Unlock quit working?
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=65261
Printed Date: September 13, 2025 at 6:27 AM
Topic: Unlock quit working?
Posted By: offroad47
Subject: Unlock quit working?
Date Posted: October 29, 2005 at 8:27 PM
I need a little help figuring out what changed. I installed my DEI 791 in my '01 F-150. The system works fine other than the unlock quit working with the disarm feature. The doors unlock when the engine is shut off and doors lock when the system is armed but when I use the remote to disarm the system the doors do not unlock as before? Any recomendations?
Replies:
Posted By: Alpine Guy
Date Posted: October 30, 2005 at 9:13 AM
You may have to get the brain swapped out for a new one.
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2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Posted By: offroad47
Date Posted: October 30, 2005 at 5:41 PM
The strange thing is the locks did not work this morning but after a short drive the system worked and the doors unlocked when the alarm was disarmed. I left it in the drive for about 2 hours and the locks again did not unlock, What gives?
Posted By: fingaz22
Date Posted: October 30, 2005 at 8:33 PM
have you looked over all your connections? if everything checks out . you may have an intermittin problem in the brain like alpine guy has said. double check all connection. this is a symptom of both problems that i've suggested.
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JUST ONE MORE AMP!!!
hu,alpine cva 1005/dva 5205
sound processor,symmetry(first one).
sub amp,power 1000 the terminator.(1992).
subs,spl comp dual 1 ohms.
punch 150hd on a 10" ev.
alotofhighs
Posted By: JWorm
Date Posted: October 30, 2005 at 8:37 PM
Your locks are falling asleep. If you look in the owners manual for the truck it will tell you how to turn that feature off. It involves hitting the lock/unlock button in a certain sequence.
To test to make sure this is the problem:
Roll down drivers window
Close all windows and arm the alarm
Wait 10 minutes
Reach in window and hit unlock on the drivers door
The doors probably won't unlock
Ford did this for a couple years to prevent thiefs from sticking a coat hanger through the window and hitting the unlock button to let themselves in
Posted By: mo12v
Date Posted: October 30, 2005 at 8:39 PM
Did you have the GEM wire hooked up?
If so, check that connection DoorLock Info: Due To Accessory Power Loss At Generic Electronic Module,Power Door Locks Will Become Inoperable 2 Minutes After Last Door Is Locked And Closed. To wake up the G.E.M Send A Negative Pulse To The YELLOW/BLACK Driver Door Pin Wire With the Unlock Pulse. Diode Isolate Cathode Band Side Of Diode Faces Unlock Triggers.You May Also Get The Wire In The Drivers Door Boot.
------------- MO
Don't Learn from Others Mistakes
You Might Be the One That Knows.
Posted By: offroad47
Date Posted: October 31, 2005 at 6:23 AM
Thanks for the input everyone. I'll take another look this evening and see what I can find. I started the truck with the remote this morning to warm everything up and the locks worked fine this time?
Posted By: JWorm
Date Posted: October 31, 2005 at 9:25 AM
When you turn the ignition on the GEM module wakes back up. That is why the unlock worked when you remote started the truck. As I said above, you can either disable the GEM from shutting off by following the procedure in the truck's owners manual or you can send a disarm pulse to the drivers door pin and set unlock to double pulse like mo12v wrote. Either way will work.
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