When i turn on my rear defrost, the light comes on, but only the bottom 1/2 of the rear window defrosts. I do not see any scratches in any of the defrost lines. Is there a relay or a fuse for the upper 1/2 and one for the lower 1/2?
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Check obvious things first, fuses. Pull out your manual and look for locations. Second, there should be 2 wires going to the grid on the rear window defroster. Make certain they are still plugged in and the tabs have not been broken off, frequently happens at car washes when washing rear window. Third, take a close look at the grid of wire on the glass, looking for scratches. If scratched, you may be able to repair with a rear window defogger kit from your local auto store
Check to see that the wires that connect to the rear window are indeed intact...then you will need to look at the lines in the window to be sure none of then are broken...to go further, you will need a voltmeter...hook up the voltmeter across the two leads that connect to the window and turn on the system to see if it delivers 12 volts to the window...if so then the connections are either bad or the wires inside the glass are open
check the connections going in to the window leads and also with a test light ,check if their is power at the terminals that plug into the window leads. does your car still have factory warranty that the dealer can look into this.
sounds like a broken grid(the lines across the rear window) or thepower wire has broke off the window
to check this you need some FINE STEEL WOOL
turn the rear defrost on and move the steel wool across the grid not up and down slowly and litely if there is a break in the grid the steel wool will SPARK then mark it keep checking there could be more then one break
then you will need a repair kit
hope this helps
I had the same problem with our 95 aurora, The manual said to turn the temp all the way down and then back up. It worked.. haven't had any heat problems since.. This car is full of problems it seems, I'm about ready to watch this one get crushed.. lolol
there may be a defrost window/ liftgate fuse under dash or in the engine compartment check that first/ you can also check the plug in for the defroster it just pull out and clean with steel wool/ after that if that does not work then the actuall switch is bad switch the button that is/ if you have questions let me know Please rate my response thank you very much
I found this on another site... it seems like a credible post so I thought I'd share... I'm going to check it out next weekend.
"Just an FYI. The rear
defroster issue is due to a bad Antenna Buffer Module / Antenna Module.
The power to the rear defogger goes through a module that separates the
antenna amplifier signal from the 12 volt power to the defogger. The
defogger elements also act as the antenna.The module is behind
the rear pillar right behind the rear passenger door. The inside
plastic has to be gently pulled off, the seat needs to be folded down
to get the lower part of the trim off. One screw at the bottom, unplug
the wires... (two connect to the window grid, mark which one is
which)... and the module is free. The module may require
re-soldering of the pins joining the main power connectors to the
internal circuit board. If you feel you can do this (or have a friend
do it for you), go for it... else get another module from the dealer to
This is the most credible of the several posts that I've seen talking about this module. I know its there... I saw it yesterday when I was working on the car.