Is it possible to disable the Pass Key feature in GM cars?

Yep.

How?

Some vehicles it is far easier then others. In anycase it is a device that is built into the computer in your car, you could find someone who can reprogram your chip to disable this feature, or you could create a cheater box. For the box you need to know what the signal is that is sent to the computer. Rockcrawl's got one on his site for Caddy COmputers, but I dont know what engine you are trying to cheat.

Anyways, good luck! There is people on the forum with experience with this kind of thing. You could try contacting one of them who has already done a swap, I think gen II 3.8SC's and probley 3.8 NA have one, and northstars, and 4.x engine computers use one.

Later

On what?

1990 buick riviera 3800 N/A.I cannot for the life of me get this thing to turn over.There is a chip in the key that usually makes a (security} light come on then you can start the car.Now the security light does not come on at all (impossible to start the car)

What's the four letters from the top of the mem-cal? Problem is, you're in Canada and I'm in California.

I can tell you what to have someone change if you know someone with a burner.

TK

quote Originally posted by Santa Cruzer: 1990 buick riviera 3800 N/A.I cannot for the life of me get this thing to turn over.There is a chip in the key that usually makes a (security} light come on then you can start the car.Now the security light does not come on at all (impossible to start the car)

Sounds like your existing VATS module is dead, or the key resister circuit is no longer sending the correct resistance signal to the VATS module.

A dummy module or chip reprogram is not your only problem. I believe your vehicle also has a starter interrupt relay in addition to the fuel enable signal that is part of the PASS-KEY system. You will need to track down this relay (easy, it has a couple yellow wires going to it) and bypass that, as well as build a VATS bypass circuit to passify the ECM.

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Fiero-related Conversions Performed:

1985 SE 3800 Series 1 SC 4T60-E
1987 Coupe 3800 Series II 4T60-E
1987 SE 3.4 TDC 5-speed
1984 Coupe SBC V8 non-OD to 4T60 OD swap
1985 Coupe 3800 Series II Supercharged (under construction)

http://dtcc.cz28.com

[This message has been edited by Darth Fiero (edited 02-28-2003).]

What usually goes bad with the VATS system is the wires break at the lock cylinder in the collumn. It would be best to replace the cylinder but if you just want to bypass it all you have to do is take an OHM reading across the chip in the key, it is just a resister. Go to Radio Shack and get a resistor to match the correct resistance. Disconect the connector under the dash that goes to the cylinder. Hook up the resister inline to the vehicle wires. The resistors are now replacing the key resistor. If that is what is wrong with your car it will start.

You can also test the system the same way. Take a reading at the key. Then take a reading under the dash through the cylinder and key, you will quickly know if that is the trouble.

quote Originally posted by Santa Cruzer: Is it possible to disable the Pass Key feature in GM cars?

Yup! I'll tell you how I did it on my machine, but I don't know whether it'll work on your particular donor.

On the '95 Firebird/Camaro, ( where I got my motor) there is a resistor in the ignition key. When you plunge the key in the ignition switch, it completes a circuit that sends a 50HZ square wave from the pass-key module to the ECU, which turns on the injectors and enables the fuel pump.

To circumvent the pass-key module, simply build a 50HZ square wave generator that'll supply a signal to the ECU when the ignition key is in the "on" position. Any high school/ Junior college electronics student should be able to whip you one out. If it wasn't dark as the Hubs of Hell and I hadn't had too much applejack, I'd hunt up the thingy I built for my '77 924 Porsche, whut has a '95 Fireburd motor in it.

After reading the other answers to your post I agree that if you have the original ignition key to your donor car, then measure the resistance across the key and simply solder the proper resistor across the two wires that go to the contacts in the ignition switch.

BUT...

If you're like most of us who buy an "engine changeout" (to use the words of my local salvage yard) then you don't have any idea where the original ignition switch is, or the original car is, for that matter.

Like I said, I'll e-mail you in the morning.

[This message has been edited by Jim Gregory (edited 02-28-2003).]

[This message has been edited by Jim Gregory (edited 02-28-2003).]

[This message has been edited by Jim Gregory (edited 02-28-2003).]

http://fp.enter.net/~rockcrawl/passkey.html