cobalt trunk pin
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=93545
Printed Date: June 08, 2024 at 9:32 AM
Topic: cobalt trunk pin
Posted By: mrcanngo
Subject: cobalt trunk pin
Date Posted: May 02, 2007 at 2:28 PM
Hi,
My friend has an 05 cobalt that uses negative door triggers but a positive trunk trigger. Is this possible?
We hooked up the door triggers and they work fine but when measuring the trunk pin located in the BCM c1 pin 55 ORANGE / black wire, it is 0volts when closed and 12volts when opened.
Is there a way to reverse this? I dont think his alarm as the function to change just the trunk pin to a positive trigger. If he does this, all the triggers will become positive.
Thank you.
Replies:
Posted By: xtremej
Date Posted: May 02, 2007 at 3:49 PM
Keep testing ORANGE / black wires in connector c1 at the bcm. Its a negative trigger for the cobalt trunk pin.
Posted By: xtremej
Date Posted: May 02, 2007 at 3:50 PM
Should be in the same connector as the door pins,
Posted By: enice
Date Posted: May 02, 2007 at 4:44 PM
where do you have your multimeter connected? black to ground and red to the ORANGE / black wire? or do you have red to 12v and black to the ORANGE / black wire. If used the first setup then it is a (+) trigger-odd-, but if you did it the other way then it was (-), either way you can convert that positive signal to a negative signal. With a relay you should connect the ORANGE / black wire to 85, (-) to 30 and 86, and 87 to the trunk trigger of the alarm.
Posted By: mrcanngo
Date Posted: May 02, 2007 at 5:56 PM
the flip polarity relay worked like a charm! Thank you. Do i have an odd cobalt because i have a positivly triggered trunk pin?
Posted By: enice
Date Posted: May 02, 2007 at 8:36 PM
Well thats the importance of checking all your wires with a meter. You were lucky that it wasn't an alarm wire that was giving an output(triggers are inputs). Good job checking with a dmm and not just connecting and seeing if it worked. Now, with the odd part, you shouldn't worry, its just how things work sometimes. Again, good job testing.
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