I have an '04 Silverado so my presumption is that our power locks are
similar in function. That being said, what you are experiencing is
perfectly normal. Allow me to explain...
When you shut off your truck and get out WITH ANY DOOR LEFT OPEN and you
press the power lock button ONCE (or the lock button on the remote ONCE),
the door chime will ring three times. What happens then is your doors do
not lock right away, but after the last door is closed the locks will lock
after a 5 second delay. This is to give you a "last chance" to open a door
within that 5 seconds just in case you forgot something inside the truck.
If you open a door prior to the 5 seconds, it will delay again and wait
another 5 seconds after the last door is closed before the locks lock.
When you shut off your truck and get out WITH ANY DOOR LEFT OPEN, if you
press the power lock button TWICE or the lock button on the remote TWICE,
then the door locks will lock right away regardless if there is a door still
Now comes the tricky part - if you have ALL THE DOORS CLOSED and you press
either the power lock button ONCE or the lock button on the remote ONCE,
then the door locks will lock right away. This is the difference - either
all doors are closed or one door is still open. If you press the remote
button a second time, the horn will beep once to let you know that the truck
And if that weren't enough, if you tried to lock the doors with the remote
with the key still in the ignition and the truck off, the driver's door will
automatically unlock. This prevents you from accidently locking your keys
in the truck.
If you want to recreate what is happening to you then shut off the truck,
get out, leave the door open, press either lock or remote button ONCE, shut
the door, then count to 5. At the count of 5 your doors will lock. You are
not nuts, but you should read your owner's manual!
Here's the abbreviated version:
Any Door Open - First Press = 5 sec. Delay after last door closed; Second
Press = Locks immediately
All Doors Closed - First Press = Locks Immediately; Second Press = Horn
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