When the remote is used the doors lock and unlock, but if you try to use the internal door lock buttons, they move but no action occurs. I have checked the fuses and all are good. What else could it be?
SOURCE: Code for automatic door locks on 1999 Chevy silverado
you have to take it into the dealership for a 1999. the dealer needs to change the settings in the BCM (body control module). in 2000, the BCM came preprogrammed to allow the owner to change the door lock settings at home. unfortunately for a 1999, it has to be done at the dealership.
SOURCE: 2005 silverado door locks
i work at a chevy dealership,just had the same problem my fix was to replace the power door lock relay located on drivers side interior fuse block
SOURCE: 2005 chevy silverado 4 door rear locks
Sound like the door actuators are bad if you take it somewhere take it to a dealer auto body shop Its Cheaper
SOURCE: Remote Door Lock/Unlock will not work.
At first look, I would have guessed that your battery in the door opener was dead, but that is not the case. I suggest driving to a nearby Chevy dealer and ask one of the salesman if he/she can help. They have always been helpful to me. If not try another one as they are in business to sell not only cars, but service also. They will be your best bet to fixing it. :D
SOURCE: Driver and Passenger auto door locks are inop.
Sounds like bad wiring, or bad door lock actuators. Check for power while locking/unlocking the doors.
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