First off... Before taking the whole steering thing apart to check at the switch, I would say check your fuses... The with a small multimeter, check for voltage at the pump which is more easily accessible while having someone operate the switch. The pumps do go kaput now and then ya know... Lol.

I've seen fuses, pumps, shorts and of course switches cause this problem. It's best not to shotgun parts at it making assumptions : )

Good luck!