'99 GMC Z71 door lock question.....

[bryanw1968]

So my doors are apparently programmed to lock at like 30mph which doesn't bother me. What does bother me is when you turn off the truck they don't unlock. You have to unlock the doors manually. Any ideas? The manual doesn't mention anything that I can find.
Thanks,
B

[blyguy]

i dont beleive anything can be done from factory but we have installed many remote starters in these vehicles and turn on ignition controlled doorlocks, so when u turn off the vehicle the remote starter unlocks the doors.

[clinebarger]

The doors should unlock when you put it in park.

[onebadbowtie]

my brothers 99 GMC does the same thing and he took it to GM and they said that there is nothing that they can do to fix it.

[miracle whip]

Do you have the on board computer that tells mpg trip ect and all the stuff? i have a 01 and you can change all that stuff on there mine is on the center councel by the factory 6 disc changer. if you have that look through there

[truckdude239]

if they lock on there own its suppose to unlock when you put it back in park

[Boog]

I tell ya I just about hate these auto door locks. Been locked out more than a couple of times by them locking themselves with me on the outside looking in. I have a spare key stowed where I can get to it.
Mine lock at 15 mph and unlock when the key is turned off.

[blyguy]

i beleive that after 99 or 2000 is when they started the unlock after ignition is turned off. But before that the option wasn't there. had the same issue with a grand am.

[Ratrod60apache]

I have a '99 Silverado.
Does the same thing, it can be very irritating!

[ShredSled]

wow, that sounds like kind of a PITA.

My '02 unlocks when put in park, must be a sensor for "P". Works everytime, never been locked out either, knock on wood!
Sounds like this must have been added after your '99 was manufactured though.

[blyguy]

i beleive they started that in 01 or 02.

[67ChevyRedneck]

I turned that feature off in my truck.