2002 Concorde rear window defrost dead - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
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post #1 of 41 (permalink) Old 12-04-2015, 11:00 PM Thread Starter
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2002 Concorde rear window defrost dead

Hi

I'm looking for a few thoughts on my rear window defroster not working. I got the car in June and now we're into winter I find no defroster. My first thought is to look at fuses but the manual doesn't seem to mention which one is for the rear window defroster. Does anyone happen to know?

Any other thoughts would be much appreciated.

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post #2 of 41 (permalink) Old 12-04-2015, 11:18 PM
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What type of temperature control do you have? Automatic or Manual.

Does pressing the rear defrost button on either light up the LED indicator?
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post #3 of 41 (permalink) Old 12-05-2015, 08:35 AM Thread Starter
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I'd say it was automatic. You can set the temperature and then it just maintains it. I'm attaching a photo of the controls. Pressing the defrost does light up the LED as you can see in the photo.
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post #4 of 41 (permalink) Old 12-05-2015, 09:04 AM
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Fuse A (in the PDC). It powers only the rear defroster.

Also, there is a relay in the trunk that controls power to the grid - that could have been removed by someone, or be defective.

If you haven't already, you might want to download the '02 FSM and use the schematics for troubleshooting - section 8W. Section 8W also has diagrams showing physical locations of connectors (including that relay). (FYI, the FSM refers to the rear grid as 'defogger' - that might help word searches in the FSM.)

Last edited by peva; 12-05-2015 at 09:16 AM.
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post #5 of 41 (permalink) Old 12-05-2015, 10:13 AM Thread Starter
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Thanks very much for your help PEVA. Sorry to be inept, but can I download the FSM from the site somewhere? I can't seem to locate a link for manuals anywhere..
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post #6 of 41 (permalink) Old 12-05-2015, 11:21 AM Thread Starter
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Hey, found it thanks..
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post #7 of 41 (permalink) Old 12-05-2015, 11:33 AM
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It's fixed or you found the manual?
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post #8 of 41 (permalink) Old 12-05-2015, 11:41 AM Thread Starter
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I found the manual. Looking at the car now..
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post #9 of 41 (permalink) Old 12-05-2015, 12:24 PM Thread Starter
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I took fuse A out of the PDC and it looks fine. Now looking for the relay in the trunk that controls power to the grid. The manual says

"The rear window defogger relay is located in the right rear trunk area behind the carpeting."

so I'm starting to pull away carpeting. I wonder what they mean by "rear". Is that behind the seats or is it next to the light cluster at the opening of the trunk? Anyone happen to know before I pull all the carpet out.. thanks.
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post #10 of 41 (permalink) Old 12-05-2015, 12:29 PM
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It's on the right wall of the trunk right under your antenna. Just pull the carpet down from the top and it should be easy to spot.
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post #11 of 41 (permalink) Old 12-05-2015, 04:04 PM Thread Starter
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OK, I found the relay in the trunk - just underneath the hydraulic support arm for the trunk lid. It does have a relay attached so I took it off and replaced it and it all looked ok.

I went back to the fuse in the PDC and checked it on my multimeter and it seems to be 100 ohms which surprised me. I'd have thought it would be either zero or infinity if it was broken. A friend of mine around the corner has an LHS so I checked his fuse A and it gives an identical reading so I don't think that's the problem. Do relay's ever go wrong?

I bought the car in the summer and live in Nova Scotia so its only now that I've had reason to know if this is working. I did notice that the interior paneling on the back left roof pillar had been pulled away revealing the connector so looks like this may have been a problem for the previous owner.

I checked the resistance across the heated rear window and it was basically zero which is sort of what you'd expect with heat output of voltage squared divided by resistance so for noticeable heat the resistance must be small.. Suggested the heater is intact though.
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post #12 of 41 (permalink) Old 12-05-2015, 04:08 PM
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You could always have a helper enable the rear defrost button on the ATC while you hold a finger on the relay to see if you feel the relay contacts engage with a click. If not then there's a control problem.
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post #13 of 41 (permalink) Old 12-05-2015, 04:35 PM Thread Starter
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Hi Ronbo, sorry, what does ATC stand for?
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post #14 of 41 (permalink) Old 12-05-2015, 04:37 PM
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ATC=Automatic Temperature Control. Your dash controls for Heat and A/C.
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post #15 of 41 (permalink) Old 12-05-2015, 04:41 PM Thread Starter
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Great, thanks, I'll try that out tomorrow. Dark out there now :(
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