2002 gmc sierra ultra start 72 series

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=119487
Printed Date: May 28, 2024 at 7:15 PM

Topic: 2002 gmc sierra ultra start 72 series

Posted By: southsidehacker
Subject: 2002 gmc sierra ultra start 72 series
Date Posted: January 20, 2010 at 11:11 AM

Before I start the install on a 2002 gmc sierra I'd like to clarify a few things, i'm using the fortin passlock sl-2 for a bypass module. I've read and heard mixed reviews about using the data-link harness between the remote start and bypass module. Some people say to use it others suggest not to re compatibility issues. How are these normally installed and wired? Also for the door locks, since they are a (+) trigger,is using the outputs from the remote start with a relay to reverse polarity the way this is normally done. I'd like the remote start remote start to function as the factory keyless entry remote does.

Thanks in Advance

Replies:

Posted By: kreg357
Date Posted: January 20, 2010 at 7:52 PM

The Ultra Start 1272 only outputs (-) for lock / unlock. You will have to change the polarity for your trucks positive locks. You will need 2 relays fused at 10 amps. Here is a basic diagram: https://www.the12volt.com/doorlocks/page3.asp#3wp

As for the data harness to the Fortin, I would cut it and just connect the red wire to 12 volts. One less thing to worry about.

I recently did a 2003 Silverado. Fairly easy. The ignition & passlock wires are in the steering column and most of the rest are in the BCM, just below the steering column.

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Soldering is fun!

Posted By: southsidehacker
Date Posted: January 21, 2010 at 12:01 PM

figured it out last night, didn't use the datalink, and used a relay to reverse polarity

thanks