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?

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.

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)

"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

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

EVIL Teken . . .