No back up lights on 2003 Chevrolet Silverado 1500

My back up lights do not work at all. The bulbs and fuses are good. Is there anything else that controls these lights? Nothing has happened to the truck to cause this problem.

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2 answers
Yes there possiably may be a problem wuth the transmission back up lite sensor . The tranny is eletronic shift only so take it to a shop and check for power at the back up lite pigtails when in reverse and foot on brake.
On heavy duty truck's there i a revere switch somewhere on the transmissoin.... If this switch i not properly working it will not complete the circuit to the revere lights... i have a 03 silverado and have had no problem like this so i dont know if that transmission has that switch or not..