2003 GMC Envoy Owner's Manual - Page 162

Charging System Light If the air bag readiness light stays on after you start your vehicle, it means the air bag system may not be working properly. The air bags in your vehicle may not inflate a crash, or they in could even inflate without a crash. To help avoid injury to yourself or others, have your vehicle serviced rightaway if the air bag readiness light It should go out once the engine is running. If it stays stays on after you start your vehicle. on, or comes on while you are driving, you may have a problem with the charging system. It could indicate that you have problems with a generator drive belt, The air bag readiness light should flash for a few or another electrical problem. Have it checked seconds when you turn the ignition key to RUN. If the right away. Driving while this light is on could drain light doesn't come on then, have it fixed so it will your battery. be ready to warn you if there is a problem. 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. The charging system 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. 3-37