Doors lock when you turn on the key

[Smokey73]

I've got a '97 crew cab F-350. When you turn the key on, the doors automatically lock after 5 seconds and again 5 seconds after you start it. My question is: Is there a door lock module or relay or somthing of that sort, that may be telling the doors to lock. The truck doesn't have RKE or an aftermarket alarm. Any input is appreciated.

 

[Smokey73]

???

 

[Smokey73]

bump

 

[Smokey73]

bump

 

[OLDBULL8]

Nothing wrong with that, that's to keep all those (you know who) from hijacking your truck. Your drivers side door should unlock when the key is turned off. That second locking sequence is supposed to happen when you reach a certain speed, I think 10 MPH.