tailgate will not unlock after locking

2005 GMC YUKON

135,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC

AMY SPROUSE DEMOSS

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Hello, I replaced the actuator today in the rear tailgate but it did not solve my problem. The key fob will lock the back hatch and window but will not unlock it.

Any help would be much appreciated!

Mar 28, 2018 at 7:03 PM

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Hello,

Yes, is sounds like you have a unlock relay that is not working. Here is a guide to help test it:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Here are the wiring diagrams and relay location so you can see how the system works and to replace the relay. The relay is in the interior fuse panel.

Check out the diagrams (below).

Please let us know what happens.

Cheers, Ken

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Mar 30, 2018 at 11:40 AM