Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: System Description
SYSTEM DESCRIPTION
SEAT BELT WARNING SYSTEM DESCRIPTION
(a) Seat belt warning light operation for driver 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) Seat belt warning light operation for front passenger 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) Seat belt warning light operation for rear seat belt (w/ Rear Seat Belt Warning):
The rear seat belt warning light on the radio receiver assembly illuminates, blinks or turns off in accordance with the rear door state, rear seat belt state, vehicle speed, shift lever position and parking brake state.
(d) Seat belt warning buzzer operation for front seat belt:
After turning the engine switch on (IG), if the driver seat belt is not fastened within 1.8 seconds, the seat belt warning buzzer in the combination meter assembly will sound at an interval of 1.2 seconds for 6 seconds.
When the vehicle is driven at approximately 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 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 90 seconds.
(e) Seat belt warning buzzer operation for rear seat belt (w/ Rear Seat Belt Warning):
When the vehicle is driven at approximately 20 km/h (12 mph) or more with a rear 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 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 30 seconds.
FUNCTION OF MAIN COMPONENTS
| Component | Function |
|---|---|
| Front seat inner belt assembly LH | Informs the airbag sensor assembly of the driver seat belt condition (fastened or unfastened). |
| Front seat inner belt assembly RH | Informs the occupant detection ECU of the front passenger seat belt condition (fastened or unfastened). |
| Informs the occupant detection ECU of the front passenger seat condition (occupied or unoccupied). |
| Combination meter assembly |
|
| Occupant detection ECU | Sends the front passenger seat belt buckle switch signal and occupant detection signal to the airbag sensor assembly via CAN communication. |
| Airbag sensor assembly | Sends the front passenger seat belt buckle switch signal and occupant detection signal to the combination meter assembly via CAN communication. |
| Informs the combination meter assembly of each rear seat belt condition (fastened or unfastened). |
| Rear door courtesy light switch assembly (LH/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) | Sends the rear door courtesy switch signal to the combination meter assembly via CAN communication. |
| Skid control ECU (Brake actuator assembly) | Sends the vehicle speed signal to the combination meter assembly via CAN communication. |
| ECM | Sends the shift position signal to the combination meter assembly via CAN communication. |
-
*1: for 60/40 Split Seat Type
*2: w/ Rear No. 2 Seat
Parts Location
PARTS LOCATION ILLUSTRATION *1 AIRBAG SENSOR ASSEMBLY *2 ECM *3 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) *4 DLC3 *5 MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) *6 INSTRU ...
Customize Parameters
CUSTOMIZE PARAMETERS CUSTOMIZE SEAT BELT WARNING SYSTEM NOTICE:
When the customer requests a change in a function, first make sure that the function can be customized.
Be sure to make a note of t ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Sfi System: Diagnosis System
DIAGNOSIS SYSTEM DESCRIPTION When troubleshooting OBD II (On-Board Diagnostics) vehicles, the Techstream (complying with SAE J1978) must be connected to the DLC3 (Data Link Connector 3) of the vehicle. Various data in the vehicle's ECM (Engine Control Module) can be then read. OBD II regulations re ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Fuel System: Precaution
PRECAUTION CAUTION:
The fuel tank assembly is very heavy. Be sure to follow the procedure described in the repair manual, or the fuel tank assembly may fall off the engine lifter.
To prevent serious injury due to fuel spray from the high-pressure fuel lines, always discharge fuel system pressu ...
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
- Pictorial index
- For safety and security
- Instrument cluster
- Operation of each component
- Driving
- Lexus Display Audio system
- Interior features
- Maintenance and care
- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
0.0148