Can you tell me if this is the original radio? Has any other work been done to the van prior to it not working? What does the radio display? Does it say "locked"?
The radio you have in that van is an RDS radio. This means that there is no theft lock code to enter. It gets it's information from another module in the vehicle. If it says locked, it is getting a conflicting vin number from what is stored in its memory to what is seeing now. You will need to take it to a dealer and have them relearn or reset up the radio theft lock so that the vin numbers match again. There is nothing you can do yourself.
If the dealer can't set up the radio, there may be a problem with the radio or the module that supplies the information to the radio is not communicating the information the radio needs.
Hope the helps.
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