Lexus RX Owners Manual (RX450h): If a warning light turns on or a warning buzzer sounds

Lexus RX Owners Manual (RX450h) / When trouble arises / Steps to take in an emergency / If a warning light turns on or a warning buzzer sounds

Calmly perform the following actions if any of the warning lights comes on or flashes. If a light comes on or flashes, but then goes off, this does not necessarily indicate a malfunction in the system. However, if this continues to occur, have the vehicle inspected by your Lexus dealer.

Warning light and warning buzzer list

Warning light

Warning light/Details/Actions

Brake system warning light

Indicates that:

  • The brake fluid level is low; or
  • The brake system is malfunctioning

→ Immediately stop the vehicle in a safe place and contact your Lexus dealer. Continuing to drive the vehicle may be dangerous.

Brake system warning light

Indicates a malfunction in:

  • The regenerative braking system;
  • The electronically controlled brake system; or
  • The electric parking brake

→ Have the vehicle inspected by your Lexus dealer immediately.

Charging system warning light

Indicates a malfunction in the vehicle's charging system

→ Immediately stop the vehicle in a safe place and contact your Lexus dealer. Continuing to drive the vehicle may be dangerous.

Malfunction indicator lamp

Indicates a malfunction in:

  • The hybrid system;
  • The electronic engine control system; or
  • The electronic throttle control system

→ Have the vehicle inspected by your Lexus dealer immediately.

SRS warning light

Indicates a malfunction in:

  • The SRS airbag system;
  • The front passenger occupant classification system; or
  • The seat belt pretensioner system

→ Have the vehicle inspected by your Lexus dealer immediately.

ABS warning light

Indicates a malfunction in:

  • The ABS; or
  • The brake assist system

→ Have the vehicle inspected by your Lexus dealer immediately.

Lexus RX. Steps to take in an emergency Parking brake indicator

It is possible that the parking brake is not fully engaged or released

→ Operate the parking brake switch once again.

This light comes on when the parking brake is not released. If the light turns off after the parking brake is fully released, the system is operating normally.

Lexus RX. Steps to take in an emergency Brake hold operated indicator

Indicates a malfunction in the brake hold system

→ Have the vehicle inspected by your Lexus dealer immediately.

Lexus RX. Steps to take in an emergency Electric power steering system warning light (warning buzzer)

Indicates a malfunction in the EPS (Electric Power Steering) system

→ Have the vehicle inspected by your Lexus dealer immediately.

Lexus RX. Steps to take in an emergency LKA indicator

Indicates a malfunction in the LKA (Lane-Keeping Assist)

→ When "Lane Keeping Assist Unavailable" is displayed on the multi-information display, turn the LKA system off, drive the vehicle for a short time, and then turn the LKA system back on.

When a message other than above is displayed, follow the instructions displayed in the message

Slip indicator

When the warning light is illuminated: Indicates a malfunction in:

  • The VSC system;
  • The TRAC system;
  • The Trailer Sway Control; or
  • The hill-start assist control system

→ Have the vehicle inspected by your Lexus dealer immediately.

When the warning light flashes: Indicates that the ABS, VSC, TRAC or Trailer Sway Control system is operating

Lexus RX. Steps to take in an emergency PCS warning light

Indicates a malfunction in the PCS (Pre-Collision System) or that the system is temporarily unavailable due to the vehicle being extremely hot/cold, or dirt around a front sensor, etc.

→ Follow the instructions displayed on the multi-information display.

If the PCS (Pre-Collision System) or VSC (Vehicle Stability Control) system is disabled, the PCS warning light will illuminate.

Lexus RX. Steps to take in an emergency ICS OFF indicator

When a buzzer sounds: Indicates a malfunction in the Intelligent Clearance Sonar system → Have the vehicle inspected by your Lexus dealer immediately.

When a buzzer does not sound: Indicates that the system is temporarily unavailable, possibly due to a sensor being dirty or covered with ice, etc.

→ Clear the dirt, etc.

Low fuel level warning light

Indicates that remaining fuel is approximately 2.9 gal. (11.0 L, 2.4 Imp. gal.) or less

→Refuel the vehicle.

Driver's and front passenger's seat belt reminder light (warning buzzer)*1

Warns the driver and/or front passenger to fasten their seat belts

→ Fasten the seat belt.

If the front passenger's seat is occupied, the front passenger's seat belt also needs to be fastened to make the warning light (warning buzzer) turn of

Lexus RX. Steps to take in an emergency Rear passengers' seat belt reminder light (warning buzzer)*2

Warns the rear passengers to fasten their seat belts

→ Fasten the seat belt.

Tire pressure warning light

Indicates the following:

  • Low tire pressure due to flat tire;
  • Low tire pressure due to natural causes; or
  • The tire pressure warning system is malfunctioning

→ Immediately stop the vehicle in a safe place.

Handling method

Master warning light

A buzzer sounds and the warning light comes on and flashes to indicate that the master warning system has detected a malfunction.

*1: Driver's and front passenger's seat belt warning buzzer: The driver's seat belt warning buzzer sounds to alert the driver that his or her seat belt is not fastened. Once the power switch is turned to ON mode, the buzzer sounds for 6 seconds. If the vehicle reaches a speed of 12 mph (20 km/h), the buzzer sounds once. If the seat belt is still unfastened after 24 seconds, the buzzer will sound intermittently for 10 seconds. Then, if the seat belt is still unfastened, the buzzer will sound in a different tone for 20 more seconds.

The front passenger's seat belt warning buzzer sounds to alert the front passenger that his or her seat belt is not fastened. The buzzer sounds once if the vehicle reaches a speed of 12 mph (20 km/h). If the seat belt is still unfastened after 24 seconds, the buzzer will sound intermittently for 10 seconds. Then, if the seat belt is still unfastened, the buzzer will sound in a different tone for 20 more seconds.

*2: Rear passengers' seat belt warning buzzer: The rear passengers' seat belt warning buzzer sounds to alert the rear passengers that his or her seat belt is not fastened. The buzzer sounds for 6 seconds after the vehicle reaches a speed of 20 km/h (12 mph). Then, if the seat belt is still unfastened, the buzzer will sound in a different tone for 24 more seconds.

■ SRS warning light This warning light system monitors the airbag sensor assembly, front impact sensors, side impact sensors (front door), side impact sensors (rear), driver's seat position sensor, driver's seat belt buckle switch, front passenger occupant classification system (ECU and sensors), "AIR BAG ON" indicator light, "AIR BAG OFF" indicator light, front passenger's seat belt buckle switch, driver's seat belt pretensioner, front passenger's seat belt pretensioner and force limiter, airbags, interconnecting wiring and power sources.

■ Front passenger detection sensor, seat belt reminder and warning buzzer

  • If luggage is placed on the front passenger seat, the front passenger detection sensor may cause the warning light to flash and the warning buzzer to sound even if a passenger is not sitting in the seat.
  • If a cushion is placed on the seat, the sensor may not detect a passenger, and the warning light may not operate properly.

■ Electric power steering system warning light (warning buzzer) When the 12-volt battery charge becomes insufficient or the voltage temporarily drops, the electric power steering system warning light may come on and the warning buzzer may sound.

■ If the malfunction indicator lamp comes on while driving First check the following:

  • Is the fuel tank empty? If it is, fill the fuel tank immediately.
  • Is the fuel tank cap loose? If it is, tighten it securely.

The light will go off after several driving trips.

If the light does not go off even after several trips, contact your Lexus dealer as soon as possible.

■ When the tire pressure warning light comes on

Inspect the tires to check if a tire is punctured.

If none of the tires are punctured: Turn the power switch off then turn it to ON mode. Check if the tire pressure warning light comes on or blinks.

If the tire pressure warning light comes on

1. After the temperature of the tires has lowered sufficiently, check the inflation pressure of each tire and adjust them to the specified level.

2. If the warning light does not turn off even after several minutes have elapsed, check that the inflation pressure of each tire is at the specified level and perform initialization.

If the warning light does not turn off several minutes after the initialization has been performed, have the vehicle inspected by your Lexus dealer immediately.

If the tire pressure warning light blinks for 1 minute then stays on

There may be a malfunction in the tire pressure warning system. Have the vehicle inspected by your Lexus dealer immediately.

■ The tire pressure warning light may come on due to natural causes The tire pressure warning light may come on due to natural causes such as natural air leaks and tire inflation pressure changes caused by temperature. In this case, adjusting the tire inflation pressure will turn off the warning light (after a few minutes).

■ When a tire is replaced with a spare tire The compact spare tire is not equipped with a tire pressure warning valve and transmitter.

If a tire goes flat, the tire pressure warning light will not turn off even though the flat tire has been replaced with the spare tire. Replace the spare tire with the repaired tire and adjust the tire inflation pressure. The tire pressure warning light will go off after a few minutes.

■ Warning buzzer In some cases, the buzzer may not be heard due to being in a noisy location or audio sound.

■ Customization Some functions can be customized.

WARNING

■ If both the ABS and the brake system warning lights remain on Stop your vehicle in a safe place immediately and contact your Lexus dealer. The vehicle will become extremely unstable during braking, and the ABS system may fail, which could cause an accident resulting in death or serious injury.

■ When the electric power steering system warning light comes on When the light comes on yellow, the assist to the power steering is restricted. When the light comes on red, the assist to the power steering is lost and handling operations of the steering wheel become extremely heavy. When steering wheel operations are heavier than usual, grip the steering wheel firmly and operate it using more force than usual.

■ If the tire pressure warning light comes on Be sure to observe the following precautions. Failure to do so could cause a loss of vehicle control and result in death or serious injury.

  • Stop your vehicle in a safe place as soon as possible. Adjust the tire inflation pressure immediately.
  • If the tire pressure warning light comes on even after tire inflation pressure adjustment, it is probable that you have a flat tire. Check the tires. If a tire is flat, change it with the spare tire and have the flat tire repaired by the nearest Lexus dealer.
  • Avoid abrupt maneuvering and braking. If the vehicle tires deteriorate, you could lose control of the steering wheel or the brakes.

■ If a blowout or sudden air leakage should occur The tire pressure warning system may not activate immediately.

WARNING

■Maintenance of the tires Each tire, including the spare (if provided), should be checked monthly when cold and inflated to the inflation pressure recommended by the vehicle manufacturer on the vehicle placard or tire inflation pressure label (tire and load information label). (If your vehicle has tires of a different size than the size indicated on the vehicle placard or tire inflation pressure label [tire and load information label], you should determine the proper tire inflation pressure for those tires.) As an added safety feature, your vehicle has been equipped with a tire pressure monitoring system (TPMS-tire pressure warning system) that illuminates a low tire pressure telltale (tire pressure warning light) when one or more of your tires is significantly under-inflated. Accordingly, when the low tire pressure telltale (tire pressure warning light) illuminates, you should stop and check your tires as soon as possible, and inflate them to the proper pressure. Driving on a significantly under-inflated tire causes the tire to overheat and can lead to tire failure. Under-inflation also reduces fuel efficiency and tire tread life, and may affect the vehicle's handling and stopping ability.

Please note that the TPMS (tire pressure warning system) is not a substitute for proper tire maintenance, and it is the driver's responsibility to maintain correct tire pressure, even if under-inflation has not reached the level to trigger illumination of the TPMS low tire pressure telltale (tire pressure warning light).

Your vehicle has also been equipped with a TPMS (tire pressure warning system) malfunction indicator to indicate when the system is not operating properly. The TPMS (tire pressure warning system) malfunction indicator is combined with the low tire pressure telltale (tire pressure warning light). When the system detects a malfunction, the telltale will flash for approximately one minute and then remain continuously illuminated.

This sequence will continue upon subsequent vehicle start-ups as long as the malfunction exists. When the malfunction indicator is illuminated, the system may not be able to detect or signal low tire pressure as intended.

TPMS (tire pressure warning system) malfunctions may occur for a variety of reasons, including the installation of replacement or alternate tires or wheels on the vehicle that prevent the TPMS (tire pressure warning system) from functioning properly. Always check the TPMS (tire pressure warning system) malfunction telltale after replacing one or more tires or wheels on your vehicle to ensure that the replacement or alternate tires and wheels allow the TPMS (tire pressure warning system) to continue to function properly.

NOTICE

■ To ensure the tire pressure warning system operates properly Do not install tires with different specifications or makers, as the tire pressure warning system may not operate properly.

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