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Theft light blinking

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Old Aug 2, 2012 | 09:39 PM
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teamlx88
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Theft light blinking

The other day I noticed that the theft light was blinking on my 98 Expy. It was flashing a code 16. Ever since I bought this truck the anti theft has not worked properly.
1. The light doesnt blink after the truck has been shut off
2. I can start the truck with a blank (no PATS chip) key
3. The alarm doesnt go off if I open the door

A while back I was putting in new headlight lenses and I took the ground wires off of the drivers side radiator support. Immediately after I heard a very light buzzing coming from the engine compartment on the drivers side. When I looked inside the truck I noticed the theft light flashing and when I opened the door the alarm went off (headlights flashing, horn sounding). And now after all this time I get a code 16.

Anyone got an idea here? Im totally lost.
 
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Old Aug 3, 2012 | 05:03 AM
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Does this vehicle have any type of remote start or after-market security system?
 
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Old Aug 3, 2012 | 08:53 AM
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