2004 Pontiac Bonneville Owner's Manual - Page 162

Voltmeter Gage When your engine is not running, but the ignition key is turned to ON, this gage shows the state of the battery charge in DC volts. 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. On vehicles with a DIC, a CHECK CHARGE SYSTEM message will be displayed and a warning chime will sound if there is a problem in the electrical system. Have your vehicle serviced immediately. See DIC Warnings and Messages on page 3-61 for more information. Brake System Warning Light Your vehicle's hydraulic brake system is divided into two parts. If one part is not working, the other part can still work and stop you. For good braking, though, you need both parts working well. 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. If the warning light comes on, there is a brake problem. Have your brake system inspected right away. 3-42