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Home >> Lexus Truck >> 2012 >> RX 350 AWD V6-3.5L (2GR-FE) >> 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 accessory meter assembly*1 or radio receiver 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 radio receiver assembly 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 radio receiver assembly.

* *1: w/ Navigation System

* *2: w/o Navigation System

WIRING DIAGRAM

1. w/ Occupant Classification System









2. w/o Occupant Classification System





INSPECTION PROCEDURE

NOTICE:
The seat belt warning system uses the CAN communication system. First, confirm that there is no malfunction in the CAN communication system. 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 -- READ VALUE USING TECHSTREAM
A -- Continue to next step.

2. CHECK DTC OUTPUT (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 OUTPUT (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 accessory meter assembly*1 or radio receiver assembly*2 operates normally.

*1: w/o Navigation System

*2: w/ Navigation System

NG -- SYSTEM CHECK

OK -- REPLACE COMBINATION METER ASSEMBLY Removal

5. READ VALUE 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) Read the Data List according to the display on the Techstream.

Combination Meter (Combination Meter Assembly)





OK:

ON of OFF appears on the Techstream screen according to the front passenger side seat belt condition.

NG -- CHECK HARNESS AND CONNECTOR (FRONT PASSENGER SIDE SEAT INNER BELT - COMBINATION METER)
OK -- Continue to next step.

6. 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 radio receiver assembly operates normally.

NG -- SYSTEM CHECK

OK -- REPLACE COMBINATION METER ASSEMBLY Removal

7. CHECK HARNESS AND CONNECTOR (FRONT PASSENGER SIDE SEAT INNER BELT - COMBINATION METER)

(a) Disconnect the F15 meter connector.





(b) Disconnect the Z7 belt connector.

(c) 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.

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

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

9. 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

10. SYSTEM CHECK

(a) Check the vehicle specification.

Result:





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

11. CHECK HARNESS AND CONNECTOR (ACCESSORY METER ASSEMBLY - BATTERY)

(a) Disconnect the G1 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.

12. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ACCESSORY METER)

(a) Disconnect the F16 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.

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

(a) Reconnect the G1 connector.





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

Standard Voltage:





Text in Illustration





NG -- REPLACE ACCESSORY METER ASSEMBLY Removal

OK -- REPLACE COMBINATION METER ASSEMBLY Removal

14. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - BATTERY)

(a) Disconnect the G8 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.

15. CHECK HARNESS AND CONNECTOR (COMBINATION METER - RADIO RECEIVER)

(a) Disconnect the F16 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.

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

(a) Reconnect the G8 connector.





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

Standard Voltage:





Text in Illustration





NG -- REPLACE RADIO RECEIVER ASSEMBLY Removal

OK -- REPLACE COMBINATION METER ASSEMBLY Removal
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