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There are 3 wing nuts holding the headlight bracket. Remove these and unplug wire going to headlight. Remove bracket from van and then the headlight can be removed from bracket.
It is built into the headlight switch.
Inside the headlight switch.
You have to reach up behind the dash and push a small spring loaded button on the headlight switch, then the knob and shaft will pull out as one.
I've got a better question, why is this question in the Chevy venture forum ?
Remove seats
replace rear window wiper motor on 2001 Chevy venture
dimmer switch is on the turn signal lever, to replace you need to remove steering wheel
When the headlight switch fails, you'll need to replace the entire combination switch. Here is the procedure to replace the headlight switch on your Chevy Cavalier: 1) Unscrew the screws on the bottom and top of the steering wheel column cover, using a screwdriver and pull the bottom and top of the steering wheel column cover forward and down to remove it. 2) Unscrew the two screws that hold the headlight switch to the steering column. Pull the headlight switch off the steering column. Unplug the electrical connector running to the headlight switch. 3) Connect the electrical connector to the new headlight switch and secure the headlight switch to the steering column using the factory mounting screws and a cross-point screwdriver. Reassemble the steering column cover.
There are 3 wing nuts holding head light bracket, remove these and unplug wire, lift out bracket, then remove headlight from bracket.
it does not have one.