Door lock relay issues

[2005SnowKon]

Have any of you guys have had issues with your door locks before. I have a 05 Yukon door locks worked just fine until I switched them out to test in another Yukon I'm working on. Now only the fronts will unlock. Nothing going on in the rear. Rears with only lock. Where is my truck gremlin hiding??


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[blue70chevelle]

Yep. I had the same problem. There are two relays in the fuse box located just inside the drivers door. One is for the unlock, and one is for the lock. Those relays oddly enough only control the rear locks and the hatch. Switch them and the problem should be opposite of what you have now. That's the best way to trouble shoot it. Just buy a new relay though. They're like $8.
This is a known problem with these trucks..