My 1991 Caravan headlights won't turn off and the highbeam indicator light stays on. I've been told that the problem is likely the daytime running lights module. Where is this module located in the vehicle and what does it look like? HarveyA

Sounds more like a stuck high beam relay. Daytime running lights module appeared sometime after '99 year. The relay should be in the fuse compartment. Pull it out to check that it is only the high beam that is on. Pull the low beam relay and place in the high beam location. If it turns on the high beams again, then try the dimmer switch to see if they go out. If that has no effect, then there is a sneak path somewhere that is turning the relay on.

In a 1992 caravan, the headlamp relay is in the engine compartment against the firewall by the passenger's hinge.