F.A.T.S.

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=12425
Printed Date: July 23, 2025 at 1:07 PM

Topic: F.A.T.S.

Posted By: Patel
Subject: F.A.T.S.
Date Posted: April 19, 2003 at 1:17 PM

Doing some resaerch on Factory Anti Theft Systems.Can anyone provide information on these systems(vats, passlock, passkey, pats, ews, etc.) like when the came out, how they work, just a brief like exert. don't need any info on bypassing them just background info. Or a website a can go to. tried transponderbypass.com/bypasskit.com.More specifically, when did passkey 3 came out.far i have 86 vats, 96 passlock and pats, is this correct?

Replies:

Posted By: CCRoadshop
Date Posted: April 19, 2003 at 8:30 PM

Passkey three is the new fats for chevys and so forth.....

In most fords and chryslers and the new passkey 3 you need to send a frequency up to the factory key cylinder.....(i.e. DEI part number 555u or in some cases 555f) The 555u gets a key locked in a box(which means u lose an extra key) and gets wired into the brain....then a wire gets wrapped around the key cylinder to send the signal to trick the ECU thinkin there is a key in the ignition.....reason for this is becuz the key has a chip in it.

Now passlock/key 1 & 2 take persay a DEI part number 555L which sorta works the same way but in actuality u are taking the factory wires and wiring up a part to interrupt the system....

There are others like Buicks and Lincolns where u need to test the resistance in the actual key and kinda make your own bypass module with a relay.

All pretty much the same idea...but work in different ways depending on manufacture and Key type......Some 2003 model chryslers can sometimes have a chip or sometimes not....

There are 2 cars that I have run into where u can use any of this bypass equipment u actually hafta order a factory ring collar from the manufacture

I found them in BMW's and Mazda 626 and 929's where you go and buy a factory ring collar(the same exact part that sits around the key cylinder and you wire it in the car with an extra key taped inside and leave it under the dash.....this works the same as a 555u but can only be done with the factory collar.

I hope i didnt sound to confusing....all the FATS are just new theft detterent systems so u cant start the car without they key

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Installer - Circuit City Roadshop(2 1/2 years n counting)
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Alpine CDA7894(soon to be the cda9815)
Pioneer XM unit(soon to be direct link alpine)
Audiovox 995C alarm/remote start

Posted By: Patel
Date Posted: April 20, 2003 at 7:31 AM

Thanks for the help so far. have a few more questions.

What is the difference in operation between PASSLOCK I and PASSLOCK II? besides intro date.EWSII was introduced on 95 models, right? was/is there a EWSI/EWSIII and how do the differ in operation from the EWSII(antenna ring and transponder)? When were EWSI/EWSIII introduced?

What type of system do honda use? is it antenna ring and transponder?

Is there any other type of systems besidesvats, passlock/passkey, pats, ews.?

sryy for crazy amounts of questions just what to get everything accurate.

Posted By: CCRoadshop
Date Posted: April 20, 2003 at 8:42 AM

ummm honestly passlock 1 and passlock 2 are quite the same...justpasslock one u need to hook up 1 more wire for it to work(the bulb test wire) I dont knoe the mega difference....

EWS dont differ in operation to tell u the truth

Hondas use the antenna ring and you do lose a key

I dont beleive there are any others.....