The B code is your front impact sensor I believe, should be one of the 2 (some pickups only had one) under the radiator support.
Knock sensor codes are no surprise, I'm sure when you pull them you'll find the rear sensor corroded and maybe even water still in the hole.
Looks like the B1000 might be your airbag module, the "sensing and diagnostic module". It's under the drivers seat IIRC, pretty easy to swap out. We put one in my brother-in-laws pickup after he hit a deer. Used ones are usually fine, or you can spend the money on new if you like.
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