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Did you check voltage and ground at rear defog connector, purple wire should be voltage, black wire is ground. Check to see what your missing, defog turned on. If you have good voltage and ground, then suspect a break in the defog grid. If you can locate the break, the auto store should have some stuff you can paint over the break to allow continuity for the grid.
Also, you should be able to check grid continuity, ohms test. If no continuity, something wrong with grid.
Here is partial diagram.
First check all fuses, second check for 12v power at the connector to th rear window, a test light or volt meter on dc voltage,if there is power use an ohm meter to check the window grid with the power connector disconnected.if open the connection is either open or bad. if there was no power at the connector check the power from switch all the way back to the window
Check the fuse it should be labeled in the fuse panel as rear def. If its blown replace it and if that doesnt fix it or if the fuse blows again then u have an electrical problem and will need to have a technician look at it.
Couple of things to check - first look for any scratches through lines, a couple of scratches will not let power run from side to side. The other is -> with a test light or voltage meter -> put (+)cable of meter/light to small electrical connector that attached to your window and (-) cable to a good ground (metal) light will come on/meter should read voltage there.
Check for good wiring to the grid.Take the two wires off of the grid and use one end to a load[such as an old headlight bulb or what ever you can find that pulls around 5-10 amps].A test light can be used but it draws no wheres near as much power as the grid does but it will get you started.Put a test lead from each of the grid wires to your load source or test light to see if it works or lights.If the load is dim or turning slow[if all you found was a fan motor or something like that] then you need to find out if it's a bad ground or a corroded power wire.Put the load from the power side to a good ground elsewhere on the vehicle and if it works normally then you have a bad ground.If it still doesnt work like it should then you need to trace the power circuit wiring.This is not brand specific it's just general electrical trouble shooting advise so i hope it help[s you out,a volt meter will show you voltage even if only one strand of wire is still connected so this should be doe when ever electrical problems appear to be normal but still don't work.
Yes there is a relay, but it is part of the hvac control head. There are two fuses in the system one is labled the hvac fuse it's a 10amp and there is a RR defog 30amp fuse. Those supply power to the hvac control head. Control head supplys power to the rear defroster. There should be a purple wire in c3 terminal D on the back of the control head. See if that has power when you turn on the switch. If it dose not then there is not power out put to the rear defroster. If so then the problem lies further down the line.