look in the owners manual for the location of your fuse block. Once found you can find also find a diagram on each fuses location and how to change them
The fuse box is under the hood - the rear defrost should have a fuse, if that does not help - contact your nearest Toyota service or parts department......Mike
Replace turn sigal switch.
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If you are having rear defrost issues, I have a 93 also. There is a rear defrost relay that is constantly going bad. It is located under the driver side dash above the gas pedal. This shiny metal box was the cause of my failure. It may be yours to. There is also a fuse for the rear defrost in the fuse box. Check these and check the contacts out back at the rear window also.
its under the drivers side dash not sure wish one it is but check them all and replace them as needed
The first thing to check would be the fuse. You can find this by looking in the owners manual for your car. It should tell you where the fuse box is and which particular fuse is for the rear defrost. If that turns our to be the problem just replace the fuse, but if it blows again you most likely have bad wiring.
The rear window defogger has a 25 amp fuse in the fuse panel behind the instrument cluster on the left side. Its fuse number 26 in the fuse panel.
Below the dash on the drivers side fuse box. Marked DEF
Click on the link below Click on Owner Guides The owners manual ( which includes the fuse diagrams ) can be viewed online Ford calls the rear defrost the heated backlight
There is no fuse, it is directly connected and when it burns out it destroys the wire harness. Found this out the hard way on my 07 Impala.
RIGHT NEXT TO THE BATTERY IN THE LITTLE BOX WITH FUSE ON TOP OF IT
The rear window defrost/defog heater grid.