Open the door and look for the latch plate along the door s edge.
Removing door lock cylinder without key.
You must be able to do it without the key.
I did the same thing to replace my drivers door handle.
In case you lack the original key you have to replace the complete ignition switch assembly instead of just the lock cylinder.
You drive the roll pin out and the lever arm comes off of the tumbler.
I didn t get a key with mine either.
How to remove a door lock without a key.
Use the flat head screwdriver to turn the spindle in the center of the door lock cylinder counterclockwise until it stops.
I think there is a roll pin on the back of the tumbler that holds it all together.
As automobile keys are complex picking a chevy lock cylinder is much more complex than a regular doorknob.
Remove this screw using a drill or screwdriver.
Look for a small set screw at the base of the handle.