rear windows defrost not working

The_Rebel · 9-5-10, 15:53

Need help fixing this as winter is coming up and i start driving pretty early now..

I've checked the contacts on the back window.. they seem to be doing their job (not sure what readings i should be getting)

I think the main issue is that theres no air blowing on to the window from the vents in the back.. where/how can i check the lines for this? also I've done some research on the subject and found a few posts mentioning a circuit breaker, i have been yet to find any breaker by the fuse box, could someone please post a picture? Thanks guys.

**NickR** · 9-6-10, 11:43

What year car? V6 or I4?

Does the little light on the button come on when you turn on the rear defrost?

Do you get 12 volts between the contacts on the rear window (use a multimeter) when you turn on the rear defrost?

Have you checked the fuses in the box by the driver's knee?

The_Rebel · 9-6-10, 11:45

V6
all the lights come on
yes i get 12 volts
not sure what exactly to check the fuse box for..

Oh RLY · 9-6-10, 11:59

possibly the switch? check that.

The_Rebel · 9-6-10, 12:14

i dont see any switch..

**unamedplaya87** · 9-6-10, 12:52

NickR is referring to the fuse box by you left knee. There is a fuse for the rear defroster. Check that one.
Oh RLY is referring to the actual button that you press on your dash.

msdklze · 9-6-10, 13:13

You also need to check the relay in the trunk. If the MX6 is anything like the GT probe, there will be a little black solenoid back there that clicks when you press the button. You will need to pull off the plastic trunk panel to see it and then check all the connections to it. If its bad, replace it.

If its still clicking when you push the button, check the soldered points where the wire meets the window glass.

**PaulG** · 9-8-10, 17:07

If you get 12 volts at the connector, the grid must have a break in it. DIY: Repairing Your Rear Window Defroster

Oh RLY · 9-9-10, 20:56

My fog lights just stopped working on me one day, totally confused me. I changed them out, changed bulbs, nothing. Ended up being the switch. Odds are though that if the light is coming on that it is working fine.

Do what PaulG is suggesting. Can't hurt right?

(I was unaware that there were vents in the back? I just thought it was the grid itself.)

**PaulG** · 9-10-10, 5:39

Yeah, I don't know about any rear vents either.

goat · 11-16-12, 10:57

All,

I'm going to bump this because my defrost went out this morning, and I know very little about wiring, so I'm hoping somebody can help diagnose it before i bite the bullet and go to a mechanic.

One thing i should mention is that my foglights went out in the summer, and i never did bother to get them fixed. I'm wondering if my switches are done, my fuses are done, or if its just completely coincidental and there are other things going on.

Either way - Can somebody help me figure out what my first step would be to diagnose?
I'm going to read PaulG's link and see what I can find, but i'll post here as well.

93 MX-6
I4 engine

I'll have to check if the lights come on (for the switches) for the fogs and the defrost as i'm not sure

**Justin L** · 11-16-12, 14:44

yup im having same issue... all fuses are OK and it still doesnt work... light goes on and everything.

I hear there is a relayswitch???? location?

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