Lexus ES manuals

Lexus ES: System Description

Lexus ES (XZ10) Service Manual / Vehicle Interior / Wiper / Washer / Wiper And Washer System (for Hv Model) / System Description

SYSTEM DESCRIPTION

FRONT WIPER AND WASHER CONTROL FUNCTION

Control/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*2

Stops the front wipers when the windshield 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 front wipers stop at their lowermost position for 0.3 seconds, and then move to the park position.
  • AUTO control resumes 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 approximately 45 seconds of turning the power switch off.

HINT:

  • The front wipers can be returned from the service position by turning the power 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*1 the wipers.

Engine hood interference damage reduction function
  • Operates the windshield wiper motor assembly 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 power switch is on (IG).

Protection mode
  • Limits the operation of the windshield wiper motor assembly when excessive load is detected, in order to protect the wiper and washer system.
  • Refer to Fail-safe chart.

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MIST function

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

Auto operation*2

Operates the wipers as requested by the rain sensor when the windshield wiper switch assembly is in 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 AUTO*2 or INT*3 position.

HINT:

  • The period of delay is controlled by the auto sensitivity adjustment switch*2 or intermittent time adjustment switch*3 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 AUTO*2 or INT*3 position and the vehicle is stopped, the wipers operate for 1 cycle when the vehicle starts off.
  • When the auto sensitivity adjustment switch*2 or intermittent time adjustment switch*3 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 approximately 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

Approximately 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 will stop operating at a vehicle speed of approximately 5 km/h (3 mph) 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 approximately 2.5 seconds intervals.
  • *1: Function that allows the wiper arms to be folded back such as when servicing the wiper rubber.
  • *2: w/ Auto Wiper System
  • *3: w/o Auto Wiper System

OTHER FUNCTIONS

Control/Function

Description

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.

Wiper system warning

Displays "Wiper System Malfunction Visit Your Dealer" on the multi-information display in the combination meter assembly when the wiper system is malfunctioning.

READ NEXT:

 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

 Check For Intermittent Problems

CHECK FOR INTERMITTENT PROBLEMS NOTICE: If the vehicle or vehicle controls are operated (for example, during initial inspection when the vehicle is brought in for repair) before operation history h

 Operation Check

OPERATION CHECK CHECK DOOR OPEN LINKED WIPER SUSPEND FUNCTION (w/ Auto Wiper System) (a) Continuously apply water to the windshield glass in front of the rain sensor. (b) Turn the power switch on (IG)

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 ECU Malfunction (C1614)

DESCRIPTION This DTC is stored if the parking assist ECU judges that there is an internal malfunction as a result of its self check. HINT: The parking assist ECU stores different types of information during initialization. If the parking assist ECU cannot read the stored information when activated,

 Inspection

INSPECTION PROCEDURE 1. INSPECT FRONT DRIVE SHAFT ASSEMBLY (a) Check that there is no excessive play in the radial direction of the outboard joint. (b) Check that the inboard joint slides smoothly in the thrust direction. (c) Check that there is no excessive play in the radial directi

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