I used to have an 04 and there was no auto locking system in the vehicle at all. I used to have to manually do the electric locks myself after cranking and starting to drive the vehicle. The only thing the locks would do automatically would be if you unlocked the vehicle with the remote and didn't open a door within approx. 3 minutes, the doors would lock back.
Old - 04 MDX RRP/S Touring with Navi with various accessories
New - 12 MDX Advance CBP/Ebony, silver roof rack with crossbars, towing package, Advance running boards, back up sensors, BSM, window tint, Acura remote starter and full size spare.