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

PRECAUTION

CAUTION REGARDING INTERFERENCE WITH ELECTRONIC DEVICES

PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL

PRECAUTION WHEN USING TECHSTREAM

(a) When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Access. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.

PRECAUTION WHEN REPLACING PARTS

(a) If replacing any of the following parts, refer to the Registration.

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(1) Certification ECU (smart key ECU assembly)

(2) Steering lock ECU (steering lock actuator or upper bracket assembly)

(3) ID code box (immobiliser code ECU)

(4) Main body ECU (multiplex network body ECU)

(5) Electrical key transmitter sub-assembly

(6) ECM

(b) If the door control receiver is replaced, it is necessary to register the electrical key transmitter sub-assemblies to the new door control receiver and perform registaration and initialization .

PRECAUTIONS FOR BATTERY AND TRANSMITTER BATTERY BUILT INTO ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

(a) When the doors are locked, power from the battery is used to transmit radio waves. The battery may become discharged if the vehicle remains parked for a long time. If the vehicle is not to be used for a long time, disconnect the cable from the negative (-) battery terminal, set transmitter battery saving mode or cancel the smart access system with push-button start (for Entry Function).

(b) When the doors are locked and an electrical key transmitter sub-assembly is in the detection area of an electrical key antenna, the transmitter battery may be depleted due to periodic communication between the electrical key transmitter sub-assembly and the vehicle. If the vehicle is not to be used for a long time, keep the key away from the vehicle (more than 2 m (6.56 ft.)).

PRECAUTIONS FOR ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

(a) The electrical key transmitter sub-assembly is a precision instrument. Be sure to observe the following:

(1) Do not subject the electrical key transmitter sub-assembly to strong physical shocks.

(2) Do not keep the electrical key transmitter sub-assembly in a high temperature area for a long time.

(3) Do not use an ultrasonic washing machine to clean the electrical key transmitter sub-assembly.

(4) Do not use the electrical key transmitter sub-assembly near any magnets or magnetized items.

(5) Do not place the electrical key transmitter sub-assembly near magnetic equipment, such as digital audio players, induction cookers, medical devices that generate low-frequency electromagnetic waves, etc.

(6) Do not attach any stickers to the electrical key transmitter sub-assembly.

(7) Do not disassemble the electrical key transmitter sub-assemblies.

(8) The mechanical key should only be used in an emergency, such as when the transmitter battery is depleted.

PRECAUTIONS WHEN INSPECTING SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function)

(a) General precaution for the smart access system with push-button start (for Entry Function):

(1) Always carry the electrical key transmitter sub-assembly.

(b) The smart access system with push-button start (for Entry Function) may not operate normally or the key detection area may decrease in the following situations:

(1) The transmitter battery is depleted.

(2) There are TV towers, electric power plants, broadcasting stations, gas stations or other facilities that generate strong radio waves or electrical noise nearby.

(3) Wireless communication devices, such as walkie-talkies, cell phones, cordless telephones, digital audio players, portable game systems, etc., are carried together with the electrical key transmitter sub-assembly.

(4) The electrical key transmitter sub-assembly is covered by or in contact with objects made of metal, such as coins, certain types of cards, etc.

(5) Metallic film is applied to the rear window glass.

(6) A radio wave type keyless entry system or wireless remote is operated nearby.

(7) An electrical key transmitter sub-assembly from another vehicle is nearby.

(8) The electrical key transmitter sub-assembly is placed near equipment that generates high-voltage or electrical noise.

(9) The electrical key transmitter sub-assembly is placed near an electronic device such as a battery charger.

(c) Operating range of the smart access system with push-button start (for Entry Function):

(1) Due to the design of the vehicle body, there are some areas in which proper system operation is difficult.

(2) Even if the electrical key transmitter sub-assembly is in the vehicle exterior detection area, the electrical key transmitter sub-assembly may not be properly detected if the electrical key transmitter sub-assembly is near a window, a door handle or the center of the bumper.

(3) Even if an electrical key transmitter sub-assembly is in a vehicle interior detection area, the electrical key transmitter sub-assembly may not be properly detected if it is on the instrument panel, in the glove box or on the floor.

(4) Depending on the way the electrical key transmitter sub-assembly is held, the electrical key transmitter sub-assembly may not operate properly.

(d) As weak radio waves are emitted from the electrical key transmitter sub-assembly, if a pacemaker is being used, be sure to read the pacemaker instruction manual.

(e) The smart access system with push-button start (for Entry Function) will not operate under the following conditions:

(1) The procedure to cancel the smart access system with push-button start (for Entry Function) has been performed.

(2) There is no transmitter battery or the transmitter battery is depleted (the LED of the electrical key transmitter sub-assembly does not blink when an electrical key transmitter sub-assembly switch is pressed).

PRECAUTIONS FOR ENTRY UNLOCK FUNCTION

(a) When unlocking the doors, make sure to grasp the door outside handle assembly, ensuring contact with the sensor on the inner part of the handle. Pull the handle after confirming that the door has unlocked.

(b) If the door outside handle assembly is grasped with gloved hands, unlocking may be delayed or may not occur.

(c) When performing an entry unlock operation, make sure to check that the doors are unlocked before pulling a door outside handle assembly to open a door.

(d) When attempting to open a door suddenly or immediately after entering a vehicle exterior detection area, the door may not unlock. In this case the system automatically performs the door unlock operation 4 times. However, if a door outside handle assembly is being pulled at this time, the door may not unlock due to mechanical reasons. If the door is not unlocked, return the door outside handle to its original position and pull the handle after confirming that the door has unlocked.

(e) If the electrical key transmitter sub-assembly is brought too close to the door outside handle assembly, it may not be possible to unlock the door with the entry unlock function.

(f) If an electrical key transmitter sub-assembly is within a vehicle exterior detection area, the door can be unlocked even when a person other than the person carrying the electrical key transmitter sub-assembly grasps the door outside handle assembly. However, doors other than the door for which the matching code is detected cannot be unlocked (if the electrical key transmitter sub-assembly is in the vehicle exterior detection area of the driver side door and the front door outside handle assembly (for driver door) is held, the doors can be unlocked. However, if the front door outside handle assembly (for front passenger door) is held, the doors cannot be unlocked).

(g) After a wireless door lock, manual door lock or key-linked door lock operation is performed with the electrical key transmitter sub-assembly in an interior detection area or near the vehicle, an entry unlock operation cannot be performed. Therefore, when a wireless door lock operation is performed near a window or door handle, the entry unlock may not be able to be operated. To unlock the doors, perform a wireless door unlock operation.

(h) If a door is not opened after a door unlock operation, the doors automatically lock after approximately 30 seconds*.

(i) If an electrical key transmitter sub-assembly is within a vehicle exterior detection area and a large amount of water is applied to a door outside handle assembly, such as by a car wash or heavy rain, the sensor may react and the entry unlock operation may be performed. However, the doors will automatically lock after approximately 30 seconds if a door is not opened*.

HINT:

*: When the auto lock function operates after an entry unlock operation, if an electrical key transmitter sub-assembly is detected in the cabin, the doors will be unlocked by the door ajar warning function.

(j) If the electrical key transmitter sub-assembly is being carried together with an electrical key transmitter sub-assembly from another vehicle with a smart access system with push-button start and the door outside handle assembly is held, the time before the door is unlocked by the entry unlock operation may be more than normal.

(k) After a door is unlocked with a mechanical key, an entry unlock operation cannot be performed using the open switch of the back door opener switch assembly or door outside handle assembly. To unlock, perform a wireless operation or operate the door control switch.

HINT:

By performing another lock operation or engine start operation, an entry unlock operation will be possible again.

PRECAUTIONS FOR ENTRY LOCK FUNCTION

(a) When performing an entry lock operation, if the lock sensor on the door outside handle assembly is touched too quickly, the door may not lock.

(b) If the electrical key transmitter sub-assembly is brought near the vehicle interior (window, door outside handle assembly), the entry lock function may not operate. Also, the key reminder warning buzzer may sound and the entry unlock function may stop operating. In this case, move the electrical key transmitter sub-assembly away from the vehicle interior (window, door outside handle assembly), perform an entry lock operation, and then perform an entry unlock operation.

(c) If the electrical key transmitter sub-assembly is being carried and a lock operation is performed from the driver door while the driver door is open (the door is ajar), the door ajar warning* does not operate.

(d) If the electrical key transmitter sub-assembly is left on the instrument panel, in the glove box or on the floor, the key reminder warning function may not operate and the electrical key transmitter sub-assembly may be locked in the vehicle when a door lock operation is performed. Always carry the electrical key transmitter sub-assembly.

(e) The entry unlock operation cannot be performed for approximately 3 seconds after an operation that locks the doors, such as an entry lock or wireless door lock operation, is performed.

(f) When checking the operation of the entry lock function several times, it can only be operated up to 2 times consecutively depending on the setting. To perform the operation 3 times or more consecutively, the doors need to be unlocked once (any unlock operation is acceptable). However, this is only for the entry lock function, other door lock functions, such as the wireless door lock function, can be operated consecutively.