I would unplug the battery for about 15-20 minutes, which will completely reset the computer. If it is still on after that, I am out of ideas...possibly a short in the dash that is tripping the light bulb to stay on.
post back and let us know if unplugging the battery solves it.
Matthew 26:52-54 / Go Pack Go!
2001 GT Convertible - Geared / Cammed / Dyno Tuned 263rwh/290rwt
1994 V6 Convetible - Stock
2009 Malibu LTZ - Stock