2007 Toyota Avalon Owners Manual - Page 558

Windshield wipers and washer (raindrop detection type) Automatic control adjuster Even if the wiper lever is in the position 1, the system will switch to intermittent operations in the following conditions: D When the windshield gets extremely cold (at less than −10_C [14_F]) D When the system malfunctions However, when the windshield gets extremely hot (at more than 90_C [194_F]), the wipers do not operate even if the wiper lever is in the position 1. As soon as the vehicle starts to move, the wiper will operate once to clear the driver's front view if it is set to "AUTO". To turn on the windshield wipers, move the lever to the desired setting. The ignition switch must be set at ON. Lever position Position 1 Position 2 Position 3 Position 4 Position 5 Operation Automatic operation Low speed operation High speed operation Single sweep operation Washer on Automatic operation (position 1) The wiper speed is determined by the amount of raindrops and sunlight detected by the automatic wiper control sensor. The automatic wiper control sensor is on the inside of the windshield as shown above. If you feel that the operation of the automatic wiper control is too fast or too slow, twist the automatic control adjuster in the "−" direction to lower sensitivity, and "+" direction to boost the sensitivity. 138