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Yes it is called the body control module and is notorious for going bad, don't try to save any money buying it in a junkyard since these modules are PART number specific to each van. The dealer will have to flash it which means you will spend about 900 to 1000 to replace it including labor. But it's the only way to get it to work.
Current goes from the switch to the body control module THEN to the wipers which is why they are not working.
As the intermittent wipers are based on resistance, try the easiest fixes first:1. Disconnect the negative terminal on the battery. Pull the relays for the blower motor and both wiper relays and the 30 amp fuse for the wipers. These are located under the hood in the fuse/relay box. The best way is to be careful and use a set of pliers. The reason you pull the blower relay is so that it is easier to pull the intermittent relay. Clean these off the blades of the relay with a burnishing tool (in a pinch you can use your wife's nail polisher that is like very fine sandpaper. Once the are a pretty silver color, wipe them off with some rubbing alcohol. Put them in and pull them out about 5 times into the relay socket and leave them in. Clean the blades for the fuse with a cue tip and rubbing alcohol and then put the fuse in and pull it out about 5 times then leave it in. Hook up the negative terminal and take the key to the on position and turn the wiper to the lowest position. If it works if should take about 36 seconds between strokes. 2. The next easiest is taking the cover off the top of the steering column and pulling off the wiper switch and replacing it. There are three screws that hold the cover and two that hold the switch plus the electrical connector. You can buy a used one at a "junk yard" for about $20. 3. Replace the wiper motor (takes about a couple of hours start to finish). It involves removing the wipers, the cowl (plastic cover over the wiper motor right below the windshield), loosening and lifting the scissor arms for the wiper arms and removing the motor (this involves disconnecting the power connector and feeding it back to the motor).Hopefully your issue is like 95% of the wiper issues and it is just a little bit of corrosion on the wiper relays and fuse!
I think you need to replace the Body Control Module (BCM), My newly replaced BCM (used) fixed my wiper problem but created a new problem which the left turn signal is not working now. Time to sell the van.
I had a similar problem with a 2000 Dodge Grand Caravan. The windshield wipers turned on when someone turned the heater on in the car. They would not turn off at all, even when the car was turned off and keys were removed from the ignition. The only way to get them to stop is to pop the hood and find the fuse box on the van, and remove the 30 amp fuse for the windshield wiper. After removing the wiper motor and finding it was fine, we discovered the problem was in the relay in the fuse box. This relay is a little black box right next to the windshield wiper fuse and there are two of them, one for on/off and another for speed control. Our On/Off Relay had gone bad and was stuck in the on position, but it sounds like your Speed Control Relay may be bad. A new relay costs ~10$ at an auto part store. Just unplug the old one and plug in a new one, no need to unscrew anything, this was a 1 minute fix.