2004 Chevrolet Avalanche Owner's Manual - Page 201

Anti-Lock Brake System Warning Light With the anti-lock brake system, this light will come on when you start your engine and may stay on for several seconds. Low Tire Pressure Warning Light This light and a chime will come on along with the CHECK TIRE PRESSURE message in the DIC when one or more of your tires is significantly under-inflated. This light will also come on briefly when you turn the ignition to RUN. See "CHECK TIRE PRESSURE" under DIC Warnings and Messages on page 3-60 for more information. Stop and check your tires as soon as possible, and inflate them to the proper pressure as indicated on the vehicle's certification/tire label. See Tires on page 5-64 for more information on your vehicle's tires. That's normal. If the light doesn't come on then, have it fixed so it will be ready to warn you if there is a problem. If the light stays on, or comes on when you're driving, your vehicle needs service. You will also hear a chime sound when the light is on steady. If the regular brake system warning light isn't on, you still have brakes, but you don't have anti-lock brakes. If the regular brake system warning light is also on you don't have anti-lock brakes and there's a problem with your regular brakes. In addition to both lights, you will also hear a chime sound on the first occurrence of a problem and each time the vehicle is shut off and then restarted. See Brake System Warning Light on page 3-37. 3-39