Re: rear window defrost not working
Fuse okay? Grid attached to the glass everywhere, but simply no defrosting action at all? Look for a bad switch, relay or timer. For this you’ll need a schematic diagram Start at the fuse and trace the wiring. If the switch is bad, you’ll be able to jumper the switch and get 12 volts beyond there for diagnosis. But you may need to replace the timer—which may be integrated into a larger box of electrical controls buried under the dash.
Your fuse box location is either on the driver's side underneath the dash or behind the battery under the hood. Take the cover off and look, there should be a legend for all the circuits of the car and what they control. If the switch is fine, and the fuse is fine, then it could be at the window where it makes contact, they can break and cause it not to work.
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