View Full Version : Trying to disable VATS, what resistor?

06-05-05, 10:43 PM
Hi, I'm trying to disable the VATS system on my 1991 Seville because I don't want to pay $200 for some new keys. I've came to the conclusion that I need to solder a resistor into one of two white wires on the steering column. The resistor needs to have the same Ohm reading as the VATS chips on my keys to trick the VATS ECM? into thinking that everything is fine. I think I need to do the above because both of my keys will not start the car, thus it is the locking cylinder that is malfunctioning which would require $200 in parts/labor. My question is this: the guy at RadioShack used a multi-meter (I don't have one) to measure the value from the key and said it was 1.8Ghz, which equates to 1800K Ohm by his math. Is this correct? Is that value even one of the 15 that are used for the VATS system? And finally, where would I find a suitable 1800K resistor?

Thanks for any help in advance.

06-06-05, 12:52 AM

Your description makes no sense! GHz are units of frequency and not resistance! The Rad Shack guy was pulling your leg (or had no clue)!

While I don't remember exactly, the VATS resistor values are in much lover range than 1800K ohms (1.8Mohms). It should be something like 5-10K ohms range.

This is not a rocket science. Find any simple multimeter and put it in "ohm" or "resistance" range. Most are autoranging for the actual value.

Then place each test lead on the metal tabs in the VATS pill. Don't touch anything with your fingers and don't get the leads to touch the metal part of the actual key.

It will give you the reading you are looking for. Then just buy a resistor that is close to the ohm value (1/4 Watt or higher power).

If you are planning on working on your car, buy yourself a cheap multimeter (probably around 20 bucks). If not, find another RadioShack or visit the electronic lab in your local school.


06-06-05, 03:19 AM
The VATS ranges are from 392ohms to 11,800ohms or 11.8kohms. Adding a few different value resistors in series should get you almost exactly what you measure on your key. If you want to maintain the VATS security feature, you can hook up a relay with the resistor. Check this out for added info: http://www.designtech-intl.com/Content/techsupport/documents/section04/note237.pdf

The Ape Man
06-06-05, 01:24 PM
How about using a precision multi turn pot?

06-07-05, 12:48 AM
Okay, so I went to a different Radio Shack and tested it myself. It was 1.87K on the pellet, so I grabbed a 1.5K and a 330 Ohm resistor for a total of 1.83K (the closest I could get). I soldered them together, found the orange wire containg the two white wires, cut one, and taped the resistors in with electrical tape and the screen still says:
STARTING DISABLED DUE TO THEFT DETERENT SYSTEM, WAIT 3 MINUTES yada yada yada. I've never soldered resistors together before, is there a certain way the need to be arranged regarding the colored lines on them.

By the way, are there specific fuses for this system (where are they located)? Or anything else I should look at or check?

The Ape Man
06-07-05, 10:20 AM
You put them in series and not parallel right?

06-07-05, 02:40 PM
Im assuming series is in a line? (I googled but couldn't find pictures/diagrams)

I soldered them in a line like this:

1.5K 330

Is there a certain way the resistor have to be arranged according to their...heads? I guess I would say. And which side is actually the head/front?

Would any of these be correct?

1. Ignition cylinder-----{[[[[-----solder-----{[[[[-----
2. Ignition cylinder-----]]]]}-----solder-----{[[[[-----
3. Ignition cylinder-----]]]]}-----solder-----]]]]}-----
4. Ignition cylinder-----{[[[[-----solder-----]]]]}-----

06-07-05, 11:36 PM
You soldered them correctly. Resistors are not polarized or directional.
I think the value you have shoudl be close enough to make VATS work ok.

I cant help you in the resto of the bypass procedure as I don't have wiring diagram handy.

IIRC< there shoudl be 2 wires which connect to the contacts in the lock cylinder.

You need to disconnect those wires from the cylinder and place the "bypass" resistor across them.

I'll call the wires which came from the cylinder contact circuit A and B.

A...............................RESISTOR.......... .........RESISTOR................................. B



06-08-05, 12:47 AM

just go get yourself 2 copies of the key with the regular, non-pellet blanks and solder the pelleted key inline with the 2 wires in the brown or violet (don't remember right now) plastic sheath. DO NOT TOUCH ANY WIRES IN YELLOW !!!!

cut the 2 small wires and connect the ends that go to the bottom of the steering column.

p.s. to make in easier, tin the small wires first and then solder them to the pellet, one on each side.

08-28-05, 02:44 PM
You have the resistors connected together correctly but it sounds like you are connecting them incorrectly to the wiring. Cut the orange wire harness about 3 inches from the large connector. Strip about 1/2 inch of insulation from the ends and solder or crimp the reistor so that it bridges between positions 12 and 13 on the large connector. The resistor should be the only thing connected. Do not reconnect the wiring that goes to the ignition switch. The engine should now start when you turn the key. Insulate and tie wrap the resistor. I tie wraped the resistor to some of the other wires to keep it from flopping around.

04-28-06, 08:24 PM
Hey, everyone this is 91seville. I couldn't remember the password so Im now Noya. Anyway, I ended up having a mechanic come look at the car and he got it running. It started doing the same stuff and has been sitting for 3 months. I bought a Jeep. I really want to fix it and sell it since its just been sitting. Here are a couple of pics of Orange wires. One is from the ignition, the other is in front of the center console. Could someone maybe Paintshop and show exactly where to place the resistors?

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http://server3.pictiger.com/img/261544/computers-and-electronic-gadgets/picture-001-small.php] (http://server3.pictiger.com/img/261544/computers-and-electronic-gadgets/picture-001-small.php%5D)http://%5BURL=http://server3.pictiger.com/img/261544/computers-and-electronic-gadgets/picture-001-small.php%5D%5BIMG%5Dhttp://images3.pictiger.com/thumbs/ba/b7bd23177bd6cfc4bd4309fe6cc6acba.th.jpg%5B/IMG%5D%5B/URL%5D