defroster/remote start
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=101028
Printed Date: July 06, 2025 at 11:56 PM
Topic: defroster/remote start
Posted By: stroker@techie
Subject: defroster/remote start
Date Posted: January 10, 2008 at 7:37 PM
I have a few vehicles within the next few to put remote starters in. A couple of them want the rear defrost hooked up. Just wondering the best way to hook them up. I am using valet 561r remote start. How do I figure out which wire to use on the defrost switch and does this need any relay,resistor, or need to be diode isolated at all? Thanks Corey
Replies:
Posted By: tedmond
Date Posted: January 10, 2008 at 10:42 PM
got any specific cars? usually testing @ the switch for a latched or pulse is the only way. a relay is best just because the defrost can draw alot of current (to be on the safe side) also, i have never done any cars that used resistors to turn on the defrost. I have seen some that use resistors for blower motor speed, locks ignitin wires etc. no defrost yet.
Posted By: stroker@techie
Date Posted: January 10, 2008 at 11:32 PM
I'm going to be doing a 2005 chrysler 300,2007 Hyundai Sante Fe, 2006 GMC Sierra,and a 04 Trailblazer. And they all want the defrost hooked up. How will I know the difference between latched and pulsed? And how would the relay be wired?
Posted By: brcidd
Date Posted: January 11, 2008 at 7:36 AM
If you use a CAN sl2 bypass module- at least for the GM's- it will do the rear window defrost, the heated seats, the heated mirrors all automatically when the engine temp is below freezing--- a much easier install- most people love the heated seats being on too....it also does the doorlocks and the theft bypass--- it is God's gift to the installer..........
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Brcidd - Engineer That Does Remote Starter Installs on the side.
Posted By: tedmond
Date Posted: January 11, 2008 at 8:57 AM
brcidd is correct. Can SL2 units will do all as he mentioned. and the install time is fairly quick because everything is through the DATA.
Posted By: tedmond
Date Posted: January 11, 2008 at 1:10 PM
i was gonna type somthing up for you, similar but i guess some1 beat me to it ahah. this is Copy and Paste from a member on the forum. brcidd wrote:
latched means the switch is closed until commanded open-- as in holding the button down until I let it off---- or a timer shuts it off- pulsed means the switch is closed and immediately opened- like a door lock switch would do. Defroster switches would "latch" on to keep current flowing to the defrost wires until it times out or is commanded off....
Posted By: stroker@techie
Date Posted: January 11, 2008 at 10:03 PM
thanks alot this will be helpful for future installs for sure. the thing is i already have the bypass modules for the vehicles so i was hoping to be able to usethe output from the remote starter that i am using(561r). For the 2005 chrysler 300 i am using bypass xk532, 06 sierra and 04 trailblazer-xk01,07 santa fe-556uw. so i was wondering if anyone knew what the defrost wire color/locations are for these vehicles?
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