Theft retail S1 theft act 1968 is there harm to visa wxtension

You can't just change parts an expect it to work , software , modules won't let it work . You have to take it to the dealer or have a mobile lock smith fix it , reprogram it ETC...
Anti-Theft -Passive Anti-Theft System (PATS) The passive anti-theft system (PATS) contains the following components:

• theft indicator
• encoded ignition key
• PATS transceiver module
• powertrain control module (PCM)
• standard corporate protocol (SCP) communication network
• Passive Anti-Theft System (PATS) -Diagnostic Trouble Codes (DTC) Index Powertrain Control Module Diagnostic Trouble Code (DTC) Index DTC Description Source Action B1213 Anti-Theft Number of Programmed Keys is Below Minimum PCM GO to Pinpoint Test F . B2431 Transponder Program Failure PCM VERIFY if using correct PATS key, if defective USE new key. B1342 ECU is Defective (EEFROM in PCM not working) PCM INSTALL a new PCM. REFER to Section 303-14 . B2103 Antenna Not Connected PCM GO to Pinpoint Test A . B1600 PATS Ignition Key Transponder Signal is Not Received PCM GO to Pinpoint Test B . B1601 PATS Received Incorrect Key-Code From Ignition Key Transponder PCM GO to Pinpoint Test C . B1602 PATS Received Invalid Format of Key-Code From Ignition Key Transponder PCM GO to Pinpoint Test D . B1681 PATS Transceiver Module Signal is Not Received PCM GO to Pinpoint Test E . - All Other DTCs PCM REFER to Section 419-10 .

It's hard to fix something if you don't know how it works ! Fixed ignition ? What did you fix or change ?
SERVICE THEFT SYSTEM
Security: Refer to Theft Systems Description and Operation in Theft Deterrent
You need to have it checked for trouble codes .
The theft deterrent system on this vehicle is comprised of two separate systems, the vehicle theft deterrent (VTD) system and the content theft deterrent (CTD) system. The VTD system prevents drive away theft by keeping the vehicle from starting. The CTD system is the vehicle alarm system which discourages unauthorized entry into the vehicle. These systems are described and diagnosed separately within this section.
Theft System Indicators
SECURITY The instrument panel cluster (IPC) illuminates the SECURITY indicator as determined by the vehicle theft deterrent (VTD) system and the content theft deterrent (CTD) system. The IPC receives a message from the theft deterrent control module or the rear integration module (RIM) via the serial data circuit requesting illumination.
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The VTD system requests the IPC to illuminate the indicator only when the ignition switch is ON. The VTD system uses the indicator as a malfunction indicator. For specific VTD condition that will illuminate the security indicator, refer to Vehicle Theft Deterrent (VTD) Description and Operation .

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The CTD system requests the IPC to illuminate the indicator only when the ignition switch is OFF. The CTD system uses the indicator in order to identify system status. For specific CTD condition that will illuminate the security indicator, refer to Content Theft Deterrent (CTD) Description and Operation .

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The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
SERVICE THEFT SYSTEM The radio illuminates the SERVICE THEFT SYSTEM message when the VTD system detects a failure. The radio receives a message from the theft deterrent control module via the serial data circuit requesting illumination.
This is one you need to take to the dealer , unless you have a GM factory scan tool !

anti theft on 1996 mercury sable need to by pass or try off completely when it acts up it will not start please help

bcm has very little to with the anti theft. you need to de active the anit theft

Sounds like maybe you knocked the Crank Sensor loose, or possibly the injector plug harness up top near the alternator. Check all of your wiring really good in the vacinity that you were working in and around. If your anti theft light isnt flashing you in the face with the key on and engine off it isnt a fuel or theft issue. The anti theft system disables the fuel to the injectors, if you raised the car too high it can trigger the anti theft and it must be reset, but unlikely. Check all of your connections.

alot of cars with anti theft can be reset by locking and unlocking the drivers door with the key give it a shot

The anty theft controler is U/S.Hope this helps.

Not true call the dealership and speak to the service department and tell them what you did and the service tech will tell you how to reset the system. Most GM tech are very helpful. good luck

Cadillac dealer can by pass that anti theft module

My 2000 cavalier has done this for 6 months. You take your key out then open your door, wait ten minutes and the system resets itself and the car will start-annoying you bet!!!