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1996 Eldorado wont start due to Anti theft issue

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So im posting this for my dad, It was running great and was his everyday car until he took his truck up camping or something and the cadillac sat for a bit and I guess the battery died and they had to move it so they would have more room in the drive way, so he put it in neutral and pushed it forward a bit. later on he wanted to start driving it again so he went to go start it after it sat on the charger for a couple hours and the accessories will turn on and everything but when he tries to start it then it wont turn over and noticed that the security light is on and will stay on as long as the key in in the on position. we know that is isnt the starter. and we are wondering if there is any way to turn off the security or by-pass it without taking it to the shop. thanks

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I would first check or codes and post them here.

Then I would disconnect the battery for a couple of minutes and start over and see if that solves the problem, the dead battery and charging may have set codes that caused your problem

Also, clean your key with wd40, at the resistor contacts and squirt a little on the key and slide it in and out of the ignition switch to clean the contacts in the switch. 

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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