Door Lock problems
Problem: Slider door lock engages repeatedly while driving over 20 MPH, door lock buttons do not work
Fixes I’ve tried:
Fixya suggestion ❌
If your door locks are not working and your cigarette lighter is also not working the fuse is burned out. On my 2001 astro van it is #13 in the fuse box under the steering wheel. I have replaced mine and so far no problems. Good Luck.
Source: Fixya, Internet Archive link
Next up: door lock relay
Reading a couple forums online, replacing the door lock relay may fix the issue. I’m going to try with this part number: D1780C
What fixed my problem
TBD