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.
It is tied in with the rear window defrost grid.
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
The 2007 Chevrolet Impala has 57.2 in. of rear hip room.
The 2007 Chevrolet Impala has 37.8 in. of rear head room.
The 2007 Chevrolet Impala has 58.6 in. of rear shoulder room.
The 2007 Chevrolet Impala has 37.6 in. of rear leg room.
It is tied in with the rear window defrost grid.
The rear track of the 2007 Chevrolet Impala is 5 ft. 1.5 in. (61.5 in.).
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.
Yes
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