2008 Hummer H3 Owner's Manual - Page 166

Charging System Light This light will come on briefly when you turn on the ignition, but the engine is not running, as a check to show you it is working. Up-Shift Light Your vehicle may have an up-shift light. It should go out once the engine is running. If it stays on, or comes on while you are driving, you may have a problem with the charging system. A charging system Driver Information Center (DIC) message may also appear. See DIC Warnings and Messages on page 3-43 for more information. This light could indicate that you have problems with a generator drive belt, or another electrical problem. Have it checked right away. If you must drive a short distance with the light on, be certain to turn off all your accessories, such as the radio and air conditioner. When this light comes on, you should shift to the next higher gear if weather, road, and traffic conditions allow you to. See Manual Transmission Operation on page 2-26 for more information. 3-32