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02 Trailblazer locking issue

After parking my trailblazer yesterday i found that my keyless entry does not work, my dome lights dont come on when i open my doors, and the rear hatch wont lock. Any suggestions?

Replace the battery in your remote. If that doesn’t work, replace the battery in your Trailblazer.

I would also look into your owners manual for any fuses that pertain to these devices. After that I’d literally use continuity tester to see if any fuses have blown out. If your interior light doesnt come on with door open suggests a fuse to me. Sometimes the fuse or circuit described in the manual isn’t as intuitive as it could be which is why a continuity tester is your friend for checking fuses.

Your vehicles battery connections are another thing to check… They need to be clean and tight.