Power locks stopped working?

Tiny
  • MEMBER
  • 1998 FORD EXPEDITION
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 198,827 MILES
My power locks stopped working the other day, all of them, even the tailgate, don't unlock or lock with the buttons in the truck or the key fob. I checked the fuse under the hood and it's good. I know the lock relay block is behind the right side of the dash but is it really possible all three relays went bad at once.
Saturday, January 21st, 2023 AT 6:51 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
We need to check fuse #3 in the fuse panel under the hood, and if that is okay there is a system ground at the lower right kick panel.

Here is a guide to help you check for power and the fuse location in the images below:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Here are the door lock wiring diagrams so you can see how the system works. Check out the images (below). Please let us know what you find. We are interested to see what it is.
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Sunday, January 22nd, 2023 AT 11:08 AM

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