02 dodge caravan unlock

I had a similar problem with a 2006 Caravan.

Does the van have the factory alarm?  If it does, when you lock the van with the factory remote or the drivers door lock button, after 30 seconds or so it will not allow an unlock from anything other than the factory remote.  I found that if you remote start it first, it will allow the R/S fob to unlock the doors again.   The R/S fob would always work if you never used the factory fob or the driver door lock button.

Another possibility is the resistor value.  I found that the 2006 Caravan needed a higher resistance on the Parking Light Mux wire than was listed.  You could try a slightly higher or lower vaule on the unlock pulse.

According to the Bulldog web site, there is a DisArm wire.  If you give it a (-) pulse thru a 9000 ohm resister it will disarm and a double pulse will also unlock the doors.  It's a PURPLE / Blue wire at the BCM connector 3, pin 14.

Good luck.