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I found this. Your heated mirror also works off that relay. You can do ohms test on the grid, if the grid is open, no continuity. The auto store should sell a product to paint over the open spot to restore continuity, if you can find the open spot.
Not trying to cause trouble, just killing time. Have a good day.
when you push on the rear defroster button does it light up if so then you will have to use a test light and check for broken window grid wires on the rear window. you ground one end of the test light and using the other end start at one side of the window that lights it up then follow the grid line from one side to the other at 2 inch increments, the light should light up but get dimmer as you test the length of the grid, then go to the next grid line and repeat. when the light stops lighting this is were there is a break in the grid is and needs to be repaired. you can get window grid repair kits for this.
check your fuses first,with a test light,then if you have power there take your test light and turn on the rear defroster and probe the wires that connect to the rear defroster in the rear window.if you have power there it is a faulty defroster in the glass
sounds like a broken grid(the lines across the rear window) or thepower wire has broke off the window
to check this you need some FINE STEEL WOOL
turn the rear defrost on and move the steel wool across the grid not up and down slowly and litely if there is a break in the grid the steel wool will SPARK then mark it keep checking there could be more then one break
then you will need a repair kit
hope this helps
1 st of all check all the fuses if all are good it may be the switch itself .......if you are referring to just the defroster ensure both connections are connected to th rear window if there are any breaks in the defroster lines as you will they sell a metal fill type repair kit not expensive and with the use of tape and this mixture you can easily repair the breaks in the defroster lines ........but first ck your fuses and connections maby determine with the use of a test light and check for power at both the switch and the rear wire connections for power to them otherwise it is most likely the switch
I had a similar problem with the blower not shutting off so the dealership replaced the resistor pack under the dashboard.
The blower stopped working several months later and the lights would turn off if you turned the blower to the on position. It was causing a drain on the power so things like the lights and rear defrost did not work. The blower had an internal short and was replaced.