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Security light is on all the time on chevy astro

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The security light is a visual indication that something in the car's security system is failing. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, the car misinterperates this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle.
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Posted on Aug 12, 2013

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Bruce Hathcock

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SOURCE: My 1995 chevy astro van shakes every time i break

you either have bad brake pads or the bolts are loose that hold the front steering suspension on.

Posted on Mar 03, 2010

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