2005 GMC Savana Van Owner's Manual - Page 145

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. That's normal. StabiliTrak Not Ready Light If your vehicle has the StabiliTrak® system, this light will come on according to the description table for the StabiliTrak® system. If the light stays on, or comes on when you're driving, your vehicle needs service. 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. See Brake System Warning Light on page 3-29 for more information. The anti-lock brake system warning light should come on briefly when you turn the ignition key to RUN. If the light doesn't come on then, have it fixed so it will be ready to warn you if there is a problem. For more information, see StabiliTrak® System on page 4-9. You will hear three chimes if the light turns on and one chime if the light turns off. 3-31