Rear defrost switch stays on

Sounds like the diverter door is bound up causing the motor to bog down under load. You'll need a manual for that job. It's a pain in the rear to get to.

The rear defrost has a built in timer in the switch, they can fail and cause this kind of problem.

The rear defro does not have power going to it with the key off. This means there is somehow a short to power to this switch, if you can remove the switch check for power at the connection. If there is power there is a short, I will send you a schematic of the circuit.

have someone ck the wheel bearings,and ck for poss. vacuum leak at upper to lower intake manifold gaskets

I just had the same problem. I have an '04 4Runner and my rear wiper, fluid wash, and defrost stopped working after it was recently serviced. If you had the battery cables disconnected recently here is the solution...Start the engine and lower the rear tailgate window all the way... close the rear window and then turn the engine off. Restart the engine and the wiper,wash, and defrost. should work again. It has something to do with the computer which needs to be rebooted. Good luck.

Hello,
If you armed the security system with the key Fob Transmitter it will stay armed until it is disarmed with the transmitter if the door switch is bad in the latch.
I would try to unlock the doors with your remote transmitter. If this doesnt help try to unlock your rear Trunk/tail gate with the key making sure all doors are closed. If this doesnt work you may need to perform the VTD relearn procedure. Let me know If thats the case Ill give you the instructions you need.

Roy

replce the u-joints.

Check for a loose connection at that fuse panel you were playing with.
I'll check other ideas & get back to you, while you check that.

sounds like a blown fuse

ON THE REAR WINDOW YOU HAVE STRIPS OF RED WIRES BUILT INTO THE REAR WINDOW FOR THE OPERATION OF YOUR REAR DEFROSTS SOUNDS LIKE THERES A BREAK IN THE CIRCUIT YOU CAN BUY A REPAIR KIT FOR IT AT AN AUTOMOTIVE STORE YOU MIGHT BE JUST AS QUICK TO REPLACE THE REAR WINDOW WITH ONE FROM A WRECKING YARD