While driving many accesories stop working. Wipers, radio, heater, power windows. Van still operates fine with lights, turnsignals and such continuing to work. Problem is intermittent. Sometimes I can stop, restart the engine and everything is fine...for awhile.
Problem is only when engine is running. Everything works fine with key in accesory position.

Body control module, loose connections, bad ignition switch.
You said everything works in the ACC position? well, not everything does...normally..

Tom

Body control module? Whats that and where is it?

Could be considered a small computer and it's behind the dash near the floor behind the center console. I should say that's where it is on a 96-98. Probably still there on later models. It controls the electronic functions of just about everything except the engine and transmission.

Argh!!!!!!!!! No. It's behind the Junction Block Panel behind the dash on the left bottom. Sorry, thinkin of the wrong box and wrong car. Again, thats on a 96 GC.