2004 Blazer: want to trigger rear defrost

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=41352
Printed Date: June 26, 2025 at 10:55 AM

Topic: 2004 Blazer: want to trigger rear defrost

Posted By: chuck1026
Subject: 2004 Blazer: want to trigger rear defrost
Date Posted: October 21, 2004 at 7:31 AM

My Autocommand remote starter has a (-) pulse output that I would like to use to trigger my 2004 Blazer's electric defroster grid timer switch. I am not sure if (or where) I can connect into (the BCM or defroster switch) to do this. I haven't found a good wiring chart or schematic that helps either.

Any ideas? It sure would be nice to have the mirrors and rear window clear while the truck warms up!

Replies:

Posted By: DAVE WALKER
Date Posted: October 21, 2004 at 4:50 PM

Chuck,

dont know if this will help, but if you can find the relay that works your heater, you are half way there. Connect the (-) wire from your starter to the side of the relay that comes from the heater switch.

Sorry cant be more specific, but in UK, dont have blazers !!!!!

Dave.

Posted By: chuck1026
Date Posted: October 22, 2004 at 7:59 AM

Thanks. I have asked guys on another site where the elusive relay may be hiding. Hopefully somebody here (or there) will chime in with that info.

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