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It is located in the SJB smart junction box , it's a fuse / relay center / microprocessor ! Fuse # F2.10 30 amp . location -behind left side dash panel . Also check the accessory relay . Top relay left side , same location SJB .
Visual Inspection Chart
Most rear window defrosters are on a relay not fuse. If I remember right on Corollas it is marked relay (B) near the top above the actual fuses. This is from memory long time ago so I might be off on the marking and location but it usually is a relay.
It's probably not a fuse, but a relay, also called "defogger relay", and it should be in the fusebox you are looking at, or else in the power distribution center by your battery. Often the problem with the defroster is either the connector at rear window, or the little bands, or lines that carry current become scraped and lose continuity.
blinkers sounds like the flasher unit is not working. It's located under dash. Also check for burnt out bulbs.
Rear defrost, or rear defogger?: Your defogger for the rear window would run off a relay, probably located in the fuse panel of your car. Often, the connections at the rear window get broke or disconnected.
Front defrost: does your heater blower work?
It could be a bad rear defroster control switch or relay, it could be a loose or damaged connector somewhere in the defroster circuit, or it could be a damaged or defective defroster grid on your rear window. The easiest way to check to see if you have a circuit problem or a grid problem is to check for voltage at the connectors to the defroster grid at the rear window area. These connectors may even be located inside the trunk just below the rear window. If there is power there, then the circuits are OK and the rear window will most likely have to be replaced to fix it. If there is no power there, then the circuits must be traced to locate the cause of the failure...Most likely a burned-up switch and/or connector.
There are 3 fuses that control the rear defogger, and 1 relay
The fuses are: 10 amp HEATER, 10 amp MIRROR-HEATER; under the dash
The 30 amp DEF fuse is in the fuse box under the hood
The relay is the DEFOGGER relay, which is on the back side of the fuse panel under the dash
Also, check for a loose wire on the defroster grid (on the back glass), this is the most common problem.