I checked continuity across the grid, and "got tone." I
didn't know what the proper resistance across the grid should be, so
wasn't paying attention to the actual resistance reading. Checked for
voltage AT the grid by probing the connector on the grid and grounding
to the door latch screws, assuming there would be electrical ground.
Both sides, both with the same result (zero voltage).
Assuming that you test the connector at one side of the grid (disconnected)
and got 12 volts and then checked the other side of the connector
(disconnected) and got a good ground signal you need to check the Fusible
link/cartridge fuse at the PDC under the hood. There is also another fuse in
the Junction block, I think it is fuse #6. check to see if it is not blown.
If all that is good you have to remove the A/C control head and check to see
if you have 12 volts at the blk/white wire
I was JUST going to post this very same description! My
wife's 97 Intrepid is doing the exact same thing.. No fuse identified
in the dashboard fuse panel, and nothing identified in the power
distribution center under the hood. Switch is getting power, and the
light lights up so we know THAT circuit is working properly. The
indication then is that either the switch toggles a line on a
controller somewhere, or that there's a relay somewhere that isn't
Glen, we sure could use your help on this one...
Sounds like the same problem. I've looked in the fuse panel and PDC under
the hood as well. Nothing marked for rear defrost. Nothing labelled as
such in the owners manual either. That's why I was wondering about an
inline fuse etc..
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