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Old 02-12-2003, 05:48 PM   #1
SpaceFrame
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Question Faulty rear defrost switch? I don't think so now!

My rear defrost switch functions intermittently ... mainly, it works in warmer weather when I don't need it.

Anyway, figuring it was a bad switch, I went to the local Saturn dealer and purchased a replacement switch. $55 later, I have a shiny, new-looking switch but still no rear defrost.

Any ideas?

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Old 02-12-2003, 07:13 PM   #2
dancingator
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A Chilton manual will have good electric diagrams to follow. Bennet Auto Supply or Barnes and Nobles. Maybe someplace online to.

Check out your owner's manual to determine which fuses and relays to swap out. Maybe that will help.

And check your connection at the rear window. Maybe its faulty.

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Old 02-12-2003, 09:02 PM   #3
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Actually the switches rarely fail...but then you know that now. Check the connections at the rear grid on either side of the rear window. You CAN safely unplug the slide on connectors if you are CAREFULL to check for corrosion. The other place to check is the chime module which also contains the timer for the rear defroster. It is a plastic box about the size of a deck of cards plugged into the BACK of the in car fuse box. Access it by popping off the cover on the DRIVER's side of the center console and then reaching through to the back of the fuse box from the driver's side.

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Old 02-12-2003, 09:27 PM   #4
sattech
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What year is the car? If '95 or later, When you depress the switch does it stay lit, or does it lite only while you have it depressed.

Do you hear a relay click when you turn the switch on?

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Old 02-12-2003, 11:40 PM   #5
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Default defrost diag

turn on the defroster, use a test light or a volt meter, on the drivers side of the glass you should have battery voltage, as you go down a line of the grid the volts will drop or the test light will get dimmer. If the rear glass is tinted yes you will have to go through the tint to get to the line. by the time you get to the pass. side the test light will not light up or the volts will be very low. that is normal. oh, not to scare you but if you knock off one of those little metal tabs that the wire plugs on, good luck, you have to try to SILVER solder them back on. Normaly we just have to replace the rear glass. $600.00
good luck.

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