Looks like it's under the center console area. Shouldn't be too crazy to remove that.
If you want a free PDF of the service manual, you can find one in The Library. The Brake Control Systems (BRC) of the manual covers other sensors that could be at fault. Hope it's not too hard, having a similar truck handy should make the proccess much easier.
If you want a free PDF of the service manual, you can find one in The Library. The Brake Control Systems (BRC) of the manual covers other sensors that could be at fault. Hope it's not too hard, having a similar truck handy should make the proccess much easier.