Visually inspect the heating
grid attached to the inside of the rear window for breaks in the
horizontal lines. Any break in the filaments in the grid will cause a
partial failure of the defroster, leaving a portion of the window fogged
or obscured.
SOURCE: Rear defrost is not working
Take your vehicle to the garage who would inspect the car circuit.
SOURCE: Rear defroster doesn't work.
rear defrosters are an apllied film of semi metalic strips and if you get you windows tinted often the tint man accidentally nicks these strips cuasing the defroster to malfuction check for breaks in the srips
SOURCE: Rear defrost stopped working. All contacts are on
The strips that are attached to the glass that run horizontally always suffer from the age old problem of corrosion. The best way to tell if it is these strips that is causing the problem is to hook up an ohm meter (x10 setting) and check for continuity. If this is good, the relay that feeds the defroster is probably bad or disconnected. This is located under the dash by the fuse box. Check to see if it clicks, and further check to see if you actually get 12v at the contacts back at the back glass. (12-50v setting). If you get 12v and the strips check infinite ohms, problem is, of course, the strips. Best fix is a new glass, but there are kits available that might be able to fix it (various results). Good luck.
SOURCE: rear defroster not working. Defroster light will
Check the defoster fuse on your fuse panel. It is probably blown.
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