Need 12V switched in 2007 Yukon, Escalade
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=89065
Printed Date: May 14, 2024 at 6:40 PM
Topic: Need 12V switched in 2007 Yukon, Escalade
Posted By: porschemaniac
Subject: Need 12V switched in 2007 Yukon, Escalade
Date Posted: January 16, 2007 at 6:12 PM
Anyone know how to grab 12V switched for a radar detector in the new 2007 GM's? I went through every fuse in the fuse block and they are all live with the vehicle off. Help please....
Replies:
Posted By: Mike M2
Date Posted: January 16, 2007 at 6:40 PM
Every wire in the new bodystyle will be either 12volt constant or data. Two things you can do, either run under the hood for power or do like we do and that is use a relay. When we install any video or anything else that requires accessory power we use the brown wire off the igntion switch to throw a relay. The brown wire is only 2 amps so don't use it alone! We power the relay from any fat RED / white in the fuse box....
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Mike M2
Tech Manager
CS Dealer Services
Posted By: rabenoja
Date Posted: January 16, 2007 at 8:12 PM
There is also a pink wire that tests as ignition from the ignition harness. As stated above, I would use a relay to power up any aftermarket accessories.
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Posted By: imseth85
Date Posted: January 16, 2007 at 8:30 PM
Does anyone know if there is an accessory wire behind the radio? Needless to say it would NOT be 12 volts, but a low voltage trigger is inexpensive enough, and I know I've used those on some of the trailblazers that have a 6 volt accessory.
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Seth Alvo NY
Mobile Electronics Installer
Posted By: Mike M2
Date Posted: January 16, 2007 at 9:35 PM
There is no accessory wire on the radio, hasn't been since 2002. The radio is controlled by data link....
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Mike M2
Tech Manager
CS Dealer Services
Posted By: porschemaniac
Date Posted: January 17, 2007 at 11:50 AM
Does anyone have a description of how to easily expose the brown ignition wire in the Yukon XL? Or is there another wire at the BCM that is the same and easily found? Thanks...
Posted By: Mike M2
Date Posted: January 17, 2007 at 5:42 PM
It's easy. pull the knee bolster. There's a 10mm holding the brake release in place and 2 screws on the bottom edge. Remove the fuse box cover. Now pop the bolster off. Look up below the steering wheel shroud and you'll see the harness. Unclip it from the white loop holding it up. Slice open the harness(with the key off!) and you will see the brown wire. It will read 12volts on accessory....
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Mike M2
Tech Manager
CS Dealer Services
Posted By: porschemaniac
Date Posted: January 21, 2007 at 11:53 AM
Mike M2 et al: Thanks a lot for all the help. I pulled the knee bolster just as you said. I haven't cut into the harness bundle yet because there is a brown wire with silver bands that tests for igntion that is running outside the bundle. 
Would this wire be OK? Any idea what the black box is that it travels into? It then exits that black box and goes a few inches to a green plug. Any idea if I should tap one side or the other of the black box for relay trigger voltage? Thanks!
Posted By: Mike M2
Date Posted: January 21, 2007 at 1:26 PM
I don't know what that wire is but i would definately not use it. Look at the white plug above the brown wire in the photo, close to the column shroud. The harness you need is taped to that plug and is above it. Unclip that black plastic clip just above the white wire tie and pull the white plug down. Cut the tape holding it to the harness an slice the harness open. I believe it will be the only solid brown wire in that harness. It's a thin wire...
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Mike M2
Tech Manager
CS Dealer Services
Posted By: porschemaniac
Date Posted: January 21, 2007 at 4:54 PM
Hi. Well, I didn't see your response soon enough and connected to the brown with silver rings. Seems to work great - I made sure the relay was very low current. Let's hope it is not the airbag signal :) The black box that the brown with silver ring wire goes into (see above) says FUSE on the outside so it is powering something. If anyone out there can tell me what the heck I connected to it would be greatly appreciated! If it is harmless I ddon't really want to go back in there! Thanks....
Posted By: porschemaniac
Date Posted: January 25, 2007 at 9:00 AM
Anyone know what I connected to? I sure would appreciate knowing....
Posted By: Mike M2
Date Posted: January 25, 2007 at 4:42 PM
Now you have me curious! I'm doing an Escalade tomarrow, i'm gonna pull the shroud and find out....
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Mike M2
Tech Manager
CS Dealer Services
Posted By: porschemaniac
Date Posted: January 25, 2007 at 4:53 PM
Hey thanks! It sure was easy to use that wire.....
Posted By: wrxsti161
Date Posted: January 26, 2007 at 4:03 PM
i did overhead video in an 07 escalade. Not knowing any better. I just tied directly into a pink switched wire I find in the the driver kick harness running to the rear. 3 months later threw a check engine light. Cadillac technician told me the PCM has to see ZERO volts when the car is off. For whatever reason our over head unit is showing .8 volts with the car off. The technician also told me, going to the ignition harness will cause the same thing. I think I am going to try this brown accessory wire with a relay, then grab thick red out in the engine bay. Any clue how to get into the engine bay through the firewall? Not seeing any easy spots to fish through.
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David
MECP Basic Installer Certification
Posted By: wrxsti161
Date Posted: January 26, 2007 at 4:25 PM
check that, found a place. sometimes you have to open up your eyes a little bit. I'll keep you posted on how this works out.
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David
MECP Basic Installer Certification
Posted By: Mike M2
Date Posted: January 26, 2007 at 5:59 PM
Man we've done literally hundreds of the new bodystyle trucks already, every one got a relay triggered by the brown accessory wire at the switch. Not one has made the check engine light appear. David, your problem is why we use the relay... Porsche, i did two today, an 07 Yukon and an 07 Escalade. Neither one had the brown wire shown in your picture!!! ------------- Mike M2
Tech Manager
CS Dealer Services
Posted By: porschemaniac
Date Posted: January 26, 2007 at 6:37 PM
Mike, Interesting. Thank you very much for checking for me. My vehicle is a Yukon XL Denali with ever option so I wonder what the heck it has that an Escalade doesn't? Maybe the service manager at GMC will help me to track it down.
Posted By: porschemaniac
Date Posted: February 04, 2007 at 10:00 AM
The following is provided as-is: On another thread someone mentioned the following and it seems to work - (much easier to find this wire than to pull off the knee bolster) - Pull off the right side dash end cap (same as the fuse cover on the left side - but pull off the right passenger side). There are three big gray block connectors (the top one may be empty on cars without a lot of accessories). If the top connector is present- tap the yellow wire and test for 12V switched. If the top connector is empty, use the thumb latch to pull out the connector block and tap the yellow wire from the rear. 
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