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What is wrong with my Door Locks besides the switch itself?

(2000 GMC 3500 Pickup)
in Houston, TX on April 01, 2013
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?
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Popular Answer
on April 01, 2013
check for power and ground to the switch
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