***READ ENTIRE DECRIPTION BEFORE ORDERING**** Used VATS box. This is the vehicle anti theft system module, some people call it a Pass Key. This works in conjuction with the ECM and steering column. This came from a running vehicle. Please be advised that these modules are coded with a specific resistance to the original vehicle. There are 15 different combinations of the resistor ignition key, of which there is a 1 in 15 chance you have the correct key for this box, 14 in 15 chance you do not have the correct key. These cannot be reprogrammed, you need to have your ignition key re-coded to the VATS box you install. That means you will need a VATS interrogator to change VATS boxes in your vehicle. You must also replace your box with the exact same PN module or the vehicle will not start. This is module #16045121. Fits the following: 85-89 Corvette The item in the photo is the exact item being sold.