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Re: 2003 Chevy Impala. Security light comes on and car...
Leave the key in the on position for 20 to 30 minutes without trying to start the vehicle. In most cases a lose of power to the computer has happened and the security must be reset.
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My impala did same thing and then would not start. I suspected anti theft problem I then had chevy dealer change ignition switch. It fixed problem second time I wasn't going to pay $ 750 for so I bought $40 dollar switch on ebay. It was an easy job following great video on you tube. When I went to start car it would not go. While doing relearn procedure (hook up battery charger before starting procedure) I got very tired of door chime so I found it was coming from left front door speaker. I removed wire to stop chime. When i went back to relearn procedure car started right up. I have a steady security light on but car has run fine for months. If you cruise and heater fan has also stopped working add wire from switched terminal on ignition switch to power feed wire on heater. It fixed both problems on mine.
Why do think the key security is bad? If you still have a factory key, this is not the problem...if no factory key, you can take your VIN number or original key to GM dealer to get new key that they will program for you...Check for dirty battery connections:)
I was told u cant bypass security light - it may be a broken wire or a wire came off starter or it could be the key switch - mine would do that - leave key in the ignition (may have to leave ignition on) for any where from 11 - 30 minutes and see if it starts then - if it does I had to have the ignition replaced and there is a recall on those for that - it costed me $605 to get it fixed - waiting to here back from Chevy about getting reimbursed for it!
Call a Chevy dealership, ask for service department. Tell them about it and ask what you have to do to get the code. Also if it is n9ot a code then they may be able to help you out by giving you some suggestions, other than bringing it in to them.
somehow your car has disabled starting due to security feature call your chevy dealership with your VIN and they can walk you through resetting the alrm so your car will start
Looks like the TDM in the security system (VATS/PassKey) is having problems, it's typical on those cars and it can get worse till the car wont start anymore. You can find a great write-up here: http://newrockies.ca , it was the only thing that saved my Park Avenue.
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