2003 GMC Sierra Denali Questions

All 2003 GMC Sierra Denali Questions

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system is engaging and it gives the sound of a bad brake booster..
and the brakes to engage without me stepping on brakes.
When the rear streering is engaged electricly, it goes into gear but a light comes on that says;"Service". The steering works for that one time and then disconnects or goes out of gear and back to two wheel streerin...
I can't lock, or unlock vehicle with remote. The panic button on remote does nothing either. I changed batteries in both remotes, nether one works. Also,the power window, and door locks on passenger side are in-operat...