Removal of Instrument Cluster Trim Plate for 2001 Chevrolet Express Van
1st remove the center lower trim panel (officially called the IP Extension Trim Plate). Pull on the left side of it to disengage the metal clip. The right side has plastic tabs that could break off if you pulled on that side. It should pop right out.
Next remove the plastic piece below the steering wheel (officially called the instrument panel cluster trim plate filler). Grab it and pull it straight back towards you and it should come right out.
Now to remove the instrument panel trim plate. The instructions tell you to set parking brake and block the wheels. This is because you will have to turn on the key to move the shift lever out of park into the first gear position. Then you are to pull on the left corner, the right corner and the top to disengage the metal clip retainers to work the entire trim panel loose. You will then have to disconnect the electrical connectors from the switches in the instrument panel trim plate to remove it. I had to disconnect the light switch and the fog light switch. The instructions told me to rotate the trim plate counterclockwise but I had to rotate mine clockwise to get it off. With a little wiggling and squeezing it can be done. Good luck!
If you are trying to get at the multifunction alarm like I was, you will find it at #2 in the following diagram. The green wire in my 2001 van was the one in its wiring connection that controlled the door alarm. That is the one I cut and inserted a switch.