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Re: 98 silverado power locks
My dad has a 98 and the doors only did the auto lock until I disconnected a relay for the lock that was part of the remote start system that was installed by a previous owner. Can't find anything in service manual about enabling auto locking either. You can get horn confirmation by connecting pin 4 to pin 8 at the DLC with the key off and cancel horn confirmation by connecting the 2 pins with the key on, I am not sure if you need to program transmitters again when this is done or not.
I would check behind the driver's kick panel to see if something has been wired in, somebody could have just made their own auto lock with a relay or two
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