You can probably see most or all of the installation in your van even without tools, or taking anything apart. (If you need to replace or repair the system, you'd want to remove the driver's underdash panel, as it would impede your arms and hands moving around, but you don't need to remove it just to look.)
Like Kreg and macsnjets said, that van has Passlock II.
Get under the dash and look above the brake pedal. You'll see a big bulky black connector, with all the wires going up to the steering column. Some of the wires are very thick, others very small.
The thick wires are for the ignition switch, and you'll see thick wires from the remote starter spliced in there. The thin wires are mostly for the other functions of the steering column.....turn signals, cruise control, and so forth. (You might, for example, see the remote starter spliced into the tan wire for the horn.)
Among all that, look for two yellow wires. The thick yellow is for the starter motor; that'll be connected to a thick wire from the remote starter.
There's a thinner yellow wire for the Passlock II, and there'll also be a thin Passlock ground wire (black, ORANGE / black, maybe tan) that the installer may or may not have spliced into.
OK.....hopefully that made sense so far. In short: Get under dash, observe where all main connections are made, look for small yellow Passlock wire.
There are three main ways the installer could have dealt with the Passlock II to get the van to remote start.
1: Cut yellow wire in half, connect appropriate resistor to "body" end, splice other end of resistor to Passlock ground wire. NOTE: This is nearly free, but it permanently bypasses the car's anti-theft system, making it much easier to steal now. As Kreg mentioned, most installers would not do it this way, but it does happen sometimes.
2: Cut yellow Passlock wire in half, connect both halves to an interface module made for using remote starters on Passlock-equipped vehicles. The module also needs to be connected to ground, and most installers use the car's Passlock ground wire, not just the chassis ground on the car's body.
Probably the most popular Passlock interface on the market when your van was new was the 555L by Directed Electronics. It's a black box about half the size of a pack of cigarettes, and you'll see yellow, yellow/black, and black wires connected at your steering column.
3: The installer could use one (or is it two? I always forget!) relays and a resistor to essentially build his own 555L. The installer might do this to save money on product cost, or possibly didn't have the 555L in stock at the time of installation.
SUMMARY: Find the wires for Passlock II. Either the yellow wire is split in half and run through some kind of interface, or just the "body" side of the yellow is grounded permanently through a resistor, and the "key" side is left disconnected.
If you wish to remove the remote starter, all you'll really need to do here is to re-connect the yellow wire that was previously cut in half, and the van's factory anti-theft system should be functional again, and the engine should still start.
NOTE: There are other yellow wires in that harness of the same size and color. If you decide, for any reason, to cut another one of them in half, you'll have a hard time figuring out which end goes where. Deal with your Passlock before you decide to do anything with any other yellow wire in there, so you don't get mixed up.
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