2002 Grand AM Door locks
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=10405
Printed Date: August 01, 2025 at 9:52 PM
Topic: 2002 Grand AM Door locks
Posted By: oolowrideoo
Subject: 2002 Grand AM Door locks
Date Posted: March 04, 2003 at 5:41 AM
As stated in the wiring information "Lock requires a negative trigger, and unlock requires a negative trigger through a 1.5 Kohm resistor. Must use relays..." I'm wondering why I need to use relays, and how I would accomplish this? Thanks in advance for your help
Replies:
Posted By: Mr.Tech
Date Posted: March 04, 2003 at 8:05 AM
For solid Ground and also now most system have - and + triger switching between lock in unlock ...and it won't work
use Two relay ..don't use 87a pins..
both relays 86 goes to (+),30 both relays goes to Ground
85 on both will be going to Brain lock,unlock out put..lock relay 87 goes to lock wire,unlock 87 goes with 1.5K resistor in series to unlock wire in car
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Posted By: oolowrideoo
Date Posted: March 04, 2003 at 8:39 AM
Ok thanks, I think I've got it, but can someone verify what Mr. Tech stated with maybe better English. Thanks again. -------------
Posted By: jrilla
Date Posted: March 04, 2003 at 9:23 AM
Lock requires a negative trigger, and unlock requires a negative trigger through a 1,500 ohm resistor. Must use a relay for the unlock output since it uses a resistor.
So you can just tap the white wire with the negative lock output from your alarm, and then use the negative unlock output to pin 85 of a relay, pin 86 to 12v+, 830 to a 1500 ohm resistor, then to the white wire on the grand am, and 87 to ground.
This is not a big deal but You have to close doors to lock with a single pulse.
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J Rilla
Owner/Installer
Posted By: oolowrideoo
Date Posted: March 04, 2003 at 9:58 AM
Is it necessary to to use a relay for the lock output from the alarm, or just go straight to the white wire? You said basically the same thing as Mr. Tech, but reversed the ground and the lock output from the relay... is there a difference? Jrilla, do you have an email address I can send you a sketch of what I think needs to be done? Again, I thank you and please bear with me. -------------
Posted By: jrilla
Date Posted: March 04, 2003 at 10:21 AM
yes, go to my profile and click the email link.
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J Rilla
Owner/Installer
Posted By: jrilla
Date Posted: March 04, 2003 at 10:30 AM
https://12voltinstallations.8m.com/photo.html Copy and paste this into a new window and look at the diagram in the upper right corner of the page. ------------- J Rilla
Owner/Installer
Posted By: oolowrideoo
Date Posted: March 04, 2003 at 4:58 PM
Thank you so much... That's exactly what I was after.
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Posted By: floaterr
Date Posted: March 05, 2003 at 7:26 AM
Man,
I loved the diagram on the sliding door with single channel. That's awesome.
Posted By: oolowrideoo
Date Posted: March 08, 2003 at 7:16 AM
Ok. I've wired according to the diagram, and my doors will only lock, they will not unlock. Do I need to install diodes anywhere?
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Posted By: jrilla
Date Posted: March 08, 2003 at 7:28 AM
Ypu alarm probably designed to just trigger relays. All of the units i install have relayed or higher current outputs already so I can get away with only one relay or none on the relayed units.
Use another relay for unlock. Wire it the same way as lock but with out the resistor.
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J Rilla
Owner/Installer
Posted By: Velocity Motors
Date Posted: March 08, 2003 at 7:35 AM
Don't you mean that you need the resistor on the UNLOCK wire and no resistor on the LOCK wire ? The UNLOCK wire requires a 1.5K ohm resistor on pin 30 going to the WHITE wire.
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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: jrilla
Date Posted: March 08, 2003 at 7:43 AM
lol, Jeff you should look at my diagram. I must have set it up for those cars that only unlock.
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J Rilla
Owner/Installer
Posted By: Velocity Motors
Date Posted: March 08, 2003 at 8:01 AM
LOL !! Oopps, yeah, looks like anyone who owns a Grand Am has to use their keys to LOCK the doors  ------------- Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: oolowrideoo
Date Posted: March 08, 2003 at 8:06 AM
I have a relay on the unlock, but not on the lock. The lock works fine. I'm wondering what kind of output I should be getting from the unlock after the resistor. I'm still reading -12volts?
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Posted By: jrilla
Date Posted: March 08, 2003 at 8:09 AM
Oh I see. Um your output needs to be negative. What size resistor did you use?
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J Rilla
Owner/Installer
Posted By: jrilla
Date Posted: March 08, 2003 at 8:10 AM
I dont know whay I couldnt edit my last post to add this, but: Make sure you set up the relay like I have diagramed (well except for the double unlock thing, i am going to go fix that now)
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J Rilla
Owner/Installer
Posted By: oolowrideoo
Date Posted: March 08, 2003 at 9:53 AM
The resistor I'm using measures to about 1.47 Kohms, and yes the output is a ground.
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Posted By: jrilla
Date Posted: March 08, 2003 at 9:54 AM
Does the relay click when you press the unlock button?
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J Rilla
Owner/Installer
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