- Sends the driver side seat belt buckle switch signal to the main body ECU (multiplex network body ECU) via CAN communication.
- Sends the front passenger side seat belt buckle switch and occupant detection signals to the combination meter assembly via CAN communication.
Lexus NX: System Description
Lexus NX Service Manual / Vehicle Interior / Seat Belt / Seat Belt Warning System / System Description
SYSTEM DESCRIPTION
SEAT BELT WARNING SYSTEM DESCRIPTION
HINT:
The front seat belt warning light on the combination meter assembly is used for both the driver side seat and front passenger side seat.
(a) Front seat belt warning light operation for driver side seat belt:
The seat belt warning light on the combination meter assembly illuminates, blinks or turns off in accordance with the driver seat belt state, vehicle speed, shift lever position and parking brake state.
(b) Front seat belt warning light operation for front passenger side seat belt:
The seat belt warning light on the combination meter assembly illuminates, blinks or turns off in accordance with whether the front passenger seat is occupied, the front passenger seat belt state, vehicle speed, shift lever position and parking brake state.
(c) Rear seat belt warning light:
The rear seat belt warning lights on the radio receiver assembly illuminate or turn off in accordance with the rear door state, vehicle speed and rear seat belt state.
(d) Seat belt warning buzzer:
After turning the engine switch on (IG), if the driver seat belt is not fastened within 1.8 seconds, check that the seat belt warning buzzer in the combination meter assembly sounds at 1.2 second intervals for 6 seconds.
When the vehicle is driven at 20 km/h (12 mph) or more with the front passenger seat occupied and the driver or front passenger seat belt not fastened, the seat belt warning buzzer in the combination meter assembly sounds once.
When 24 seconds have passed after the buzzer sounded, the seat belt warning buzzer in the combination meter assembly sounds at an interval of 1.2 second for 9.6 seconds.
After that, the seat belt warning buzzer in the combination meter assembly sounds at an interval of 0.4 seconds for 20 seconds.
(e) Rear seat belt warning buzzer:
When the vehicle is driven at 20 km/h (12 mph) or more with a rear seat belt not fastened, the seat belt warning buzzer in the combination meter assembly will sound at an interval of 1.2 seconds for 6 seconds.
After that, the seat belt warning buzzer in the combination meter assembly will sound at an interval of 0.4 seconds for 24 seconds.
FUNCTION OF MAIN COMPONENT
The following functions are available.| Components | Function |
|---|---|
| Front seat inner belt assembly LH | Informs airbag ECU assembly of driver side seat belt condition (fastened or unfastened). |
| Front seat inner belt assembly RH | Informs occupant detection ECU of front passenger side seat belt condition (fastened or unfastened). |
| Occupant detection ECU | Sends the front passenger side seat belt buckle switch signal and occupant detection signal to the airbag ECU assembly. |
| Front occupant classification sensor LH Rear occupant classification sensor LH | Informs the occupant detection ECU of the front passenger seat condition (occupied or unoccupied). |
| Airbag ECU assembly | |
| Rear center seat inner belt assembly Rear seat inner belt assembly LH Rear seat 3 point type belt assembly RH | Informs the combination meter assembly of each rear seat belt condition (fastened or unfastened). |
| Rear door courtesy light switch assembly LH Rear door courtesy light switch assembly RH | Informs the main body ECU (multiplex network body ECU) of the rear door condition (open or closed). |
| Main body ECU (multiplex network body ECU) |
|
| Brake booster with master cylinder assembly (skid control ECU) | Sends the vehicle speed signal to the combination meter assembly via CAN communication. |
| Hybrid vehicle control ECU | Sends the shift position signal to the combination meter assembly via CAN communication. |
| Parking brake ECU assembly | Sends the parking brake switch signal to the combination meter assembly via CAN communication. |
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How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use this procedure to troubleshoot the seat belt warning system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
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Operation Check
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