2006 Hummer H2 Owner's Manual - Page 150

To activate Automatic mode for de-icing, press the heated washer switch. The indicator light starts to flash at a one second rate. Once the washer fluid is heated, approximately 25 seconds, it is sprayed on the windshield. This cycle will repeat four times (approximately every six seconds) and then the unit will return to Standby mode. Pressing the heated washer fluid button at any time during this cycle will stop the Automatic mode and return it to Standby. Automatic mode is recommended while the vehicle is parked. In the case of a rapidly flashing light indicator on the heated washer switch, it may be necessary to wait for up to one minute for the light to stop flashing, then cycle the ignition. {CAUTION: In freezing weather, do not use your washer until the windshield is warmed. Otherwise the washer fluid can form ice on the windshield, blocking your vision. To turn the rear wiper on, turn the knob to either 1 or 2. For long delayed wiping, turn the knob to 1. For short delayed wiping, turn the knob to 2. Rear Window Wiper/Washer (SUV) If your vehicle has a rear window washer/wiper, the control knob is located on the instrument panel to the left of the steering wheel. 9(Off): To turn the wiper off, turn the knob to this symbol. =(Washer Fluid): To wash the window, press the knob with this symbol. The rear window washer uses the same fluid reservoir as the windshield washer. However, the rear window washer will run out of fluid before the windshield washer. If you can wash your windshield but not your rear windows, check the fluid level. 3-10