Tip & How-To about 1999 Pontiac Grand Am GT

Anti theft system

When your anti theft system keeps you from driving your own car. try this befor you go to the shop.
trun the key to the on position (do not try an start) leave it on for 10 to 20 min. then turn off key then try and start your car.
this should work it resets the computor. if it doesnt then you may need to go to a shop.

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2 Answers

How do I reset the ProLock system?


Hi Carol , do you mean PATS passive antitheft system ? Locked up your car ,do you mean it won't crank over an start ?
The passive anti-theft system uses radio frequency identification technology to deter a driveaway theft. Passive means that it does not require any activity from the user.
  • During each vehicle start sequence, the ignition key identification code is requested by the vehicle protection anti-theft electronics.
  • If the key's ID code has been programmed into the system, the powertrain control module (PCM) (12A650) is signaled to enable the vehicle to start.
  • If the key's ID code is not programmed into the system, or if no encoded key is detected, then the powertrain control module is signaled to disable the vehicle.
The passive anti-theft system communicates the state of the security system to the powertrain control module via the J-1850 communications network data link connector (DLC). The powertrain control modulebased on the communications from the passive anti-theft system, will determine if the vehicle's engine is enabled to start. The passive anti-theft system differs from the active anti-theft alarm system in that the passive anti-theft system enables/disables the vehicle from starting and only operates with the ignition switch in RUN/START position. The active anti-theft alarm system has perimeter protection capabilities and operates only with the ignition switch OFF. Refer to Section 13-11A for active anti-theft alarm system information.
Vehicle Disabling The passive anti-theft system will be activated and disable the vehicle from starting if any of the following conditions exist:
  • damaged encoded key
  • unprogrammed key
  • non-encoded key (key has no electronics)
  • wiring concern
  • transceiver concern
  • Passive Anti-Theft System (PATS) control module concern
  • J-1850 Communications Network concern
  • Powertrain Control Module (PCM)

Apr 15, 2015 | 1995 Ford Taurus

1 Answer

How do i get car back operating due to my anti-theft lock, not having it able to drive?


trun the key to the on position do not try to start it just leave it on for 10 to 20 min.s then trun off anf then try to start this should work.

Aug 27, 2010 | 1998 Buick LeSabre

1 Answer

1999 Mercury Cougar, Anti-theft light is flashing, car will not turn over, after I try to start it the anti-theft light stays on until I pull the key then it starts flashing. I've looked online for a new transceiver and can't find anything ?


put key in trun to on do not start or try to start just trun on. wait 10 to 20 min.s with key on this should reset the theft system.after you wait turn key off then try to start.

Aug 26, 2010 | 1999 Mercury Cougar

1 Answer

turn ignition key and motor starts up, next day turn ignition key and motor just turns over and wont start. could it be anti theft problem its a 2002 f150 4 wheel drive with 4.6 liter


This could be caused by either a faulty Crank Shaft Position Sensor or the anti-theft system. Try put key in, turn to ON position for EXACTLY 10 minutes, As SOON as anti-theft light shuts off or stops flashing, then IMMEDIATELY start the engine.

Jan 13, 2010 | 2002 Ford F150 Regular Cab

1 Answer

anti theft system on my 2000 malibu goes off when driving


Its your ignition switch. Its not recognizing when you turn it to the start position. The little terminals inside the switch get burned and wear down. When mine went out, the whole power to the dash would flicker, even cut out when driving. I actually wired my system to 1 toggle switch for on and off, I kept the anti theft wires attached to the switch. I also have a starter switch, if I fail to turn the key like I'm trying to start the car, the theft light comes on and the car dies right after starting.

Feb 20, 2009 | 2000 Chevrolet Malibu

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