2001 Sequoia rear defrost trigger?
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=64717
Printed Date: May 16, 2024 at 6:26 AM
Topic: 2001 Sequoia rear defrost trigger?
Posted By: furious440
Subject: 2001 Sequoia rear defrost trigger?
Date Posted: October 20, 2005 at 8:59 AM
Hi anybody! I wondered if anyone on this board has a good meathod for triggering the rear defrost on a Sequoia? I assume I will just need to find the wire that activates the factory relay and pulse it. Or is it more involved than that? Thanks for the post and to all who reply!
Replies:
Posted By: thepencil
Date Posted: October 20, 2005 at 11:38 AM
Normally, a diode to the ground out when running is all that that will be use in combination with the Accessroy wire to activate the defrost. ------------- Be careful whose advice you buy, but be patient with those who supply it. 
Posted By: kgerry
Date Posted: October 20, 2005 at 2:30 PM
you'll have to determine the polarity of the circuit, as well as whether it's a pulsed or latched circuit... many RS units today have a dedicated defroster output that is programmable....
-------------
Kevin Gerry
Certified Electronics Technician
MECP First Class Installer
Owner/Installer
Classic Car Audio
since 1979
Posted By: furious440
Date Posted: October 20, 2005 at 7:22 PM
Thanks for everyone! I just looked at the Toyota wiring diagram and I will use the latched output from my remote start. And I will use a diode to isolate. However, I wish I could activate the front defrost as well. This vehicle has auto climate with one touch front defrost. Unfortunately, it is all multiplex communications and no switch that I can directly connect to.
Posted By: thepencil
Date Posted: October 20, 2005 at 8:36 PM
Is there not a fan for the front windshield which will do that? ------------- Be careful whose advice you buy, but be patient with those who supply it.
Posted By: furious440
Date Posted: October 21, 2005 at 1:44 PM
Yes, there is of course the blower for the front. I just wish there was a way to activate the front defrost (e.g. heat on high, fan on high, DEF vents) by remote.
Posted By: Chris Luongo
Date Posted: October 22, 2005 at 7:32 AM
As a compromise, for the front defrost, you might do this:
First, set the climate controls to Auto, and set the temperature the way you want it.
Next, hit the button that changes where the air comes out----set it so that it comes out the heater and defroster vents at the same time.
As long as you don't touch anything else, the system will still regulate the fan speed and air temperature automatically, so you'll always be comfortable...... but when you remote start, some air will reach the windshield and warm it.
Posted By: furious440
Date Posted: October 22, 2005 at 3:52 PM
Well, I am already used to presetting the climate controls but I think I'm going to go for it and see what mods I can make to HVAC contol panel circuit board aka A/C amplifier. BTW: Thanks Chris Luongo for your previous posts on the Sequoia. Very helpful!!
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