/ Seat Memory

(1) Disconnect the J35 combination meter connector.





(2) Disconnect the T3 seat inner belt connector.

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

Standard Resistance:





(4) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

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

(a) Remove the occupant detection sensor (separate type front seat cushion pad) Removal.





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

Standard Resistance:





Text in Illustration





NG -- REPLACE SEPARATE TYPE FRONT SEAT CUSHION PAD (OCCUPANT DETECTION SENSOR) Removal
OK -- Continue to next step.

8. INSPECT FRONT SEAT INNER BELT ASSEMBLY RH

(a) Remove the front seat inner belt assembly RH Removal.





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

Standard Resistance:





Text in Illustration





NG -- REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Removal

OK -- REPLACE COMBINATION METER ASSEMBLY Removal

9. SYSTEM CHECK

(a) Check the vehicle specification.

Result





B -- CHECK HARNESS AND CONNECTOR (CLOCK ASSEMBLY - BATTERY)
A -- Continue to next step.

10. CHECK HARNESS AND CONNECTOR (INTEGRATION CONTROL AND PANEL ASSEMBLY - BATTERY)

(a) Disconnect the J54 integration control and panel connector.





(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

11. CHECK HARNESS AND CONNECTOR (INTEGRATION CONTROL AND PANEL ASSEMBLY - COMBINATION METER)

(a) Disconnect the J35 combination meter connector.





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

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

12. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BATTERY)

(a) Reconnect the J54 integration control and panel connector.





(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Text in Illustration





NG -- REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY Removal

OK -- REPLACE COMBINATION METER ASSEMBLY Removal

13. CHECK HARNESS AND CONNECTOR (CLOCK ASSEMBLY - BATTERY)

(a) Disconnect the J92 clock connector.





(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

14. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - CLOCK ASSEMBLY)

(a) Disconnect the J35 combination meter connector.





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

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

15. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BATTERY)

(a) Reconnect the J92 clock connector.





(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Text in Illustration





NG -- REPLACE CLOCK ASSEMBLY Removal

OK -- REPLACE COMBINATION METER ASSEMBLY Removal
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