Rear window demister stopped working. Fuse is fine. Any other suggestions?

[SamSta Member Find all posts View Profile Close SamSta]

Subject says it all!

[ptommo59 Senior Member Find all posts View Profile Close ptommo59]

The element in the window can fail, see if you are getting 12V across the terminals on the window with the ignition and rear defog switch on.

If yes, then that's you problem

If no, you have a problem somewhere from the fuse to the window so check for power at the switch and go either way from there.

Edit: Don't have a 90 wiring diagram but the 120 version also has a Defogger Relay that provides power to the fuse and this is also listed as the R4 relay at the back of the 90 passenger compartment fuse box Fuse Box Diagram Toyota Land Cruiser Prado 90 (1996-2002) (fuse-box.info) so may also be worth checking for 12V at that point.

[SamSta Member Find all posts View Profile Close SamSta]

The element in the window can fail, see if you are getting 12V across the terminals on the window with the ignition and rear defog switch on.

If yes, then that's you problem

If no, you have a problem somewhere from the fuse to the window so check for power at the switch and go either way from there.

Edit: Don't have a 90 wiring diagram but the 120 version also has a Defogger Relay that provides power to the fuse and this is also listed as the R4 relay at the back of the 90 passenger compartment fuse box Fuse Box Diagram Toyota Land Cruiser Prado 90 (1996-2002) (fuse-box.info) so may also be worth checking for 12V at that point.

Ahh good info! I think I tested the back window soldered points and couldnt get a voltage reading from them (this was a while ago - I am revisiting this). As mentioned the fuse is fine. I don't think the switch lights up anymore so maybe there is a problem with the switch. I'll have a look again over the weekend. Thanks for the suggestions mate! Appreciated!