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Door locks not working properly?

Tiny
CAPTKCP
  • MEMBER
  • 2004 GMC YUKON
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
I'm having issues with unlocking the doors. If all the doors are closed, I cannot unlock the doors from the driver's side, but I can from the passenger door. If the passenger door is open, I can unlock the doors from the driver's side. The doors will also unlock when the vehicle is placed in park.
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Friday, August 25th, 2023 AT 2:23 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,512 POSTS
It sounds like the BCM is going out but to be sure let's check the power (fuses) and grounds for the system. Here are the door lock wiring diagrams so you can see how the system works and which fuses to check. This guide can help you test the power and grounds:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Saturday, August 26th, 2023 AT 12:37 PM

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