Question about 1998 Chevrolet Malibu

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98 Malibu Theft control ignition shut off activates when starting the car

Need help to determine how to replace the theft control part(s) on(behind) the dash.

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  • goldstarhome Jan 04, 2009

    I have a 98 malibu and the THEFT CONTROL almost always come on when i go to start the car i am trying to find a way to by pass it if i can or fix it if possible

  • richard tom Jan 05, 2009

    How do you deactivate a faulty anti-theft system in a 1998 Chevy Malibu?

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With the 1998 anti theft what would the dealer do that a different wont do .the anti theft light id on on car wont stay on..i need help.ami1998

Posted on Nov 23, 2009

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Its called a Passlock system

What you have to do is wait for the flashing "THEFT SYSTEM" light to stop blinking before turning on your malibu.

If you don't then fuel will get cut off and the car won't start. The manual says to see a chevy dealer and they can take care of it.

Posted on Nov 10, 2009

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  • Chevrolet Master
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Thats the ignition switch the baril remove 2 screw that over the dash cluster pull the grill out disconnect the hazard connector remove the 2 bolt holding the baril key remove cluster 7mm socket there 4 bolt holding it in the hosing of the baril there a hole little screw driver or anything that fit in the hole will pushing in the hole turn the key on that remove the lock that hold the baril in pull the baril out and reinstall it thank pierre

Posted on Dec 07, 2008

  • pierre laplante Dec 07, 2008

    let me now how it turn out

  • pierre laplante Dec 07, 2008

    i can tell you how to bypass the security system

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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

2 Answers

Hi I own A 98 Chevy Malibu, my ignition locked n i had to put a new ignition switch in, well now my cars tellin me Something Theft Service. Im wonder what I need to do? Iv unhooked battery for hours ect...


You need to reset the theft system. To do this, try to start it. It should start and die. Then after it dies and the theft light is flashing, leave the key on for 10 minutes. After 10 min, the theft light should go out. After the theft light goes out, turn off the key. Count to 5, then restart it. Then it should work.

Nov 07, 2010 | 1998 Chevrolet Malibu

1 Answer

Change the swich and cylinder ignition system is activated but theft of the computer doing my car is a chevy malibu 2000


if the theft light comes on and wont let you start the car put the key in the on position untill the light goes off then start the car

Mar 09, 2010 | 2000 Chevrolet Malibu

3 Answers

My malibu won't start lights come on anti theft was triggered


turn key to on position leave on for 15 minutes turn key off for 20seconds then then theft lock will reset car should restart

Feb 25, 2010 | 2003 Chevrolet Malibu

1 Answer

MM theft system has been activated on my 98 Pontiac Sunfire and now my car won't start. I've checked my trunk for a button and I've removed the alarm fuse and still my car won't start.


I have a 97 Malibu and when the theft system light kept coming on and would only start after letting the car sit for 10 minutes we ended up replacing the complete ignition where the key goes in. Then it was fine. It wasn't cheap either. Sorry, good luck.

Dec 10, 2009 | 1998 Pontiac Sunfire

1 Answer

98 lincoln town car wont start, the theft protection is activated


theft protection rsets itself. I have never seen a PCM go bad. Some just need a reflash which costs much, much less. You can get a used PCM if you really think you need one, at car-part.com. Page with asterisk is lowest price.

here's some info on antitheft. What's your red light doing on the dash when you turn on the key or try to start the car?

The passive anti-theft system (PATS) also contains the following components:
  • Theft indicator.
  • Encoded ignition key.
  • Passive anti-theft transceiver module.
  • Hybrid electronic cluster (HEC).
  • Powertrain control module.
  • J1850 communication network.
  • Lighting control module (LCM).
The passive anti-theft system (PATS) uses radio frequency identification technology to deter a driveaway theft. Passive means that it does not require any activity from the user. This system is known as SecuriLock® in North America, Safeguard® in the U.K., and PATS in Continental Europe. This information can be found in customer literature such as the Owner's Manual.
PATS uses a specially encoded ignition key. Each encoded ignition key contains a permanently installed electronic device called a transponder. Each transponder contains a unique electronic identification code out of over 72 million billion combinations.
Each encoded ignition key must be programmed into a vehicle's hybrid electronic cluster (HEC) before it can be used to start the engine. There are special diagnostic service procedures outlined in the workshop manual that must be performed if the encoded ignition keys need to be replaced.
The encoded key is larger than a traditional ignition key. The key does not require batteries and should last the life of the vehicle.
The transceiver module communicates with the encoded ignition key. This module is located behind the steering column shroud, and contains an antenna connected to a small electronic module. During each vehicle start sequence, the transceiver module reads the encoded ignition key identification code and sends the data to the HEC.
The control functions are contained in the HEC. This module performs all of the PATS functions, such as receiving the identification code from the encoded ignition key and controlling engine enable. The HEC initiates the key interrogation sequence when the vehicle ignition switch is turned to RUN or START.
PATS uses the powertrain control module (PCM) to enable or disable the engine. The HEC communicates with PCM over the J1850 network in order to enable engine operation. The HEC and the PCM use sophisticated messages in order to prevent a theft. The HEC communicates with the lighting control module (LCM), which controls the theft indicator.The HEC and the PCM share security data when first installed together that makes them a matched pair. After this security data sharing, these modules will not function in other vehicles. The shared PCM ID is remembered even if the battery is disconnected. The HEC also stores the vehicle's key identification code even if the battery is disconnected. There are special diagnostic workshop procedures outlined in this service manual that may be performed if either the HEC or the PCM needs replacement.
All elements of PATS must be functional before the engine is allowed to start. If any of the components are not working properly, the vehicle will not start.
PATS uses a visual theft indicator. This indicator will prove out for three seconds when the ignition switch is turned to RUN or START under normal operation. If there is a PATS problem, this indictor will either flash rapidly or glow steadily (more than three seconds) when the ignition switch is turned to RUN or START. PATS also "blips" the theft indicator every two seconds at ignition OFF to act as a visual theft deterrent.
PATS differs from the perimeter anti-theft system in that PATS enables and disables the engine from starting. If equipped, the perimeter anti-theft system protects the perimeter of the vehicle (doors, hood, and trunk) and sounds an alarm.


Jun 05, 2009 | 1996 Lincoln Town Car

1 Answer

Malibu won't start


This sound different again, I am thinking, since there is a valve (controlled by on board theft system) to shut off the fuel that there is the problem area, but just dirt, you know, the usual stuff.
I do know that car runs very shortly if theft system kicks in, maybe it kicked in but valve does not quite close?
Make sure you do your 10 minute routine to disable the theft system

Aug 30, 2008 | 2001 Chevrolet Malibu

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