It is annoying when one day the rear window defroster (demister) works and the next not.
Try checking the easy items first. Take a look at the fuse, the location of which is likely shown in the vehicles manual. Check to see if the light comes on when the defroster switch is pushed. When you push the defroster switch you are likely to hear a click as the relay makes.
Assuming these items check out, next take a look at the tabs on the defroster. These tabs are normally located along sides of the defroster and connect the unit to the vehicle’s defrost circuit. A separated tab will stop your defroster cold. If you find a loose or hanging tab use the Frost Fighter Defroster Tab Bonding Kit to reattach the tab.
If the tabs check out as attached to the defroster then check to see if you have power at the defroster tabs. A multi-meter or 12 volt test lamp is handy here. Turn on the defroster and place the probes on each tab. You should see 12-13 volts across the tabs.
If you have power to the tabs it means that the defroster circuit is likely functioning and the fault is in the defroster. We have a good trouble shooting guide online here
Let us know what you find,
Last edited by classicgal93; 19-11-13 at 23:13.
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