Chevrolet 2003 Corvette Bedienungsanleitung PDF herunterladen (Seite 6)

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Ledger Articles - 2007

By Steve Young

VATS Basics

Learning how to understand what the VATS system is saying

The VATS system can only communicate with you by way of a light on the dash or in some cases a text display on the dash.

If you want to be successful, you need to learn how to interpret what the VATS system is trying to tell you. The light on the

dash that the VATS system uses is usually called the “Security Light” because it usually says “SECURITY.” On some cars it

may say “ANTI-THEFT” or just “THEFT.” If you know how to interpret the security light you can tell a lot about what the VATS

system is doing and save yourself a lot of time and trouble. Below is a simple guide to reading the security light.

If the light does not come on – This means that the system is not working. The problem may be a bad connection, bad

wiring or a bad module, but until you get the security light to come on you are wasting your time attempting to interrogate the

vehicle.

If the light comes on and stays on as long as the ignition is turned on – This means that the VATS system is working and

it read the resistor value you tried, but rejected the starting attempt because you did not use the correct value. When you see

this response, you need to turn the switch off and wait at least three minutes before you try another value.

If the light comes on briey and then turns off – This indicates normal operation with the correct key. The car should now

start. If the car does not start, it is not because of the VATS system; begin looking of after-market alarms or other problems.

If the light blinks – This usually indicates that the vehicle has a factory alarm system and that the door is open. If closing the

door causes the light to stop blinking, continue. On some vehicles however, a blinking light with the door closed means the

same as when the light does not come on – see above.

If the light comes on and stays lit even after the ignition is turned off – This feature is not found on many cars, but when

you do nd it you are in luck. The security light on these vehicles acts as a timer for you. When the light goes off, it is time to

try the next value.

VATS Tips and Tricks

The 1990 Corvette was the rst vehicle to have the VATS function built into the main computer module (CCM). Initially this

unit featured a variable time delay, but the feature was phased out before the end of the model year. On these vehicles, the

time delay was slightly less than three minutes for the rst four starting attempts within sixty minutes. After that the delay was

increased to ten minutes per starting attempt.

VATS vehicles that have a manual transmission will not start, even with the correct key, unless the clutch pedal is depressed.

This is why I don’t even try to start these vehicles. I just watch the security light and when I nd the value that causes the light

to go out, I then start the vehicle.

The VATS system can control the ignition, starter, and fuel pump on any given vehicle. All of the systems that are controlled

by the VATS system are disabled when the ignition is turned off. When the VATS system detects the proper key, it activates

these systems. When the VATS system detects an improper starting attempt these systems are already disabled the only

thing activated by the incorrect starting attempt is the time delay on the VATS module itself.

Only turn the key in the ignition once per starting attempt. On some cars, turning the key more than once will add time to the

delay period. The maximum delay period if you turn the key repeatedly is about ten minutes.

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Chevrolet 2003 Corvette Bedienungsanleitung Seite 6