02 expedition unlock problem

this truck unlocks most of the time just fine but occsionally it doesnt unlock i have checked all the wiring three times the alarm is a two way fm it does disarm but not unlock. could the factory alarm have something to do with it? also the truck occasionally wont let me start it with the key i need to remote start it sometimes i have disconnected the bypass wires and it still does this without it hooked up could the 555 capsule need to be moved?

How were the connections made to the wires from the two  way system ? Solder, crimps or anything ? The system in the Ford is a basic (-) trigger so the only thing I can think of is to use a relay on the UNLOCK wire and boost the signal with it. This will ensure that you are getting a full ground to the wire instead of a 250 mA current.

As far as the PATS, try replacing the system with a keyless module instead.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

The gem module falls asleep. To solve this problem take your factory alarm disarm wire from your aftermarket alarm and connect to factory disarm in the vehicle. Next take the - unlock from the aftermarket brain and split it into three. Diode isolate each of the three wires. One goes to the unlock wire, one to the door ajar, and one to the factory alarm disarm. If you need more help just reply to this post.

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shocker

ss3501968
I am sure that the G E M hookup is noted on your wiring info:

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 BLACK / YELLOW Driver Door Pin Wire With the Unlock Pulse. Diode Isolate Cathode Band Side Of Diode Faces Unlock Triggers. * Ford's G.E.M. May Drop A Low Signal Across The Dome Light And In Most Cases Cause A False Trigger. To Eliminate This Cut the Door Pin Trigger Wires At The G.E.M. And Insert A One-Amp Diode With Band Side Faceing Doors.Make Your Isolated Connection On The Door Pin Side. The GEM (Generic Electronic Module) Is Located Above The Fuse Box.

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MO

Don't Learn from Others Mistakes
You Might Be the One That Knows.

It is because the truck has the "trim switch disable" feature activated. A lot of people talk about sleepy locks and the gem going to sleep etc, but this the real name is "Interior Trim Switch Disable". If you look in your owners manual it in the locks and security section there should be a process on disabling this feature, although it rarely works on expeditions or navigators. (Yes, even though the process is clearly listed in the owners manual, it doesn't work.) Regardless it's worth a try first before anything else. After that all you need to do is run the OEM disarm wire from your module to the yellow/black (sometimes BLACK / YELLOW) door ajar wire in the drivers door jamb boot. You will need to hit unlock twice for the doors to unlock this way, or set your module to double pulse unlock. The reason this problem is "intermittent" is because normally this feature only activates if you lock the doors with a door open. Meaning if you hit the lock switch on the door, and then close the door, you will have this problem. If you hit the lock button on your remote with the door open, you will have this problem. Feel free to go out and test the theory. Put down the drivers window, with the door OPEN, hit lock on the drivers door and close the door. The park lights will flash once. After about 15 - 30 seconds if you listen closely you'll hear a quick click. Now reach in and hit the unlock button on the door switch. It shouldn't do anything no matter how many times you hit it. If all the doors are shut and you hit the lock button, it shouldn't be an issue. If the system is using a door pin for the dome supervision wire, it may cause the truck to think a door is open and activate this feature. This is why I normally use the BLACK/ blue domelight wire on all fords. Technically if you stop locking the doors with the door open, you should never run into this problem. My head hurts.. Good luck,

Mike

i have an easier way to solve the problem... simply set the alarm option to double pulse the unlock. (if that feature is available on your unit)

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"i have an easier way to solve the problem... simply set the alarm option to double pulse the unlock. (if that feature is available on your unit)"

The vehicle doesn't care how many times you pulse that unlock wire it isn't going to do anything unless you hookup the door ajar wire.

Mike

i worked on nothing but fords for two years and have never had a customer bring one back after i double pulsed the unlock maybe i am just lucky

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"i worked on nothing but fords for two years and have never had a customer bring one back after i double pulsed the unlock maybe i am just lucky"

For most Fords, this is not an issue. Also for the ones that it IS an issue, most people close all the doors and then lock the doors, and never run into the problem.

Mike

LOL, Mike you always enlighten me. . .

Regards

EVIL Teken . . .

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Knowledge is power. But only if you apply that knowledge in a positive way, which promotes positive results in others.

EVIL Teken . . .

yeah it is on the f 150 expedition super duty and the explorer as well. I did not think it was on the new (at the time 2002) explorer. i found out about ayear later i finally had one come back. I used the dbl pulse on 150 250 and expedition with no problems. Not that any of this really matters there is one problem and some times multiple solutions. We have given ss multiple solutions for his problem hope they help you out

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Check out directechs fax 1093. I t is for the ford expidition 2002. 03 and up you use a relay and a one amp diode. Or you can try the ignition key trick. turn on, turn off, hit lock unlock three times, turn the key on, turn off, hit unlock three times. The horn should honk if done correct. The dealer has the option to lock out this program feature.

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shocker

"LOL, Mike you always enlighten me. . . "

Glad to hear I'm good for something!


"Or you can try the ignition key trick. turn on, turn off, hit lock unlock three times, turn the key on, turn off, hit unlock three times. The horn should honk if done correct."

Here's the correct procedure:

Turn ignition on: hit unlock switch 3 times
Turn ignition off: hit unlock switch 3 times
Turn ignition on: hit LOCK switch 2 times w/ in 5 seconds

Then you should hear the horn. 2 horn honks means the option is disabled. 2 quick honks followed by another indicates the options is on. Hit the lock switch to toggle between the two. If you get no response (most likely) then it won't work on the vehicle and you will need to look into one of the other options.

Once done turn the ignition off to exit programming..

Mike