Hey y'all, I'm a newbie here. 2nd time owning a '02 blazer. I LOVE them.

Anywho, I noticed about a month ago my auto-locks when shifting out of park aren't locking like normal, and also when I cut the truck off the radio cuts off instead of staying on for ten-ish minutes like it used to, and of course it automatically starts chiming if I don't take out the key. Almost like a door is opened, obviously I've slammed everything shut to make sure, but still no luck. I have no clue what it could be, I'm guessing maybe an electrical problem? Ive google different things with absolutely no luck or finding anyone with the same problem. Please help! I want to keep my baby girl as she was. Thanks guys!

 

It sounds like the sensor for the door is bad so the truck thinks the door is constantly open.
Does your dome light stay on even after you close the door?

 

Yes!! I've had to shut it off and leave it off. Lol. How do I fix this? It's driving me crazy!

 

On 99-00 and newer I believe the sensor is built into the door latch. Its the piece that hold the door shut, but it also senses when the door is open or closed. Because of how much it is used, usually the drivers door is the one that goes bad. you have to take the door apart and change the latch. If you have a junkyard nearby you might be able to get one there and learn how the door comes apart at the same time.