2005 Cadillac DeVille Owner's Manual - Page 162

If the airbag readiness light stays on after you start the vehicle or comes on when you are driving, your airbag system may not work properly. Have your vehicle serviced right away. Charging System Light When you turn the key to ON or START, this light will come on briefly to show that the generator and battery charging systems are working properly. {CAUTION: If the airbag readiness light stays on after you start your vehicle, it means the airbag system may not be working properly. The airbags in your vehicle may not inflate in a crash, or they could even inflate without a crash. To help avoid injury to yourself or others, have your vehicle serviced right away if the airbag readiness light stays on after you start your vehicle. The airbag readiness light should flash for a few seconds when you turn the ignition key to ON. If the light does not come on then, have it fixed so it will be ready to warn you if there is a problem. If this light stays on, you need service and you should take your vehicle to the dealer at once. To save your battery until you get there, turn off all accessories. See DIC Warnings and Messages on page 3-60 for more information. 3-46