Checked Everything and still having the same issue.Disconnect the battery again and leave it for 15 minutes and connect again to make sure all your modules boot/reset correctly. Make sure the battery connections are clean(sandpaper) and tight. Some new terminals are narrow and need to tighten securely.
Check your ground connections to the chassis and engine, make sure they are making a good ground.
Check for burnt fuses, on the engine area and inside cabin.. Don't know if the rear fuse box fuses are critical for this..