Lexus IS250 IS220d GSE20 ALE20 - WIPER AND WASHER
WIPER AND WASHER SYSTEM - SYSTEM DESCRIPTION
| WIPER AND WASHER SYSTEM |
The wiper and washer system may have some of the following functions:
| Function | Note |
| Vehicle Speed-sensing, Adjustable Interval | - |
| Vehicle Speed Switching | Customize function possible |
| Stopped Vehicle Intermittent | - |
| Raindrop Sensing | - |
| Washer-linked Wiper with Drip-preventive | Customize function possible |
| Headlight Cleaner | - |
| Washer Fluid Level Warning | - |
- HINT:
- Models with auto raindrop sensing wipers do not have a driver selectable intermittent delay function.
The main body ECU LH controls the wiper system.
Front wiper operation is based on combination switch and other signals received by the main body ECU LH.
The front controller controls the washer system.
The front controller is located in the engine room No. 2 J/B.
The washer switch operation signal transmitted by the combination switch ECU is received by the main body ECU LH.
| VEHICLE SPEED-SENSING, ADJUSTABLE INTERVAL FUNCTION |
This function controls the intermittent interval of the wipers according to the vehicle speed when the wiper switch is in the INT position.
The main body ECU LH adjusts the intermittent interval during wiper motor operation according to commands received from the combination switch.
The adjustments are based on vehicle speed, braking signals, etc., and a determination of the vehicle driving conditions during the intermittent wiper operation.
- HINT:
- The vehicle speed sensing intermittent wiper function operates as a fail-safe function if there is a problem with the auto wiper function.
| VEHICLE SPEED SWITCHING FUNCTION |
When the wiper switch is turned to the LO position and the vehicle is stopped, wiper operation is automatically switched to intermittent operation.
When the vehicle stops while driving with the wiper switch in the LO position, the wiper operates twice in LO. It then switches to intermittent operation with an interval time of approximately 2.5 seconds. If the vehicle starts moving during this intermittent operation, the wiper automatically returns to LO operation.
When the intermittent wiper interval adjuster is in the FAST position with the vehicle stopped, the wiper operates in LO.
| STOPPED VEHICLE INTERMITTENT FUNCTION |
When the wiper switch is changed to the LO position while the vehicle is stopped, the wiper operates three times in LO. It then automatically switches to intermittent operation with an interval time of approximately 2.5 seconds.
When the intermittent wiper interval adjuster is in the FAST position with the vehicle stopped, the wiper operates in LO.
| RAINDROP SENSING FUNCTION |
General
The raindrop sensing function controls the wiper timing in accordance with the amount of raindrops that strike the windshield when the wiper switch is in the AUTO position.
Rain Sensor
The rain sensor consists of 2 LEDs (Light Emitting Diodes) that emit infrared rays, a photo diode that can receive those rays, a lens, and rain sensor tape.
- HINT:
- If the windshield glass is being replaced, make sure to affix new rain sensor tape. Failure to do so will lead to a system malfunction.
| WASHER-LINKED WIPER WITH DRIP-PREVENTIVE FUNCTION |
When the wiper switch is OFF, INT (modes without raindrop sensing function), or AUTO (models with raindrop sensing function) and the washer switch is turned ON for approximately 0.2 seconds or more, the wiper starts a LO operation at the same time as the washer fluid is sprayed.
The wipers will operate three times in LO after the washer switch is turned OFF.
As shown in the following chart, after the end of this operation, the wiper operates once more. It does so after an interval time (between 3 to 7 seconds) determined based on the vehicle speed so that any washer fluid drips are wiped away. The speed signal used for this function is sent by the combination meter, and received by the main body ECU LH.
The front wipers will stop operating 3 wipes after the front washer switch has been operated continuously for more than 40 seconds.
| Vehicle speed (mph (km/h)) | Interval time * |
| 0 to 36.7 (0 to 59) | Approx. 3 sec. |
| 37.3 to 49.1 (60 to79) | Approx. 5 sec. |
| 49.7 to 73.9 (80 to 119) | Approx. 7 sec. |
| 74.6 to 98.8 (120 to 159) | Approx. 5 sec. |
| 99.4 to 105 (160 to 169) | Approx. 3 sec. |
| 105.6 or more (170 or more) | No operation |
*: Interval time refers to delay that occurs before the drip-preventative final wiper operation.
| HEADLIGHT CLEANER SYSTEM |
General
The headlight cleaner system sprays washer fluid on the headlight lenses to clean them.
| WASHER FLUID LEVEL WARNING |
Based on the output of the washer fluid level warning switch, the front controller can determine that the washer fluid level has dropped below a minimum limit. Using two BEAN networks and the gateway ECU, the front controller will send a signal to the combination meter to cause a warning to illuminate on the multi-information display.