1999 grand am door lock problem
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=110399
Printed Date: May 10, 2025 at 8:24 AM
Topic: 1999 grand am door lock problem
Posted By: flipper2882
Subject: 1999 grand am door lock problem
Date Posted: January 06, 2009 at 11:36 AM
Hello, can anyone help me out, installing an alarm in a 99 grand am, pontiac. with the one wire (-) door lock system. it says i need a 1500 ohm resistor for the unlock and i put together the 2 relay pack it shows me with 2 wires going to the one wire and one has a resistor, but when i hit the alarm it doesn't lock the doors or unlock. the wire diagrham says something about where the door lock motors are, but nothing said i had to hook those to something. does anyone know?
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Flipper®
Replies:
Posted By: single slam 12
Date Posted: January 06, 2009 at 2:20 PM
post a pic of how you got it going and diode isolate dont relay it some of these cars are alil tricky but nothing you cant do an post make and model of the alarm you are using will make it a lil easier for the guys on the site to help you.
Posted By: tedmond
Date Posted: January 06, 2009 at 5:18 PM
if the unit has negative lock outputs wire it to two relays like so. Lock relay
85 - lock output from alarm
86 - constant 12v fused at 5amps
87 - ground
30 - to White(-) wire on car @ DKP for lock Unlock Relay
85 - unlock output from unit
86 - constant 12v fused @ 5 amps
87 - ground
30 - to unlock wire White(-) on car with 1500ohm resistor inline.
Posted By: chadwa2003
Date Posted: January 06, 2009 at 7:31 PM
You only need one relay
85 to unlock from alarm
86 to fused 12 volts
87 to ground 1500 ohm resistor inline
87a to lock from alarm
30 to white wire in car
Posted By: mike swanson
Date Posted: January 06, 2009 at 7:37 PM
with 1 wire systems i always hook rite up to the wire with No relays to see if the unit im installing will provide the correct resistance
In most cases it will lock or unlock the door (One or the other)
So then I go about .100 less than what the diagrams says and it all works fine
Then i write this # down for the next car
Easy no relays
Im not at work , but off the top of my head you will need .38 ohm to do lock or unlock and hook direct for the other.
This only works if the unit wont flop the pol. If it does.............. diodes will be needed
Posted By: chadwa2003
Date Posted: January 06, 2009 at 8:51 PM
I got 500 ohm for unlock
Posted By: loneranger
Date Posted: January 07, 2009 at 11:56 PM
single slam 12 wrote:
post a pic of how you got it going and diode isolate dont relay it some of these cars are alil tricky but nothing you cant do an post make and model of the alarm you are using will make it a lil easier for the guys on the site to help you.
Not posting run-on sentences will help too. It makes it much easier for others to read where your thoughts begin and end. Otherwiseit'sjustonelongsentencethatrunsonandonwithnobeginningorendingthoughtanditmakesitverydifficulttoreadepseciallywhenyourtryingtohelpdiagnose.
Posted By: myinstallguy
Date Posted: January 08, 2009 at 8:05 PM
One amp diode with stripe facing alarm connected to unlock wire of alarm. Other side of diode connected to white wire in car. Lock wire from alarm connected directly to white wire in car. No relays. Arm and disarm with all doors closed. An open door might cause the BCM to override a lock command (so you don't get locked out). ------------- *Installer since '89*
Posted By: single slam 12
Date Posted: January 09, 2009 at 10:55 AM
myinstallguy wrote:
One amp diode with stripe facing alarm connected to unlock wire of alarm. Other side of diode connected to white wire in car. Lock wire from alarm connected directly to white wire in car. No relays. Arm and disarm with all doors closed. An open door might cause the BCM to override a lock command (so you don't get locked out).
well dont read what i have to say next time. the guy was waiting for a response which i thought i could have helped him with thats all. anyway this guy made the most out of this. g/l
Posted By: loneranger
Date Posted: January 09, 2009 at 12:01 PM
Lol.. Wrong quote, single slam 12.
Posted By: 73stingray
Date Posted: January 10, 2009 at 2:23 AM
I just wired this up on my 99 grand am. It's a single wire negative pulse system. straight to ground for lock and through a 1500 ohm resistor for unlock. You need to diode isolate the 2 wires if your K/E alternates pos ad neg on its 2 wires. The only relay I added was for the drivers door motor as part of the 2-step unlock.
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