VATS bypass! - Chevy Impala SS Forum
 
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post #1 of 7 (permalink) Old 05-26-2013, 06:00 PM Thread Starter
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VATS bypass!

Hello everyone:

I've read the posts on the PASS key bypass and did the resistor set up beneath the dash to bypass the key resistance. While the car seems to respond a little better, I still have issues with the PASS circuit. I'm thinking it's the module.

If I was to go into the tune and uncheck the VATS constant, would the VATS be bypassed altogether, or will it still give me some problems.

I have TunerCat and can go in to the constant page and uncheck the VATS.

Insight here would be appreciated.

Thank you in advance.

Constantine Pappas
1994 FWB
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post #2 of 7 (permalink) Old 05-27-2013, 01:45 AM Thread Starter
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Can anyone confirm that unchecking the vats constant in the tune can disable the pass circuit all together?

Thanks
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post #3 of 7 (permalink) Old 05-28-2013, 08:48 PM Thread Starter
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OK, so I answered my own question. It turns out that last year when I had my new computer tuned, the VATS was unchecked. I didn't know this, and when I read the PCM yesterday, the VATS constant was unchecked. We still have issues with the VATS, so it appears that even if the VATS constant is unchecked, there will still be issues with it.

It looks like we'll have to bypass the VATS module all together.
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post #4 of 7 (permalink) Old 05-28-2013, 10:58 PM
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The VATS unchecked in the PCM only allows fuel not to be shut off during a security breach. But the VATS itself is still run by the BCM. That is why a resistor matching the resistance in the key has to be wired in.

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post #5 of 7 (permalink) Old 06-08-2013, 07:59 PM Thread Starter
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Quote:
Originally Posted by streetcar2try View Post
The VATS unchecked in the PCM only allows fuel not to be shut off during a security breach. But the VATS itself is still run by the BCM. That is why a resistor matching the resistance in the key has to be wired in.
I see, thanks for the response. I would like to bypass the module all together. Unfortunately, my FSM is missing the electrical portion since it was given to me by an old Cadillac dealer and they completely abused the book.

Any ideas here on how to bypass the VATS all together?

Thanks.
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post #6 of 7 (permalink) Old 06-12-2013, 12:49 PM
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By-Pass The VATS

This is a sticky, that talks about wiring in a by-pass.
PASS KEY II Information (AKA VATS)

Dean Cochran
Dunedin, FL
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post #7 of 7 (permalink) Old 06-15-2013, 04:56 PM Thread Starter
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Quote:
Originally Posted by DeanC24 View Post
This is a sticky, that talks about wiring in a by-pass.
PASS KEY II Information (AKA VATS)
I've already done that and it didn't cure my issue.

Thanks.
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