2003 toyota higlander rear defrost

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Forum Name: Vehicle Wiring Information & File Requests
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URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=132809
Printed Date: May 07, 2025 at 7:41 AM

Topic: 2003 toyota higlander rear defrost

Posted By: petejr
Subject: 2003 toyota higlander rear defrost
Date Posted: November 27, 2012 at 5:06 PM

I was hoping to tie my RS to the rear defroster. I have a Viper 5101 and it's got an output for that and can be configured to either pulse or latch when the temperature is below 55F. I'm hoping I could tie it into the existing relay control circuit so the RS would trigger the same existing relay that the factory push button is.

Would anyone know where I might find the wire to tie it into on a 2003 Toyota Highlander?

I did some testing in the factory switch area and did find one possible candidate, but would much rather get some feedback from someone who either knows, or has done it before.

Thanks!

Replies:

Posted By: smokeman1
Date Posted: November 27, 2012 at 5:38 PM

Need to test and verify this source

Rear Defrost

BLUE (-)

AT DEFROST SWITCH

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Posted By: petejr
Date Posted: November 27, 2012 at 9:43 PM

Thanks. I believe that's the wire I had at the connector.

This might be a stretch, but would you have any idea if that circuit requires a pulse or latch? I know the stock system is on a timer, so I'm guessing pulse. Then would the button light up when on via the RS? At least with the light I'd have some indication that it did come on.

Posted By: smokeman1
Date Posted: November 28, 2012 at 5:34 AM

I would have no idea. Always test and verify all wires with a DMM. On my Ford Taurus and Corolla the light comes on for defrost via the R/S.

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Posted By: petejr
Date Posted: November 28, 2012 at 4:27 PM

Thanks again. Maybe that'll get tested out this weekend. After getting the RS in there I'm not in so much of a rush to dive back in....yet. posted_image