Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: System Description

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Exterior / Wiper / Washer / Wiper And Washer System / System Description

SYSTEM DESCRIPTION

FRONT WIPER AND WASHER CONTROL FUNCTION

Control/Function

Function Description

Wiper speed regulation

Maintains the default speed of the wipers even when the supply voltage or resistance changes.

Door Open Linked Wiper Suspend Function (w/ Rain Sensor)

Stops the front wipers when the wiper switch assembly is in the AUTO position, the shift lever is in P and the driver door or front passenger door is open.

HINT:

  • The wipers stop at their lowermost position for 0.3 seconds, and then move to the park position.
  • AUTO control is reinstated when the door is closed.

Wiper speed HI to LO transition control

Smoothly controls the change in speed of the wipers when the wiper speed is switched from HI to LO.

Service position control

Stops the wipers at the top of their stroke when the windshield wiper switch assembly is held in the MIST position for 2 seconds or more within 42 seconds of turning the engine switch off.

HINT:

  • he front wipers can be returned from the service position by turning the engine switch on (IG) and operating the front wipers with the wiper switch assembly in any position.
  • When MIST is operated when the wipers are in the service position, the wipers return to the park position.
  • The wipers must be in the service position when locking back* the wipers.
  • When the front wipers are returned from the service position, the wipers operate at a slow speed for the first cycle to minimize damage to the engine hood if there is contact with a wiper arm in the lock-back position. Also, if a wiper arm contacts the engine hood, the wipers are stopped after being moved a short distance in reverse.

Engine hood interference damage reduction function
  • Operates the windshield wiper motor at a slow speed for the first cycle when returning from the service position to minimize damage if there is contact with a wiper arm in the lock-back position.
  • Moves the wipers a short distance in reverse if a wiper arm in the lock-back position contacts the engine hood and the windshield wiper motor locks up.

Self locking control

Holds the wipers in the park position when the engine switch is on (IG).

Maintenance position control

Stops the wipers at the half way point when the windshield wiper switch assembly is moved to the MIST position 6 times in 2 seconds within 42 seconds of turning the engine switch off.

HINT:

The maintenance position is used when performing work on the front suspension.

Protection mode

Monitors the current, speed and temperature of the front wiper motor in order to protect the system.

HINT:

  • Overload protection which operates such as when the front windshield is dry, reduces the speed of the wipers and sets the wipers to INT mode in order to reduce wear.
  • Snow protection operates when accumulated snow at the extremities of the wiper movement interferes with operation. In this situation, the wipers temporarily stop and repeatedly push the snow. If the snow cannot be cleared, the wipers reverse direction and then continue.
  • Excessive load protection operates when an excessive load is detected when the wipers are near the center of the wiper movement. In this situation, the wipers stop.

MIST function

Operates the wipers in the LO setting when the windshield wiper switch assembly is held in the MIST position.

Auto operation

Operates the wipers as requested by the rain sensor when the windshield wiper switch assembly is set to the AUTO position.

Vehicle speed linked wiper intermittent operation control

Controls the delay of the wipers when the windshield wiper switch assembly is set to the INT position.

HINT:

  • The period of delay is controlled by the auto sensitivity adjustment switch on the windshield wiper switch assembly.
  • The period of delay changes in accordance with vehicle speed.
  • When the windshield wiper switch assembly is set to the INT position and the vehicle is stopped, the wipers operate for 1 cycle when the vehicle starts off.
  • When the auto sensitivity adjustment switch on the windshield wiper switch assembly is moved to a faster position, the delay is reset and control begins according to the new setting.

Washer cooperation
  • When the washer switch is operated for 0.5 seconds or more, the front wipers operate in the LO setting.
  • When the washer switch is released, the front wipers operate in the LO setting for 3 cycles.

NOTICE:

If the washer switch is operated for 40 seconds or more, operation of the washers is stopped to prevent burnout of the windshield washer motor, and the wipers return to the parked position.

Drip prevention wiper function

3 seconds after washer cooperation completes, operates the wipers for 1 cycle to remove any washer fluid that has dripped out.

HINT:

This function only operates when the vehicle is stationary and does not operate at a vehicle speed of 4 km/h or more.

Vehicle stopped wiper control

If the vehicle is stopped and the windshield wiper switch assembly is switched to the LO setting, the wipers operate for 3 cycles and automatically enters intermittent operation with 2.5-second intervals.
  • *: Function that allows the wiper arms to be folded back such as when servicing the wiper rubber

REAR WIPER AND WASHER CONTROL FUNCTION

Control/Function

Function Description

Intermittent wiper operation control

Operates the rear wiper once every 12 seconds when the rear wiper switch is turned to the INT position.

Washer cooperation
  • When the rear washer switch is operated for 0.5 seconds or more, the rear wiper operates.
  • When the washer switch is released, the front wipers operate in the LO setting for 3 cycles.

NOTICE:

If the washer switch is operated for 40 seconds or more, operation of the washers is stopped to prevent burnout of the windshield washer motor, and the wipers return to the parked position.

OTHER FUNCTIONS

Control/Function

Function Description

Headlight cleaner control (w/ Headlight cleaner system)

Headlight washer control operates the headlight cleaner motor and pump assembly for 1 second to spray washer fluid from the headlight wiper actuator on the 5th time the washer switch is operated.

Washer fluid level low warning

Displays "Windshield Washer Fluid Low" on the multi-information display in the combination meter assembly when the washer fluid level is low.
    System Diagram
    SYSTEM DIAGRAM FRONT WIPER AND WASHER SYSTEM (w/o Auto Wiper System) FRONT WIPER AND WASHER SYSTEM (w/ Auto Wiper System) REAR WIPER AND WASHER SYSTEM HEADLIGHT CLEANER SYSTEM (w/ Headlight Cleaner ...

    How To Proceed With Troubleshooting
    CAUTION / NOTICE / HINT HINT: Use the following procedure to troubleshoot the wiper and washer system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT ...

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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