As most of you may know the fan relay is a solid state unit on the 96+
caravans.

My friend's caravan's a/c/rad fans are not coming on when they're supposed
to and I checked out the fans today by directly connecting the fans to the
battery and they work fine.

However, before I go out and buy a new fan relay from dodge I want to know
if there is supposed to be a reference signal from the pcm module on the
light green wire that hooks up to the fan relay.

When I jump the dark green wire and the gray wire the fans kick on high
speed meaning that they work.  But when I measure the reference signal from
light green to ground there is nothing coming from the PCM.

Is there supposed to be no voltage from the pcm module?

How can I for sure confirm that the fan relay module is bad?
Thanks