2007 Cadillac STS Owner's Manual - Page 192

Headlamp Washer Your vehicle may have headlamp washers. The headlamp washers clear debris from the headlamp lenses. To wash the headlamps, press the washer button located at the end of the windshield wiper lever. The headlamps will be washed after the fifth press of the windshield washer button. The headlamps must be on to be washed. If the headlamps are off, only the windshield will be washed when the washer button is pressed. If the washer fluid is low, the headlamp washers will not work. See Windshield Washer on page 191 for additional information. The headlamp washers are located to the inside of the headlamps. 192