You dont need a module to bypass your vats. All you need to do is measure the reistance of the chip in your key. Then make up a set of reistors to equal the resistance in your key. Then drop the lower panels of your dash and locate the ignition harness. In the ignition harness there will be a two wires in an orange loom.(theese wires are very small guage) cut the two wires and but connect the resistors that you have made up to the two wires going away from the key cylinder. If done right you have just now bypassed your vats. There is also another way to do it with a relay, but would take a long time to describe.

 

The resistors are not standard EIA values. The best bet is to use a 10 or 20 turn potentiometer and set it to the value of the key pellet resistor. Also you cannot simply bypass the VATS with a relay. Fuel pump and injector operation is controlled also by the VATS in conjunction with the ECM. Failure of the square wave signal to be present at the ECM from the VATS module will not let the car run even if the crank relay is bypassed.

 

No they are not, but you can use several reistors in series to get it close enough. You can do the same thing with a relay using your igniton to activate the relay with the resistors in series with ir also. Yes the vats controls the fuel pump but where i stated tags it before the module so that it still thinks that everything is alright. I know this because i am an MECP certified installer and do this every day to install remote starts.

 

Yep, bypassing vats only when the remote starter is active is the proper way to wire a remote starter into a thirdgen.

But if you watch the threads here, you'll also find that the resistor contacts in the ignition lock will cause a nostart when they fail. Since many of the members here are on very tight budgets and cannot afford to spend the ~$250 at the dealer to replace the worn out ignition lock, many have permanetly bypassed vats.

 

I am not questioning your ability, only the way it was put. What you are stating is not a "bypass" per se. You are only replacing the key with a fixed resistor. The VATS cannot be bypassed unless the prom is edited or an oscillator is built to simulate the signal the ECM recieves from the VATS module after the pellet is recognized. Thats what is confusing to many people when they try to get around it because of a bad ign cyl, or defective module. Also, getting the resistance as close as possible is desireable. The module has a tolerance for resistance variation, however underdash temp in hot weather causes some component drift within the module. I did a key bypass for a friend of mine a couple of years ago. The pellet was 880 ohms and I used an 820 ohm1/4 watt fixed resistor. All was well till she called me up on a 105 degree day and told me it failed to crank. After it cooled down she got it to start. Replaced the resistor with a precision pot adjusted to the exact resistance of the key and it's been fine since. Whether it was a module problem or the variation of the key resistance is anybodys guess since I have never seen a data sheet on the module and probably never will.