Hey guys,
In relation to problems described in this thread:
http://forums.corvetteforum.com/show...post1564013268

I have questions about how the VATS system operates for a 2001. Specifically, what systems are disabled by VATS? I assume starter solenoid, but what about the ECM, ignition, fuel pump or other systems?
If the fuel pump is disabled by VATS, would it still pump at first turn to ignition (prior to start attempt??) I think I'm still hearing it run for a second or so, but I can't start my car (starter won't engage) and I can't push start it and pop the clutch either..

See link above for full story, but I wanted to post separately with VATS functionality question..

Thanks for your input/help!

 

From the Service Manual:
Vehicle Theft Deterrent (VTD) Description and Operation
PASS-Key System
The personal automotive security system (PASS-Key®) is standard equipment on the vehicle. The system is designed to prevent vehicle theft by disabling the engine unless an ignition key with a specific electrical resistance is used in the ignition cylinder. The PASS-Key® system and the content theft deterrent system operate separately.

There are 15 different ignition key resistance values. Of the 15 different resistance values, or key codes available, only one will work with each body control module (BCM). Once the key code is programmed into the BCM, the code is stored in non-volatile memory.

The PASS-Key® system prevents the engine from starting by controlling the theft deterrent relay and the powertrain control module (PCM) fuel enable input. If the PCM does not sense the proper fuel enable signal, fuel will not be provided to the engine.

If the wrong resistance value is sensed when the ignition switch is in the RUN position, the BCM will not ground the theft deterrent relay control circuit and will not provide the fuel enable signal for approximately three minutes. The engine is prevented from starting and discourages a thief from trying key codes or resistance values at random.

If the correct resistance value is sensed when the ignition switch is in the RUN position, the BCM will ground the theft deterrent relay control circuit and enable fuel delivery. The engine will start normally.

If the PASS-Key® system detects an open or short to ground when the ignition switch is in the RUN position, the BCM will default to fail enable mode. Fail enable occurs when the proper key resistance is sensed before the open short to ground occurs. Fail enable will illuminate the security indicator lamp and allow the operator to stop and start the vehicle until the problem is corrected. The PASS-Key® system includes the following components:

Ignition key
Ignition cylinder
Body control module (BCM)
Theft deterrent relay
Powertrain control module (PCM)
SECURITY indicator
Ignition Key
The ignition key is a typical square ignition key blank with an imbedded resistor. The key blank and resistor are not serviceable separately. There are 15 different resistance values. The ignition key also has mechanical cuts similar to non-PASS-Key® ignition keys.

Ignition Cylinder
The ignition cylinder contains a set of electrical contacts used to measure the resistor in the ignition key. When the ignition key is inserted into the lock cylinder, the resistor in the key makes contact with the electrical contacts inside the ignition cylinder.

Body Control Module
The Body Control Module (BCM) contains the theft deterrent system logic. The BCM reads the key code from the ignition cylinder when the ignition is turned to the START position. If the code is correct, the BCM will enable the theft deterrent relay and will send a fuel enable signal to the PCM via the class 2 serial data circuit.

If the BCM receives the wrong code, the BCM will immediately go into tamper mode. The tamper mode will lock-out the vehicle starter and fuel injectors for 3 minutes. The SECURITY indicator will flash while the BCM is in tamper mode.

Theft Deterrent Relay
The theft deterrent relay is used to prevent the engine from cranking if the correct resistance is not sensed at the ignition key. It prevents the engine from cranking by opening the circuit to the starter solenoid.

Powertrain Control Module
The PCM communicates with the BCM over the Class 2 serial data circuit. When the BCM enters tamper mode, it sends a Class 2 message to the PCM in order to disable the fuel injection system. If the BCM receives the expected ignition code, the BCM sends a class 2 message to the PCM in order to enable the fuel injection system. The PCM then allows the vehicle to start.

SECURITY Indicator
The SECURITY indicator is located on the instrument cluster. The SECURITY indicator is controlled by the BCM via the class 2 serial data circuit.

Bill

 

According to the manual then, the BCM should flash the security light. Mine stays on solid when the key is turned to IGN.

I got some resistors and will try to bypass Monday morning..

Question though, which side of the connector does the resistor go into? One side has purple/white and white/black wire pair while the other side of the connector only has two white wires.. i.e. which side goes to the key cylinder and which side goes to the BCM?

thanks

 

Michael,

How about you ask for these kinds of answers as a PRIVATE MESSAGE rather than a public post.

No disrespect, but I'm getting nervous about how much information (and I'm a guilty party) has been posted recently about how the Corvette SECURITY system works.

I don't mind you're posting the question, but let's try and keep some of the answers somewhat private.

 

No disrespect taken, but quite frankly, it's a public forum and the question is asked publicly because I don't know who might have the answer. Who do you suppose I should PM my specific questions to?

I could go on for about 3 pages about the subject of whether or not any of this really matters if a thief wants your car, but that would be a different subject in and of itself. Please start a new thread if you want to discuss it.

Asking questions and obtaining answers related to security system functionality, in this public forum, are not putting any C5 at greater risk of theft than it already is!

Now, please either add value to this post, or move on.. me, I just want to get my car started back up already..

v/r,
Mike

 

This schematic should help:



Bill

 

Thanks everyone!

It turned out to be the ignition key cylinder doesn't make contact with the key anymore.. I bypassed it for now, the wiring was already hacked anyway from a lousy install on a previous remote starter that I have now ripped out..

I wonder how much a new key cylinder costs.. and can I get one that matches my key cut so I still only have one key for door and ignition?

 

As I recall a new cylinder is around $50.00 and keying it is simple, just transfer the lock pins from your old one.

 

Thanks for the schematic.

Now did chevy build my connectors backwards or is the adaptive performance module built backwards?
The instruction say the terminals male/female opposite but they also claim these wires to be different colors.
Did I get the wrong part? Anyone actually installed one of these things?
Thanks,

 

thanks but I ended up taking the connectors apart and wiring them together.

Basically Chevy made the car end female and the ignition end of two connectors male. Adaptive performance built the bypass with a female end.

They basically wouldn't mate up being both the same connector.

 

Mike I was able to find out what the problem was, turned out to be something with the starter. I just hit it with a hammer and it started working perfectly again. Just wanted to say thanks for the help on the phone, this seems like a great community of corvettes.

 

Glad it wasn’t the turn signal which was broken!