03 Tahoe rear defrost/wiper not working

So my rear Defrost is not working at all same as my rear wiper. The wiper just makes a "click click click" sound when I turn it on but doesn't move at all.

This is what I'm using to test the defrost (VDC 20)


I get a reading around 8.0 all around the defroster grid (Left and Right tab) but its not heating up at all. On the front when I turn it on theirs a "click" sound as well as when I turn it off.

When I disconnect a tab and connect it again in front on the dash it says "rear door ajar" I plug it in again and remove it again and it does the sound thingy and says "rear door ajar" again.

On my Astro I repair the grid as some were broken one side I would get this big volt reading and on the other side of the crack I would get 0 but for the Tahoe it jumps around 8.0 and docent stay steady.

How can I troubleshoot this? Can some one check the reading on their working defroster?

---------- Post added at 05:01 PM ---------- Previous post was at 03:38 PM ----------

Or just like in this post its all just a bad ground? I'm going to try this put a wire from the wiper motor the the door, that seem to fix the problem for many people here.
http://www.tahoeforum.com/showthread.php?t=3906&page=2

So because no one got to reply and needed a fix because it snowed today I ask my father if he could help me out. He ended up testing a bunch of things but the main thing is that with a regular light bulb tester the lines had 12V all the time with the defroster on, still they didn't heat up. He ended up telling me to add a wire to the driver side cable and run it to the frame of the door so this is what I ended up doing.


Defroster works perfectly now but still the rear wiper doesn't work. He said its a bad motor that I need to get it replaced so that's what I'm going to do.

Did you get the motor working With a new? I have that clicking sound too. And i blew My rear Window yesterday , a short in the passanger side connection on the glass i think. The strange is that the car was on My parking for hours and ignition off and rear defroster off. But who said electric problems where easy.

Found another site that seems to be addressing the same issue.

https://www.2carpros.com/questions/...uburban-rear-windshield-wiper-stopped-working