Yes ,, if you have factory installed power locks ,, call a GM dealer and ask for the parts dept and give them the VIN# and they can tell you if your van came with the RKE option which is Remote Keyless Entry , if it did then all you need to do is buy a key fob remote and you have a remote.
If your van did not come with the RKE option you can go to a salvage yard and get the RKE Receiver from behind the radio and wire it into your van ,,,,,but the factory unit only transmits to about 30 feet away from van ....so depending on what your preference is ...you can buy an aftermarket remote start system and install it and it will have the Remote entry feature and you just wire it in ...that way your time spent installing accomplishes a significant amount of features.