1998 GMC Sonoma Owner's Manual - Page 120

Charging System Indicator Light If the air bag readiness light ever comes on when you have turnedoff the airbag, it meansthat something may be wrong with the airbag system. The right front passenger's air bag could inflate even though the switchis off. If this ever a happens, don't secure rear-facing child restraint in yourvehicle until you have your vehicle serviced. 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. (+I It should go olrt 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. It could indicate that you have problems with a generator drive belt, or another electrical problem. Have it checked right away. Driving while this light is on could drain your battery. 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. 2-56