2002 Chev,. Cav Back window defroster stopped working

renew the air bags with some from a scrap vehicle ,its that simple

Power window usually don't have a fuse but an automatically resetting breaker. If all four windows stopped working at the same time check the body control module that is what manages the power windows. Good luck.

Most of the time the defroster doesn't work because the frail lines that go across the window get damaged.
On my Chrysler it was painted on the window, and I bought "paint" to repair them.
If yours is the in window type, your screwed.
If there is a break, across the break you'll read battery voltage - 12-14 volts.
From one connection to the other will also read 12-14 volts.
One "tab" has to be positive, and the other has to be negative.
Reading at just some point on the grid will not tell you anything.

First check fuse and relays. If none are bad, check wire connections on back window. Then take a good look at the lines in the window, are any cracked or missing sections? If so, they make a repair kit for this issue. Hope this helps.

there is a break in the defrost lines. should have continuity from one end to the other, but if lines are broken (cracked window, accidentally scraped, etc.) it won't work.

bring to a repair garage

Where is relay and fuse for rear window defrost

if its leaking get that fixed first these seals can be changed but that is a handful . look behind the driverside wheel take off the plastic shield and there should be a plug that takes 3/8 drive or 1/2

If you are in the Detroit area, I could probably recommend a shop. Lots of salvage yards in the area. Probably can get bumper with color of your car. Good luck.

check your coolant level if that is ok check the thermostat