02 Yukon Rear Defroster Wiring

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jstoddard

Member - Posts: 4

Joined: December 13, 2018

Posted: January 23, 2019 at 10:14 AM / IP Logged

Does anyone know if there is a wire from the hvac control panel to the bcm that I can send a pulse signal to to turn on the rear defrost or is it all controlled in the panel? I would like it to work the same from the remote start as if the button on the control panel was pushed.

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lurch228

Silver - Posts: 1,338

Joined: August 08, 2012

Posted: January 24, 2019 at 9:47 PM / IP Logged

What you want will require connecting directly to the circuit board for the OEM switch. Mimicking the press of the switch to close the factory connections. Others have done it on here! https://www.the12volt.com/installbay/forum_posts.asp?tid=144319

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mgoetz74

Silver - Posts: 424

This member consistently provides reliable information

Joined: February 15, 2012

Location: United States

Posted: January 30, 2019 at 1:24 PM / IP Logged

the rear defrost and also mirror defrost is just a white wire -latched at the ac controls. should come on 15 seconds after its remote started. Seats are another animal if you don't have a bypass module that turns them automatically

33 years as a installer now just a retired old guy. Favorite thing to install/topic are remote starts/car alarms. Stop using test lights!!!

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jstoddard

Member - Posts: 4

Joined: December 13, 2018

Posted: January 31, 2019 at 6:37 AM / IP Logged

Thanks for the info. I havne't gotten around to it yet, but I'm going to wire it the way lurch228 did in the link posted.

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