Question about 2002 Chevrolet Blazer

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My vehicle stalls out after initial start up we think due to improper communications involving the vehicle's theft alarm in the computer system. Can we use a similar year of vehicles' (1991) computer as a replacement if it's out a different model of vehicle. We're having a hard time trying to locate a used one. Thank you..

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Nope, body styles and system packages differ as well as engine accessories, however to confirm this get both car info goggle auto computers and pick a site that shows both car computers and see if they both have same part numbers

Posted on Jul 19, 2009

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Posted on Jan 02, 2017

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I removed my alarm system keystartremove n now want start 98 old cultass 3.1 engine


You can't do that an expect the vehicle to start , software programmed in the computer system . If the engine PCM doesn't see a pass word or coded message from the BCM or anti-theft module . IT will disable starting and or fuel injetor control .
Important: Due to component variability, the vehicle theft deterrent (VTD) system must have the learn procedure performed regardless, if the vehicle starts on the first ignition cycle after a VTD repair.
All codes in the theft deterrent module must be cleared for a relearn.
The vehicle theft deterrent system is designed in order to prevent vehicle theft by disabling the fuel injectors unless the lock cylinder is correctly engaged by a mechanical key. The theft deterrent system uses the following 4 components for theft prevention:
• The lock cylinder
• The ignition switch
• The body control module (BCM)
• The powertrain control module (PCM)
When starting the engine, the PCM searches for a password from the BCM through the Class 2 serial data circuit. If the password is not recognized or not present, the PCM will disable the engine. Two modes of tamper detection are provided:
• No password received
The engine will start and stall quickly. SECURITY telltale will flash on the instrument panel cluster (IPC) and then stay ON steady.
• Incorrect or disable password received (More than 3 invalid passwords are received)
The engine is disabled for at least 10 minutes and the SECURITY telltale will illuminate solid on the IPC during the 10 minutes.
After the vehicle has passed theft detection, the PCM will continue normal operation.

They do sell by pass modules you can find on the internet , in some cases it cheaper to have it fixed proper by a qualified repair shop . It just depends what the original problem was . You how ever just complicated matters by changing thing's .

Jan 08, 2017 | Oldsmobile Cutlass Cars & Trucks

1 Answer

99 explorer alarm disables. Motor dies


Anti-theft system can keep vehicle from starting , Alarm is for vehicle content theft , open door without key alarm sounds (horns) ! PATS - passive anti theft system PATS enables and disables the engine from starting ,it will not cause the engine to die ! You have some other kind of problem ! If the vehicle engine doesn't turn over an red light on top of dash flashes fast ,then you have anti-theft system problem !
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.

Aug 17, 2016 | Cars & Trucks

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

Lincoln tow car 2001 passive anti tip DTC 1260 I replaced pcm.trancevier.instrument cluster.2new ignition key but no communication this module what possible problem this?


No where in the DTC - description does it say anything about replacing any modules . An does not have anything to do with a communication problem ! You need a professional grade scan tool to communicate with the PATS system ! An if you don't know these thing's you better take it to pro !!!!!!!
P1260 - Theft Detected - Vehicle Immobilized Indicates that the passive anti-theft system (PATS) has determined a theft condition existed and the engine is disabled. This DTC is a good indicator to check the PATS for DTCs.
  • Previous theft condition
  • Anti-Theft System failure
Theft indicator flashing rapidly or on solid when ignition switch is in the ON position. Check anti-theft system for DTCs. Typical vehicle symptoms are: Start/Stall or Crank/No Start. NOTE: No crank symptom only on vehicles equipped with PATS starter disable feature

Apr 04, 2015 | 2001 Lincoln Town Car

1 Answer

Where is a pass lock device and about how much do they cost i think this is the problem the truck will start and stall


The Passlock system consists of your key, your ignition/lock cylinder, and the TDM (theft deterrent module- also known as the "computer") Any one of these 3 parts not communicating with the other two causes the passlock to fail and stall out your vehicle. Here is a link that explains the whole system, symptoms of a failure, how it works, and some "DO IT YOURSELF" ways to fix it. Good luck

Apr 23, 2011 | Chevrolet 1500 Cars & Trucks

2 Answers

I had disconected a battery overnight. My key fob hasn't worked ewer since. What can I do?


When the battery was disconnected the computer lost it memory and it has to be programed with a Volvo Scan tool. There are other computer relearn procedures for vehicle or system operation. These may include:

Initial control unit programing

Traction control yaw sensor initializing

Multiplex communication

Anti-theft system or engine immobilizer system passwords


Volvo still won

Jan 07, 2011 | 2000 Volvo S40

1 Answer

Is there a kill switch for an alarm on a 1998 mountaineer that will help the car start


The passive anti-theft system (PATS) contains the following components:
  • theft indicator
  • encoded ignition key
  • transceiver module
  • PATS control module (located behind the passenger side air bag module)
  • powertrain control module (PCM)
  • standard corporate protocol (SCP) communication network
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 Owners Guide.
The 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 PATS module before it can be used to start the engine. There are special diagnostic repair procedures outlined in this 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 electronics module. During each vehicle start sequence, the transceiver module reads the encoded ignition key identification code and sends the data to the PATS module.
The control functions are contained in the PATS module. This module performs all of the PATS functions such as receiving the identification code from the encoded ignition key and controlling engine enable. The PATS module initiates the key interrogation sequence when the vehicle ignition switch is turned to RUN or START.
PATS uses the p owertrain control module (PCM) to enable or disable the engine. The PATS module communicates with the PCM over the SCP communication network in order to enable engine operation. The PATS module and the PCM use sophisticated messages in order to prevent a theft. The PATS and the PCM share security data when first installed together, making them a matched pair. After this security data sharing, these modules will not function in other vehicles. The PCM shared security ID is remembered even if the battery is disconnected. The PATS module also stores the vehicle's key identification code, even if the battery is disconnected. There are special diagnostic repair procedures outlined in this workshop manual that may be carried out if either the PATS module or the PCM needs replacement.
All the elements of PATS must be functional before the engine is allowed to start. If any of the components are not working correctly, 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 indicator will either flash rapidly or glow steadily 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.
The PATS is not compatible with aftermarket remote start systems, which allow the vehicle to be started from outside the vehicle. These systems may reduce the vehicle security level, and also may cause no-start issues. Remote start systems must be removed before investigation of PATS-related No Start issues.
The passive vehicle protection system will be activated and will disable the vehicle from starting if there is a:
  • damaged encoded key.
  • unprogrammed key.
  • non-encoded key (key has no electronics).
  • wiring concern.
  • transceiver concern.
  • PCM concern.
  • module communications network concern.

Mar 10, 2010 | 1998 Mercury Mountaineer

1 Answer

1260 code wont start


P1260 - This, basically is indicating that a theft has occurred, and the engine has been disabled.If the engine stalled, during travel, and the code was pulled after the stall, this will indicate the following:

1.A loss of power, or ground wire to the PCM
2.A Faulty PCM power relay
3.A Faulty EEC power diode
4.A Faulty VERF signal.

Passive Anti-Theft System (PATS) communicates PCM through instrument cluster to enable or disable vehicle's engine. Within one second after engine start, PCM must receive an enable signal from instrument cluster or engine will be disabled. Along with enable signals, instrument cluster and PCM share messages that confirm security codes shared during initial installation. This shared security data makes instrument cluster and PCM a matched pair, so neither will operate in another vehicle. When system is functioning properly and ignition switch is turned to RUN or START position, THEFT indicator light will turn on for 3 seconds, then turn off. Vehicle will be enabled to start and run. If a problem exists in PATS, THEFT indicator light will stay on or flash continuously.


NOTE_ The best action is to clear the code, by using a diagnostic CPU. Plug the CPU into your in car port, under the dash. Follow the instruction on the CPU display to clear the code. if the engine dose not start after the code is cleared, this will indicate that there are some issues with the PCM, or PATS

Nov 11, 2009 | 1999 Ford Taurus

1 Answer

My cirrus is having a problem it will stall and then wont restart for 20 to min usually.i have found that when this problem comes up if i arm the anti theft system set off alarm and then reset it . the car...


there is a chrysler tsb for this problem.it involves removing the powertrain control module and body control module and replacing them with modules without security feature.the vehicle milage is stored in the bcm so you will need a one with close to same milage

Aug 08, 2009 | Chrysler Cirrus Cars & Trucks

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