Question about 2002 Chevrolet Impala

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My message center light comes on and says security when driving. I had to change out the ignition relay and it was ok for a day then it came back on what could be wrong and do i need this to be on or can i turn it of

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Several GM products, including the Chevrolet Impala and Malibu, the Oldsmobile Alero, the Pontiac Grand Prix, and Saturn Ion, have issues with the Security light coming on. This is many times an indication of a failing Body Control Module (BCM). Initially, the Security light will come on then go off, progressing to a constant on light, before the car will refuse to start. Other symptoms may include erratic action of electronics, a clicking sound coming from the glove box, and the air conditioning failing to blow cold air. I recommend a shop that specializes in the electronic systems of vehicles to diagnosis and make the necessary repairs. They should keep the car until they replicate the symptoms described. A new BCM from GM should cost about $230; plan on another $200 for them to diagnose the problem, replace the unit, and program the new unit. The dealers quote between $700 and $1,100 for the same repair. My experience and the experiences I have read on the internet, indicate the new BCM should last only about a year.

Posted on Aug 14, 2009

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Sounds like you are losing the power from the battery. Loose connection somewhere between the battery and the fuse box. The car is going into security mode (which prevents the car from starting). This happens when people change the car battery. Leaving the ignition key on for 10 minutes and the security light quits flashing. Car starts. I would be looking at the battery connections and other main power leads going the the relay center. Good luck.

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Passlock


The security, antitheft, or passlock light is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. 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.
This link may help you find ways to bypass this or fix it yourself.
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That would be a good place to start , I would check it with a test light first but If you do that and it starts sounds like switch or connector terminals and or starter relay in fuse box

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In the message center box security light has come on


Do you have a second key. If so try using that key to start the vehicle. Dose the light go off.

If it dose switch back to the key that causes the security light to come on. If the light comes on for one key but not the other the chip in that key is failing.

If the security light dose not go out for any key you use, it is the ignition detection unit is failing and need replaced.

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COULD BE ANTI THEFT SYSTEM, BAD IGNITION? I HAVE A CADI BUT GM HAS HAD ALOT OF PROBLEMS WITH ANTI THEFT SYSTEM THAT SHUTS DOWN FUEL IGNITION AND STARTER GOOGLE IT YOU WILL SEE LONG LIST WITH GM GOOD LUCK.

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