Neutral safety switch location

On that van it is a part of the transmission range sensor which is located inside the transmission and requires that the valve body be removed from the transmission to service it. To remove the valve body you disconnect the battery, then lift the car high enough to get under it. Then you need to remove the transmission pan and drain the fluid, then you remove the filter. Next you disconnect the manual shift lever from the shaft that goes into the transmission, then remove 16 of the 18 bolts that secure the valve body in place. Loosen the remaining two to allow you to move the valve body a little. Then you need to rotate the manual shift shaft clockwise to low gear. Next you need to remove the parking roller and shaft. Once those steps are done you can remove the valve body. Now you can access the range switch on top of the valve body to replace it. Then you reverse the process to install the valve body back in. Be very careful as dropping it or banging it can easily damage it. Install a new filter and o-ring. Then apply a bead of silicone around the pan as shown, Then add a small bit under each of the pan bolt heads.
The valve body bolts are torqued to 105 inch pounds.
The pan bolts are torqued to 165 inch pounds.
Refill the transmission with ATF+4 rated fluid.
Now you need to do the Transmission Quick Learn procedure using a scan tool. For that you follow the directions on the scan tool.