Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Precaution

PRECAUTION

PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL

NOTICE:

When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected.

PRECAUTIONS FOR BLIND SPOT MONITOR SYSTEM

(a) The blind spot monitor function may not detect vehicles correctly in the following conditions:

(1) When the sensor is misaligned due to a strong impact to the sensor or its surrounding area.

(2) When mud, snow, ice, a sticker, etc. is covering the sensor or its surrounding area on the rear bumper.

(3) When driving on a road surface that is wet with standing water during bad weather such as heavy rain, snow, or fog.

(4) When multiple vehicles are approaching with only a small gap between each vehicle.

(5) When the distance between this vehicle and a following vehicle is short.

(6) When there is a significant difference in speed between this vehicle and the vehicle that enters the detection area.

(7) When the difference in speed between this vehicle and another vehicle is changing.

(8) When a vehicle enters a detection area traveling at about the same speed as this vehicle.

(9) As your vehicle starts from a stop, a vehicle remains in the detection area.

(10) When driving up and down consecutive steep inclines, such as hills, dips in the road, etc.

(11) When driving on roads with sharp bends, consecutive curves, or uneven surfaces.

(12) When vehicle lanes are wide, or when driving on the edge of a lane, and the vehicle in an adjacent lane is far away from this vehicle.

(13) When towing a trailer.

(14) When a bicycle carrier or other accessory is installed to the rear of the vehicle.

(15) When there is a significant difference in height between this vehicle and the vehicle that enters the detection area.

(16) Immediately after the blind spot monitor system is turned on.

HINT:

In this section, the expression "this vehicle" is used to refer to the vehicle equipped with this blind spot monitor system.

(b) The blind spot monitor function is not designed to detect the following types of vehicles or objects:

(1) Vehicles traveling from the opposite direction.

(2) Small motorcycles, bicycles, pedestrians, etc.*

(3) Following vehicles that are in the same lane.*

(4) Guardrails, walls, signs, parked vehicles and similar stationary objects.*

(5) Vehicles driving 2 lanes across from this vehicle.

(c) Instances of the blind spot monitor function unnecessarily detecting a vehicle and/or object may increase under the following conditions:

(1) When the sensor is misaligned due to a strong impact to the sensor or its surrounding area.

(2) When a distance between this vehicle and a guardrail, wall, etc. that enters the detection area is short.

(3) When driving up and down consecutive steep inclines, such as hills, dips in the road, etc.

(4) When vehicle lanes are narrow, or when driving on the edge of a lane, and a vehicle traveling in a lane other than the adjacent lanes enters the detection area.

(5) When driving on roads with sharp bends, consecutive curves, or uneven surfaces.

(6) When the tires are slipping or spinning.

(7) When the distance between this vehicle and a following vehicle is short.

(8) When a bicycle carrier or other accessory is installed to the rear of the vehicle.

(9) When towing a trailer.

(d) The RCTA function may not detect vehicles correctly in the following conditions:

(1) During bad weather such as heavy rain, fog, snow, etc.

(2) When the sensor is misaligned due to a strong impact to the sensor or its surrounding area.

(3) When driving on a road surface that is wet with standing water during bad weather such as heavy rain, snow, or fog.

(4) When multiple vehicles are approaching with only a small gap between each vehicle.

(5) When a vehicle is approaching at high speed.

(6) When towing a trailer.

(7) When backing up on a slope with a sharp change in grade.

(8) When backing out of a shallow angle parking spot.

(9) Immediately after the blind spot monitor system is turned on.

(10) Immediately after the engine is started with the blind spot monitor system on.

(11) When the sensors cannot detect a vehicle due to obstructions.

(e) The RCTA function is not designed to detect the following types of vehicles or objects:

(1) Vehicles approaching from directly behind.

(2) Vehicles that the sensors cannot detect due to obstructions.

(3) Guardrails, walls, signs, parked vehicles and similar stationary objects.*

(4) Small motorcycles, bicycles, pedestrians, etc.*

(5) Vehicles moving away from this vehicle.

(6) Vehicles approaching from the parking spaces next to this vehicle.*

HINT:

In this section, the expression "this vehicle" is used to refer to the vehicle equipped with this blind spot monitor system.

(f) Instances of the RCTA function unnecessarily detecting a vehicle and/or object may increase under the following condition:

(1) When a vehicle passes by the side of this vehicle.

(2) When the parking space faces a street and vehicles are being driven on the street.

(3) When the distance between this vehicle and metal objects, such as a guardrail, wall, sign, or parked vehicle, which may reflect electrical waves toward the rear of the vehicle, is short

HINT:

In this section, the expression "this vehicle" is used to refer to the vehicle equipped with this blind spot monitor system.

(g) Under the following conditions, the blind spot monitor system may store DTCs C1AC1 and C1AC2 by mistake:

(1) The vehicle is driven continuously with the blind spot monitor system on when using a drum tester such as a speedometer tester, brake/ speedometer combination tester or chassis dynamometer.

(2) When mud, snow, ice, a sticker, etc. is covering the sensor or surrounding area on the rear bumper.

HANDLING THE RADAR SENSOR

(a) Blind spot monitor sensors are installed behind the left and right sides of the rear bumper respectively. Observe the following to ensure the blind spot monitor can function correctly.

(1) Keep the sensors and the surrounding areas on the rear bumper clean at all times.

(2) Do not subject a sensor or its surrounding area on the rear bumper to a strong impact. If a sensor is moved even slightly off position, the system may malfunction and vehicles may not be detected correctly. In the following situations, inspect the sensor and surrounding area.

(3) Do not disassemble the sensor.

(4) Do not attach stickers to the sensor or surrounding area on the rear bumper.

(5) Do not modify the sensor or surrounding area on the rear bumper.

(6) Do not paint the rear bumper any color other than an official Lexus color.

(7) Do not drop a sensor or subject it to a strong impact, as it is a high-precision device.

(8) Do not reuse a sensor that has been dropped or subjected to a strong impact.

SENSOR EXPRESSIONS

(a) The descriptions for the blind spot monitor sensors differ depending on the system. The expressions listed in the table below are used in this Repair Manual.