Wiper/washer Systems: Other Lexus ES XV30 facelift

RAIN DROP SENSOR

Note. If the rain sensor tape has been peeled during a windshield glass replacement, make sure to affix a new rain sensor tape. Failure to do so will lead to a system malfunction.

When the wiper switch is in the AUTO position, this function uses a rain sensor that is mounted on the front windshield glass to detect the amount of rain drops and controls an optimal wiping timing accordingly. (Scheme 16)

The rain sensor consists mainly of an LED (Light Emitting Diode) that emits infrared rays and a photo diode that receives those rays. (Scheme 17) The detection method is based on the infrared rays that are reflected by the front windshield glass.

For example, if no rain drops are present in the detection area, the infrared rays emitted by the LED are all reflected from the windshield glass and are received by the photo diode. If rain drops are present in the detection area, a portion of the emitted infrared rays penetrates with the change of index of reflection outward of the windshield glass via the rain drops, thus reducing the amount of infrared rays that are received by the photo diode. The amount of this reduction is then used to detect the amount of rain drops. Thus, this function controls the INT, LO and HI operations in order to operate the wipers at an optimal wiping timing.

Scheme 16

Scheme 17

WINDSHIELD WIPER POSITION

The wiper blades retract under the hood when the wipers are turned off. In the following cases, the wipers should be shifted from the retracted position (position 2) to the rest position (position 1) above the hood level

1. When cleaning the windshield.
2. When inspecting or replacing the wipers.
3. When the retraction may be obstructed by snow, etc. at the bottom of the windshield.

Other than the above cases, keep the wipers in the retracted position.

Note. To prevent the wiper blades from being deformed, be sure to hold the connection of the wiper arm and wiper blade securely.

Shifting To Rest Position

Hold the connection of the wiper arm and wiper blade and pull it upward for more than 3.9" (10 cm) along the windshield glass with the force of about 22 lbs. (98 N).

Shifting To Retracted Position

Note. To prevent the wiper blades from being deformed, be sure to hold the connection of the wiper arm and wiper blade securely.

Push the connection of the wiper arm and wiper blade downward.

Rain Drop Detection Type

To turn the wipers on, move the lever down until you reach the desired speed setting. The ignition speed setting. The ignition switch must be in the ON position. There are 3 settings

1. AUTO position: Automatic operation
2. LO position: Low speed operation
3. HI position: High speed operation

The wiper speed is determined by the amount of rain drops and sunlight detected by the automatic wiper control sensor. Twist the automatic control adjuster in the negative (-) direction to lower the sensitivity and the positive (+) direction to boost the sensitivity. Even if the wiper lever is in the AUTO position, the system will switch to intermittent operations in the following conditions

1. When the windshield gets extremely hot, at more than 176°F (80°C) or cold at less than 14°F (-10°C).
2. When the system malfunctions.

When the ignition switch is turned off with the wiper lever in the AUTO position and then the ignition switch is turned on again, the automatic operation may not work even if rain drops are on the windshield. In this case, move the lever to another position and return it to the AUTO position again. When the wiper lever is in the AUTO position with the ignition switch on, the wipers could operate automatically in the following cases

1. If you touch the upper center of the windshield adjacent to the sensor.
2. If you wipe the upper center of the windshield (adjacent to which the sensor is located) with a towel.
3. If the windshield vibrates.
4. If you touch the sensor.

To make the washer squirt, pull the lever toward you and release it. Also, the wipers will automatically operate a couple of times after the washer squirts even with the lever in the OFF position. The low washer fluid warning light in the instrument cluster comes on when the fluid level in the tank becomes nearly empty.

WASHER NOZZLE

Do not clean or adjust the washer nozzle with a safety pin etc. because the washer nozzle tip is made of resin and could be damaged. Adjustment is not necessary because the washer nozzle is the spray type. In case the washer nozzle is clogged with wax etc., remove the objects and clean the nozzle hole with a soft resin brush.

SYSTEM TESTS

SYMPTOM INDEX

TERMINALS OF ECU

For inspection of the windshield wiper relay assembly and rain sensor terminals (Scheme 18)

Scheme 18

WASHER MOTOR

1. Pour the washer fluid into the washer jar with the washer motor and the pump installed to the washer jar assembly.
2. Connect the battery positive (+) to terminal No. 2 of the washer motor and the pump, the battery negative (-) to terminal No. 1 of the washer motor and the pump. (Scheme 19) Check that the water comes out from the washer jar. Replace washer motor as necessary.

Scheme 19

WIPER MOTOR

1. Check the LO operation as follows. Connect the battery (+) to terminal No. 1 (+1) of the connector, the battery (-) to terminal No. 5 (E) of the connector and check that the motor operates with the low speed (LO). see scheme 22
2. Check the HI operation as follows. Connect the battery (+) to terminal No. 4 (+2) of the connector, the battery (-) to terminal No. 5 (E) of the connector and check that the motor operates with high speed (HI).
3. Check the automatic stop operation as follows. Connect the battery (+) to terminal No. 1 (+1) of the connector, the battery (-) to terminal No. 5 (E) of the connector. With the motor being rotated at low speed (LO), disconnect terminal 1 (+1) to stop the wiper motor operation at any position except the automatic stop position. Using a Diagnosis Check Wire (SST 09843-18020), connect terminal No. 1 (+1) and No. 3 (S) and the battery (+) to terminal No. 2 (B) to restart the motor operation at low speed. Check the automatic stop position. (Scheme 20) Replace wiper motor as necessary.

Scheme 20

WIPER SWITCH

1. Check the continuity of each terminal of the wiper switch assembly connector. See «INSPECTING FRONT WIPER/WASHER SWITCH CONTINUITY»(ref-152463-S26804493512003020600000). see scheme 22 INSPECTING FRONT WIPER/WASHER SWITCH CONTINUITY Switch Position Tester Connection Specified Condition Front Wiper Switch MIST 7 (+1) - 17 (+B) Continuity OFF 16 (+S) - 7 (+1) Continuity INT (1) 16 (+S) - 7 (+1) Continuity AUTO (2) 16 (+S) - 7 (+1), 4 (AUTO) - 14 (E) Continuity LO 7 (+1) - 17 (+B) Continuity HI 17 (+B) - 8 (+2) Continuity Front Washer Switch OFF..... No Continuity ON 11 (WF) - 2 (EW) Continuity (1) Without AUTO wiper system. (2) With AUTO wiper system.
2. Check the intermittent operation as follows. Connect the voltmeter (+) terminal to terminal No. 7 (+1) of the connector, the voltmeter (-) terminal to terminal No. 2 (EW) of the connector. Connect the battery (+) to terminal No. 17 (+B) of the connector, the battery (-) to terminals No. 2 (EW) and 16 (+S) of the connector. Turn the wiper switch to INT. Connect the battery (+) to terminal No. 16 (+S) of the connector for 5 seconds. Connect the battery (-) to terminal No. 16 (+S) of the connector. Voltage should be as shown in illustration. (Scheme 21)
3. Check the front wiper operation as follows. Turn the wiper switch to OFF. Connect the battery (+) to terminal No. 17 (+B) of the connector, the battery (-) to terminal No. 16 (+S) and 2 (EW) to the connector. Connect the voltmeter (+) terminal to terminal No. 7 (+1) of the connector and the voltmeter (-) terminal to terminal No. 2 (EW) of the connector. Turn the washer switch to ON and OFF. Voltage should be as shown in illustration. (Scheme 22)

Scheme 21

Scheme 22