Posted by Inno on May 29, 2010 at 20:08:39 from (76.66.63.176):
In Reply to: OT GM car question posted by teachingscience on May 29, 2010 at 19:04:48:
The Malibu has GMs Passlock II security system. There is nothing in the key on this one but when a key is put in the ignition, a resistor value specific to your car is sent to the vehicle's computer that enables it to start. If the computer does not get the resistor value, it assumes that someone is tampering with the ignition system by hot wiring or by destroying the ign. switch and it will not start. This is likely caused by the ignition tumbler wearing out and not providing a proper contact where it is needed. GMs of that age are notorious for that. It can be bypassed permanently by a competent technician. GM may even have a bulletin for it. I install remote car starters and I know what I would do. Read the resistor value and put a resistor (or combination of resistors) across the security wires with a relay so that every time you start the car it will get the proper resistance.
The 2000 Grand Prix has PK3 security which has a transponder chip in the head of the key. Unless the proper chip is recognized (by an RF signal sent from the key head when inserted in the ign.) the car will not stard. A little more advanced than the Passlock II but every bit as frustrating when it does not work. If you have two factory original keys that will start the car, you can likely program a third. If you only have the one that will start the car you would have to get a dealer to program another one for you..........$$$$
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