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You may need a shop manual to get thru this. There is a body computer and a front control module that affects headlights among other things. The front control module has drivers for each light on each side. All of the lights use the same ground so that should be ok. The headlight switch sends a signal to the module and it controls the lights.
It can be issue with headlight switch,but as its already been replaced.Try disconnecting high beam headlight wiring from headlight assembly and reconnect direct external wire from headlight switch to headlight assembly,then by switch see if headlight is getting off and turning on or not. See below related help links,similar to your issue.Click the link below:---- Only high beams work but head lights not
working on Ford F350?
the headlamps are controlled by the IPM (intellegent power module) which is a fancy name for the underhood fuse box. The fuse box has its own computer that controls lighting. The only thing you can do is check for power the the drivers side headlamp. The drivers side low beam is power by the white w/ dark blue wire. If there is no power then a trip to your dodge dealer is the next step.
It is possible that there is an issue with the ground wire so make sure the ground wire is grounded.
On the van you have a high beam fuse and relay. On the low beam you also have a fuse and relay. Check the fuse/relay panel for a blown fuse controlling the low beam lights. If you do not find a blown fuse have some one to turn the key on and turn on the high beam lights> During this time locate the low beam headlight relay and place your finger on top of relay, have the other person to switch from high beam to low beam lights. You should feel a click in the relay when they make the switch from high to low beam. If not replace the relay and the problem should go away. Hope this will help you.
Unscrew the three screws that secure the headlight assembly to
your Dodge Caravan. Put the screws in your pocket or another safe
place, so you won't lose them before reinstalling the headlight
the headlight assembly away from the front of the vehicle. Turn the
bulb retaining ring counterclockwise to unlock the electrical
connector. Remove the electrical connector from the bulb assembly by
pulling it straight out.
the old bulb with a new halogen headlight bulb. Connect the
electrical connector and turn the bulb retaining ring clockwise to lock
the bulb into place.
the headlight assembly and secure the screws tightly before closing the
hood. Turn on your Dodge Caravan, flip on the headlights and verify
they're working properly.
replace the headlight bulbs. Usually when the bulbs blow out the low beam blows out first, but the high beams still work.
If you want and need both low and high beams to work then replace the headlight bulbs with brand new ones and I garauntee that both low and high beams will work
although the underhood relay panel is common, I'd check your headlamp bulbs first, these are cheaper than the fuse box. The daytime running lights work off the high beam circuit, thus, a blown highbeam bulb could be the culprit, the fusebox solution was more common on 2001 and up modles, although it's a definite possibility.
on most vehicle from that period there is a trim piece around the headlight that can be removed to access the actual mechanism that holds the headlight in place, usually a ring around the light. do not confuse the headlight adjusting screws only on one side or only the top or bottom for the headlight mount screws.