91 Imperial/New Yorker Digital Dash problems

Hello all! My friend and I are modifying his 91 Dodge Dynasty. We're basically turning it into a fully loaded New Yorker on the inside only. So digital dash, digital climate control, mahogony wood trim, power pillow seats, and a few other things. I've got everything wired precisley matching the Mitchell wiring schematics. And everything works beautifully until I turn on the headlights/parking lights. The dashboard and body computer in the Dynasty right now came from a slightly older New Yorker. The digital cluster is the one that uses the serial bus, not the one that uses the analog inputs. Anyway, when I pull out the headlight switch, the power locks pull down/lock themselves, and as long as the headlight swithc is pulled out, the lock motors stay on. As if someone was pushing the lock button and holding it down. This Dynasty came out of the factory with power locks, thats not one of my custom jobs. I'm figuring that it's my wiring of the body computer. The original body computer had only one plug, the new one required 2, and I wired up the second one, but I did not give the body computer a headlight feed wire. It wanted a low and high beam feed, plus it has headlight cover open and close outputs, obviously not required on the Dynasty. I did give it a dimmer switch feed, because I guessed it uses that to dim the digital displays. Other than that, I have no idea why the locks are acting up only when I turn on the headlights. Please help! Thanks!!!