04 rear defroster circuit breaker

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04 rear defroster circuit breaker

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04 rear defroster circuit breaker - 3/24/2008 5:52:48 PM

spectre184

Posts: 3
Joined: 3/24/2008
Status: offline

Hi all 1st post here

Anyway,

I'm pulling my hair out on this one. I have a 2004 Impala, just plain jain nothing fancy. My rear defroster doesnt work. I got print out (see below) and it says there should be 30amp breaker on passenger side. owners manuel says same thing. But when I look all I see is connector block for that fuse block?

I replaced the relay and I get 12v all time from engine compartment. But when I measure at plug ins in rear window I get nothing. Yes I tried going to ground and across each other and any possible combo (I have extensive electronics back ground, automotive, mechanical, well.... it's getting better)

[URL=http://www.putfile.com/pic/7877612]

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Underneath grey cover on right side looks like connectors for wires to fuse box. I tried to take it off but I unscrewed that screw and it still didnt come all way off and I was afraid to pull to hard and break something. Or should I?
Like I mentioned in above I have no idea where that breaker is.

I'm wanting to see if I'm getting voltage to breaker. then go from there.....

Also what is 'radio antennna module (on upper left portion of left "C" Piller)'? I see this and it has printed circuit board and 3 wires going into it. See wire diagram below.

click on pic for larger view. after you click on it, lower right corner of pic it says 'full view'. click that

[URL=http://www.putfile.com/pic/7877928]

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Thanks for any help

Post #: 1

RE: 04 rear defroster circuit breaker - 3/24/2008 7:38:12 PM

shawnvw

Posts: 911
Joined: 1/18/2008
Status: online

If you check the green wire at the antenna module for power when the defogger is on it should give you an idea if power is being delivered to the rear. If there is power back there, and as long as your ground is good, then you will be looking at a new antenna module.
As far as i can tell, the circuit breaker is underneath that grey cover on the right side of the fuse box. There is a 30amp power seat breaker near the center, and a 30 amp breaker for the rear wiondow defogger towards the bottom.

The radio's antenna is a grid on the rear window. The signal need to be amplified so the radio can pick up station like it would with a fixed mast antenna. Hence the reason for the antenna module. Why they integrated the defogger circuit with it is beyond me

(in reply to spectre184)

Post #: 2

RE: 04 rear defroster circuit breaker - 3/25/2008 12:15:31 PM

spectre184

Posts: 3
Joined: 3/24/2008
Status: offline

I found out where breaker should go but 1st...

Like I mentioned above under grey cover is terminal block:

Then I was able to get it all the way off to see what's nderneath:

But I did find where breaker should be on back side. I had to take out glove box. But there was only one breaker! The one for the power seats. I see contacts for other stuff. I tried to test for voltage but I need better adaptor. My leads wouldnt fit in and I tried wire but I dont think I'm getting good contact. None of the numbers matched up on schematic to panel either. There are like 5 contacts but 3 are in a row and you can't use 2 because of the power seat breaker.

So I go to local autoparts store and they show nothing for breaker

But, my neighbor has an 04 Impala and I'm going to see if they will let me look at theirs.

Also on the radio board in back there are 3 wires going to it and all same color, black. Must be junction in rear piller but I'lll worry about that later if need be.

(in reply to spectre184)

Post #: 3

RE: 04 rear defroster circuit breaker - 3/25/2008 1:26:18 PM

shawnvw

Posts: 911
Joined: 1/18/2008
Status: online

Have you checked fro power on the green wire at the antenna module?

Also, you said you had a plain jane model...do you even have power seats?

(in reply to spectre184)

Post #: 4

RE: 04 rear defroster circuit breaker - 3/25/2008 5:26:17 PM

spectre184

Posts: 3
Joined: 3/24/2008
Status: offline

I went and looked at my nieghbors and saw where there breaker is. Mine is missing! It should be lower right corner when looking at it from under dash. It's hidden my metal bracket and I didnt see the contacts as it's a PITA to get to. But I'll get it, I have an idea

Like I mentioned above for the antenna module there is no green wire as there are 3 wires attached to it and all colored black. I'm not sure what other 2 are unless I get radio schematic. But I dont need to yet since I have no circuit breaker.

Yes I have plain jane model but I do have power seats and I took that breaker out and seats didnt work so i know what it does..

< Message edited by spectre184 -- 3/25/2008 5:27:48 PM >

(in reply to shawnvw)

Post #: 5

RE: 04 rear defroster circuit breaker - 3/25/2008 6:41:36 PM

shawnvw

Posts: 911
Joined: 1/18/2008
Status: online

sounds like you have it narrowed down then. CB's are fairly cheap to buy, I think around $15-20

(in reply to spectre184)

Post #: 6