2002 Pontiac Bonneville Owner's Manual - Page 142

Battery Warning Light (If Equipped) This light will come on briefly when you start the vehicle, as a check to show you it is working; then it should go out. Voltmeter (If Equipped) You have a voltmeter unless you have the supercharged engine. If it stays on, or comes on while you are driving, you may have a problem with the electrical charging system. Have it checked right away. Driving while this light is on could drain your battery and result in a vehicle that may stall. If you must drive a short distance with the light on, be certain to turn off all your accessories, such as the radio and comfort control system. Some instrument panel clusters with a voltmeter gage do not have a battery warning light. They have a CHECK GAGES warning to indicate a problem. On vehicles with a DIC, a CHECK CHARGE SYSTEM message will be displayed and a warning chime will sound. See "DIC Warnings and Messages" in the Index for more information. When the ignition is running, the gage shows the condition of the charging system. Readings between the shaded warning zones indicate the normal operating range. Readings in the shaded warning zones indicate a possible problem in the electrical system. On vehicles with the systems monitor, the CHECK GAGES light will also come on, and a warning chime will sound if there is a problem in the electrical system. Have your vehicle serviced immediately. 2-79