GM Service Manual Online
For 1990-2009 cars only

The dome override button is located below the exterior lamps knob.

Press to turn the dome lamps off. The dome lamps will remain off when a door is open. This overrides the illuminated entry feature unless the Remote Keyless Entry (RKE) transmitter is used to unlock the vehicle. Press the button again to return the lamps to automatic operation. The dome lamps will come on when a door is opened.