do the 98 - 04 sevilles have a "chip" in the key. In other words an actual something that if you dissected the key you could take out? I think the answer is yes...assuming it is...is the "reader" in the dash? and is read by radio signal...

okay so assuming that is all true. If you took the chip out and taped it to the dash, could you then use any old key cut at the hardware store, and it would always read that chip...thinking every key is driver one or whatever that key was programed as??


like i said just something i was thinking....wondering if anyone knew a definitive answer...

The reader is in the ignition lock cyl area, not "the dash" Wont work!!

does it read by radio though?? or send a signal up the key?

There is a transponder buried in the head (or handle) of the key. The transponder is inactive until the key is inserted in the ignition switch lock mechanism.

Google 'passkey 3'.

i think i found my answer in another thread....it reads the resistance of the key...

....it reads the resistance of the key...

Not so for PK3.

Not 98s and later. VATS (the resistor in the key) was only used thru the 97 model year, after that it has a transponder inside the head of the key, thats why the head of the key is so big.

wrong
VATs was used on the Deville up till the end of 99 and the Eldorado until its end in 2002

There are also Passkey bypass kits that are used with remote start systems. Not sure how they work, but my car will start without a key in the ignition (with the remote start fob). You could get one of those if you really want to bypass that feature.

With remote starts the security system is altered. The car will start. But unless the vehicles actual Passkey is put into the ignition, the car will shut off as soon as its put into drive. The passkey still has to be in the ignition to go anywhere.

With remote starts the security system is altered. The car will start. But unless the vehicles actual Passkey is put into the ignition, the car will shut off as soon as its put into drive. The passkey still has to be in the ignition to go anywhere.


exactly my remote start works awesome! But if i forget as soon as i move the shifter the car dies.

i was kinda trying to figure out how to do a push button start on my 99....also i was reading that with Aston Martins you can buy a watch with a chip in it like the key so as long as you have your watch on your car will start and unlock automatically and all that stuff... so while in dreamland i was hoping i could use the pushbuttons on the fob to unlock the car, then be able to pushbutton start without inserting a key.

That's called a remote start kit. You still need to insert the key before shifting into gear. You're in way-far-out dreamland if you want to try to modify a Cadillac to start and drive without a key - that's a ticket straight to electrical hell.

anyone have a schematic of the starting system....key cylinder and all the electronics involved in security and such....

Factory service manual. The diagrams and diagnostics for those systems alone will fill a small telephone book.

....and take Chubbyranger's advice: fooling with a late Cadillac electrical system and adding aftermarket electronics is a sure way to give yourself ulcers: few people realize that a lot of those simple wires also carry a 1 kHz serial data stream between modules and the PCM, and adding spurious signals and voltages is sure to cause some serious problems. You would not be the first, by a long shot, to learn the hard way. Go down to technical and surf around in the audio section if you want horror stories.

Splice at your own risk..............

My car came with a viper remote start alarm installed... Keyless entry works fine and has much greater range than I think any of the factory systems do. I have a little alarm antenna mounted at the top of my windsheild. The car remote starts fine, with no issues, but whenever I do remote start it I get the "Service Theft System" Message on the dash.

I put the key in it, and it runs fine, and there are no other adverse issues. I've discussed this with my friend who owns a viper alarm dealer and he said that they may have not used the proper bypass in the system. He said if they did not bypass pass key at all, the car would not start, but it may be a situation where the car starts, BUT the ignition cylinder is still complaining that there is no key.

He suggested burying a key head (cutting off the actual metal key) in the dash next to the ignition switch but I didn't that was the best idea, as it would permanently disable pass key.



that is from another thread...

http://www.cadillacforums.com/forums/cadillac-seville-cadillac-eldorado-forum/124376-remote-start-2002-seville-sts.html


okay so this is actually what i was wondering there....how close does the chip in the key need to be to the reader in order to be read???

Hello, it can be done and has been done many times. The last time I talked about this, I got alot of slack from some guy. So all I will say is Email me direct and I can wak you through it easy.

--just post it here, thanks - urbanski

Hello, it can be done and has been done many times. The last time I talked about this, I got alot of slack from some guy. So all I will say is Email me direct and I can wak you through it easy.

--just post it here, thanks - urbanski


i need your email address then......