Question about 1985 Chevrolet Corvette

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1985 corvette vats system w/o chip in key need to bypass

Recently purchased no vats wiring in steering column no chip in key but has red light and vats module will start with start button but not by ignition switch will run about 45 sec. and then shut down then pump shuts off pump starts again about 30 seconds later need bypass instructions

Posted by pplninja on

  • pplninja May 30, 2009

    thanks zyp 1 zyppin along with ya!

  • Anonymous Mar 18, 2014

    lost my keys for my 92 lesabre i meed to put new ignion and bypass vats



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Posted on May 29, 2009


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2 Answers

I have a 92 Oldsmobile Toronado that was recently broken into and my igniton was broke. And now I can't start it. I can put the key in it and turn like usual but the information center is saying starting...

I believe that your key has a resistor chip. You will need to find the resistance of your chip. Once found, go to an electronics store and buy a resistor with the same value. Follow the two wires that go from the ign switch down the steering column , into a 2 wire plug into the ign module. Unplug the connector. Plug the resistor to the module. The module will read this value and allow you to start the car.

Nov 24, 2013 | Cars & Trucks

1 Answer

1989 pontiac firebird was driving car stoped when i tried to start it would not turn over changed the park neuteral switch still did not start. battery is good gauges come on checked the module. can jump...

The security light would come on after making an attempt to start it.
The weak link in the VATS is the ignition lock. It has two small wires and they move when ever the lock cylinder is turned (to on or start...).

You can see where the wires break,

If you have a multi meter you can test it without taking much apart.
Measure the resistance of the chip in the key (touch a test lead to each of the sides of the chip)
Note the resistance.
Remove the trim panel under the drivers side of the dash.
Locate the wires and small black plug,

Unplug it and with the key in the ignition lock (does not need to be turned on or anything) measure the resistance between the two wires at the plug (the wires on the column side both white, black or yellow. Not the wires on the harness side).
The resistance should be the same or very, very close to the resistance of the key chip. If the resistance is too high or infinate then you have a break in those wires (note the top image).

You can cut the wires off the column, solder resistors that equal the keys chip (its actualy a resistor) to the wires and plug that back into the main harness. This is NOT a VATS bypass as many on the net believe. It simply bypasses the weak link, the lock cylinder. The VATS module is still in use. Though with this bypass, there is no security from the VATS (Vehicle Anti Theft System).
Or you can purchase a new lock cylinder. It will come with a key and you will then need to make a copy of the new key but with a blank that has the proper resistance.

If you do go with a new lock cylinder I also did a write up (with images) here not long ago for a person with another 89 that had a bad lock cylinder. You can search for that or let me know and I will write it up again.

Oct 02, 2011 | 1989 Pontiac Firebird

1 Answer

Vats module location 96 buick park ave

Part of the BCM. On mine I got a new lock cylinder and put old chip key in it. Then found the wire to the old one at lower part of steering column and plugged it in . Started car with extra key I had thus by passing the removal of the old lock cylinder. Hid new cylinder with key in it under dash and secured. no more chip keys needed.

Sep 16, 2011 | 1996 Buick Park Avenue

2 Answers

My 1989 Firebird formula 5.0 was driving fine, i parked it and now it wont start. The security light stays on in it as well. I tried putting in and out of gear and nothing no crank at all.

does your key have a black pellet at the base? if so try a new key! must have the pellet in it! if problem is still there after that! the ingition cylinder needs to be replace!

Sep 16, 2011 | 1989 Pontiac Firebird

1 Answer

1st is passlock has shut down my fuelinjection and cant get car to start 2nd I was told to cut the yellow wire on the ignition swich to bypass passlock allowing me to start my car but How do I get the dash...

On a 2002 impala, the switch bypass will not work. The switch bypass originated on the VATS antitheft system which was the predecessor to the system your car has now. Your car has the Passlock system, this system runs off of transponder in your key. On the old Vats system you could read the ohms resistance of the chip in the key, and then recreate that same resistance in the steering column. Thus bypassing the ignition and key. Your system is more complicated. Think about it like this, if a criminal wanted to steal your car, he would rip off the steering column to hot write the ignition. But your car has that anti theft, so it wouldn't start. Wouldn't it be a little too convenient if the Antitheft wires were also right there and all he had to do was twist them together? They learned that lesson on the vats system. Check out this link for info and some "do it yourself" solutions to fix this problem yourself forever.

Sep 10, 2011 | Chevrolet Impala Cars & Trucks

1 Answer

Have had no prior issues with the starter with my 1992 Pontiac Bonneville, but car would not start today. The radio and all gauges came on but engine would not crank. Is there anything else I can try...

Start at the problem. Go to the starter and with a test light, probe the small wire on the solenoid (may be labeled S) while trying to start. If the light comes on then its a bad starter/solenoid.

If no light then make sure the car is in park. Try to start in neutral.

Also if you have VATS (Vehicle Anti Theft System) that could be another issue (any "security" light on?). Is there a small silver "chip" embeded in the key? That would be the resistor for the VATS. The weak link in the VATS is the ignition lock cylinder. There are small wires on it inside the column that will break over time because they move as the key is turned.

A simple web search for VATS bypass should net you some results with diagrams on how to bypass the key resistor. (it is not actually a VATS bypass as the Pass Key module is still in use)

Aug 24, 2011 | 1992 Pontiac Bonneville

3 Answers

Car started an hour ago now wont turn over security light in dash came on and stays on

if the security light is on then it is the VATS system. the ignition switch is fine still.

Aug 15, 2010 | 1995 Chevrolet Camaro

2 Answers

Ignition and key problems...

You have to use the lock cylinder and key from the original column, the keys have a small piece or resistive wire that the sensor in the column reads and if the wrong resistance value is read then the starter or fuel pump are locked out, your car came with a factory security system so don't know why another was added, but the reason above is the problem.

May 14, 2009 | 1997 Buick LeSabre

1 Answer

Ignition - Key seems to not connect when turning to start

had this problem with my 1996 buick regal. the vats ( vehical anti theft system) wire broke in my steering column. you can dissasemble the column and re solder the wire back together or you can find out what ohms the "chip" on your key is. take a voltage meter and put it on the ohms setting. place each of the leads of the tester on opposite sides of the chip on the key. this will tell you the resistance of the chip. go to radio shack and buy a resistor of the same ohms range. around $0.99. look under your dash and find the wires that go to the vats system. i think they are orange. cut these wires and solder the resistor to the wires like an inline fuse(not the wires that go to the column, but the wires that go to the vats computer) this will bypass the system and your car will start and run normally.

Aug 11, 2008 | 1996 Buick Regal Olympic Gold

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