Question about Cadillac STS
The passkey security system of the car is malfunctioning, u will need to have the dealer hook up a special electronic scan tool to see what the problem is, most likely if both keys don't work in the ignition (I assume you have tried the spare key) then the receiver in the steering column for the key is defective, that is the most common cause, parts are expensive and time consuming to replace so don't guess here have the dealer run the test, will only take 1 hour of diagnostic time to determine the exact cause, if you don't have a spare key get one made and programmed and try that, any full service locksmith can do this, also if car is 1999 or newer try this passkey reset procedure:
PASSKEY LOCKOUT RESET GM CARS 1999 UP
1) Put the key in the ignition and turn to the "ON" position. Leave it that way for 10 minutes. After 10 minutes turn the key and take it out. Repeat this process (2) more times (3 times, 30 minutes total) This should reset the PASSKEY system to recognize your key.
Posted on Sep 11, 2009
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Posted on Jan 02, 2017
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Tip & How-To about Cars & Trucks
Want to bypass your vehicle security system?
The short answer is you can't!
All modern cars have alarms and immobilizers. There is a chip in the key and a chip in the ignition lock. If both are present, the ECM (engine control module) releases power to the ignition circuit. When you turn the key, the starter spins the engine and you get a spark. If any one of those three items are not in the chain, you get the engine to turn, but no spark. There is no way to beat the system.
The immobilizer is in place to stop exactly what you are trying to do. Vehicle theft has reduced to virtually nil.
Posted by Andrew... on Mar 26, 2016
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