What is wrong with my Door Locks besides the switch itself? on 2000 GMC 3500 Pickup

I replaced the master door lock switch and that did not help, still all 4 door locks are not working. What besides the master switch could be causing all 4 door locks to not be working?

by in Houston, TX on April 01, 2013
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1 answer
ANSWER by , April 01, 2013
check for power and ground to the switch