Rear Defrost for Chevrolet

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=46894
Printed Date: July 21, 2025 at 4:41 AM

Topic: Rear Defrost for Chevrolet

Posted By: FairWeather
Subject: Rear Defrost for Chevrolet
Date Posted: January 04, 2005 at 3:25 PM

Anyone have an idea on how and where to hook up the rear defrost on late model Chevrolet / Chevy trucks and SUVs? I've had 3 people ask for that feature but I am scared to go fooling around directly with the climate controls. I was hoping to catch this feature someplace else. If you could talk me through it, I would appreciate it. I've had requests for the following vehicles:

2003 Trailblazer LT and LT EXT
2004 Tahoe Z71
2005 Avalanche LT Z71

Thanks everyone for at least reading it over

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You can do it!

Replies:

Posted By: sparkie
Date Posted: January 04, 2005 at 6:27 PM

Some maufacturers claim that their data interfaces may do this, but I have never confirmed this. The best way to do this is to use the starter to activate a relay which will duplicate hitting the defrost button or switch. This involves soldering wires on the switch contacts inside the heater controls directly on the circuit board. It can be done but, not quickly.

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sparky

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