interior lights problem

i have a 98 venture ls, and the interior lights won't come on automatically like they used to. when you lock the car, they'd come on then dim automatically. when i used to open a door, they'd come on. they only come on when i physically turn on the switch in the overhead console. what is my problem with these interior lights?

thanks for the assistance.:confused:

I believe there are some programming options as far as lights, alarm setup, etc. If you have the owners manual i believe they are in there, they are for my 2000