Newer VATS Vehicles

[peter paul fenske]

At 10:42 PM 8/26/96 EST, you wrote:
>More and more GM vehicles are using VATS. The newer units are still a
>separate module, but the frequency is now 50 Hz. It can still be defeated by
>either using the original module with the key resistance just soldered in
>with a fixed resistor,   making a VATS module with a 555 timer, or changing
>the bit in the EPROM from VATS to NO VATS.
>
>
>        John Spears
> Speartech F. I. Systems
Hi all
The above is true for all GM vehicles except!!! new vettes.
In this beast the CCM does a measure of the key resistance and then
this info is sent to the ECM via common serial data line.

FYI info the key resistance is in fifteen values ranging from 394 to
12,036 ohms. This translate to codes between 0 - 255 in the ECM

Mind you normal people with F bodies don't have to worry. Just
the unfortunates trying to tangle with vettes.

Also simply disabling the VATS bit in the eprom doesn't always work.
You also have to disable the error code mask if you don't want a 
Vats error.

GL : peter