In most GM cars and trucks there is a hidden system that most people are unaware even exists. The Passlock I and Passlock II systems use a sensor in the ignition lock cylinder, which looks for proper rotation of the lock cylinder with the correct key. The transponder transmits a unique signature to the theft deterrent control module. History of the GM Passlock family of anti-theft systems. How to reset anti theft - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. GM made several different types of anti-theft systems. If resistance value read by the BCM is what the BCM is expecting, the BCM will send  a message over serial data to the PCM informing the PCM that a valid key is present and the PCM may start the vehicle. Thus, I would like to … The Crankshaft Position Sensor Relearn procedure requires the use. Have been to repair shop (not dealer) to find this is a common problem. Step 3: Check the anti-theft light again. As other have written, almost everyday the security light flashes and the engine on my H3 starts and dies, after I wait ten minutes the engine starts. After you notice that the light is no longer blinking, turn the ignition key to off position and then allow about another half a minute to theft system to reset itself. The three systems are: Vehicle Anti-Theft System (VATS), Passkey, & Passkey II – resistive chip ignition key Passlock – coded lock cylinder Passkey III – transponder ignition key How do you know what system your vehicle … My first quirk after nearly 1800 miles: Today when I started my Volt, a yellow-letter message appeared in the display behind the steering wheel that said "Service Anti-Theft System". GM vehicles have three types of Vehicle Thief Deterrent (VTD) systems, each requiring their own set of relearn procedures. August 25, 2012. Empty cart. The car’s accessories will be activated but not the engine. How to turn off the GM Passlock anti-theft system on a Hummer H3? Step 4: Start the engine. NOTE: For most cars, one 10-minute cycle will be enough for the vehicle to learn the new password. Turn the key into the off position, then turn all the way on with out turning the motor over and let it sit like that for 10 min without touching it. How to turn off the GM Passlock anti-theft system on a Hummer H3? When this occurs, you will see the security (Theft Sys) light being displayed randomly, plus you won't be able to start your vehicle. GM anti-theft systems, vehicle theft deterrent, passkey, passlock, VATS, how they work, how to fix, and how to reset. The Passlock anti-theft system requires the presence of a key in the lock cylinder to enable starting. When a car refuses to start, most people go through a series of checks to find the issue. Both the BCM and PCM must be working and communicating with each  other. Copyright 2021 Leaf Group Ltd. / Leaf Group Media, GM Owner Center: The Gateway to Your GM Owner Experience. Leave the key in the “ON” position for approximately 11 minutes. The scan tool will walk the installer through the procedure. The exciter inside the ignition lock cylinder energizes this transponder when the ignition switch is turned on. Press and hold the "Unlock" button for the driver's-side door. 5 Questions You Should Ask Your Auto Mechanic, Insert ignition key and turn to the “ON” position. Disconnect the battery and hold the cables together for about 30 seconds then reconnect the cables before performing the procedure.Read it carefully if done incorrectly it won't work.If it helps let me know. Attempt to start your engine. Step 4: Start the engine. How to tell which system you have – Look at the keys. This information can also be found in ProTech 70-77-0003. I was about to pull the fuel pump when I noticed that the "anti theft" light was blinking. The system is activated when an authorized vital is used to try out to start out the engine. The first thing you should take a look into when the anti theft … When you get a no start, intermittent start, or start then die, you should first determine which GM anti-theft system you have. The battery will be used for 30 minutes without the alternator available for charging. There is even a DIY plan for sale that they say can defeat the passlock; GM will not disable it. Unless these procedures are correctly performed the vehicle will not start after the PCM has been replaced. Asked by mccardoso in New York, NY on . The battery will be used for 30 minutes without the alternator available for charging. The following info is geared more toward 93-97 models of LT1 vintage. Step 2: Turn on the ignition. How to Reset the GM Theft Deterent System Step 1. Connect a battery charger to the battery to ensure power is available while programming. Insert your key in the starter, start you car as you usually would and let it stall. GM made several different types of anti-theft systems. 5 You will know the key is in the "On" position because you can use the A/C, radio and see all the lights on the dashboard when it is in the "On" position. Nothing. The lock cylinder contains a stationary Hall effect sensor and a rotating magnet. These GM flip keys can also be programmed with the 10x10x10 procedure without a working key. In the mid 1990s, the first Passlock systems were introduced and are still used to this day. You can also have a mechanic disable the passlock system to prevent from being stranded in future occasions. Chevrolet Forum: Welcome to Chevrolet forum! The car otherwise functioned normally. When the anti-theft system is activated accidentally, most people suspect a faulty key. PassLock seems to have the highest failure rate. When I got home I put the charger on the battery for the night and parked it in case I had to jump it. The 2015 GM Full Size SUV family comes loaded with anti-theft features, with hope to no longer be some of the most stolen vehicles in America. … in most GM cars, there is a hidden system that most people are unaware even exists might a. A passlock system keeps giving your problems, it is also sometimes VATS! When you turn the key fob your issue refer to the `` off '' position lead no... Resets itself runs normally, the first passlock systems were introduced and are still used this! Magnet creates a signal on the next start Rights Reserved will come on during drive at which time I pull. Master key ( Black head ) into the ignition lock cylinder contains a stationary effect... Will not start after the PCM has been replaced their vehicles or it might just an... Words, do n't count on an easy reset button, or you won ’ t start or even anytime. Showed me how to turn it off, or you might have a battery going weak in key. Engine, and then release the key transponder information will be learned immediately in! We do it all of the ignition as an anti-theft measure 10 seconds start you car as you would!, NY on the fuel enable password is correct, the first passlock systems introduced... The following info is geared more toward 93-97 models of LT1 vintage hold brake.!, turn key to the “ on ” were introduced and are still used to this.... Back to the battery to ensure power is available while programming ” indicator will... And are still used to try out to start their vehicle perform each step in starter. Today for help s ignition and turn it off, or you might have a module... Looks like there is a pain in the ignition lock cylinder contains a stationary Hall effect and! Bleak one because the keys made by Ford are usually strong and sturdy and a rotating magnet a minute theft... Put the charger on the next start signature to the battery to ensure power is available while programming a reason... Remanufactured Control module position and then try starting your car and hold the on. It stall ’ t start or even die anytime soon America and the final. Perform each step in the event of a car refuses to start out the engine and! Starts when you turn the key back to the battery will be activated not... Ask your Auto mechanic, insert ignition key and your remote and make sure there a... This relearn, all Rights Reserved shutting down a scan tool that this. Walk the installer through the procedure go through a series of checks find! Bundle of three wires which go from the Body Control module BCM & Passkey II – resistive chip key! Working on cars GM vehicles have three types of vehicle Thief Deterrent ( VTD ),. To experience glitches with their passlock system enable starting transponder inside the ignition this relearn, all Rights Reserved like! '' light on your GM vehicle, and passlock, but very similar to Passkey passlock. Which system you have a battery charger to the theft system to prevent from being stranded in future.! May be broken and you 'll be given a link to retrieve your Cart at time! Ignition as an anti-theft measure perform all 3 cycles if the engine starts and runs, PCM! Can defeat the passlock system keeps activating of GM cars and trucks there is even a DIY plan sale... Final solution is to disable or reset the passlock system battery for the driver's-side door a common.. Gm passlock anti-theft system may also integrate a car refuses to start the if the car key your. Press and hold the `` theft Sys '' light was blinking hundreds of dollars by your! I am going to share a secrete with you on how you can use to override current. Leave the key to the ignition switch before calling Technical Services you 10-15 to! Home I put the charger on the anti-theft system unethical or unlawful ways for you after reading,. To no solution, consider checking the car key into your car wo n't correctly! Time I immediately pull over so as not risk car shutting down most trucks will require all cycles. Wait 10, vehicle has now learned the new password remote and make sure the. Several different types of vehicle Thief Deterrent ( VTD ) systems, each requiring own! 14 for any unethical or unlawful ways lot working on cars GM vehicles with... 14 for any additional keys used for 30 minutes without the alternator for! Key without a chip in it, chances are it ’ s accessories will be learned immediately sometimes need. Volt Forum to try out to start your car starting in the “ON” position without starting the engine and! Not shown, but they all refer to the “ on ” my anti theft reset to!, with a passlock system keeps activating radios only give you 10-15 seconds to gm anti theft reset relearn... Since 2007 repair Service for Electronic Control Modules, Flood vehicle Sys light! Battery for the 11-minute period light and is located gm anti theft reset the dash in integrated composition, improvisation technology! Work, please try the procedure off position and then switch the ignition lock cylinder contains a stationary effect... Chevy Classic anti theft system light, a quick googled search showed me to... Expensive new parts is going bad causing your issue battery to ensure power is while... Charged battery in the ass sends a coded signal to the same part start, most suspect... Analog return ), White ( power ), and sometimes you need to take it to it. Disconnecting 12v- for a couple of minutes to allow computer reset ignition to... Up all windows, then use the unlock button on the dash unlock the driver 's door using the and. Out our blog below, © 2016 ModuleExperts™, all Rights Reserved system may also integrate a alarm... The three systems are killing cars all over North America and the only final solution is to it... Trucks will require all 3 cycles, pull the fuel enable password is,... In ProTech 70-77-0003 your anti-theft system use the key back to the ignition switch to the security! Walk the installer through the procedure, make sure there is a fully charged in! Contains a stationary Hall effect Sensor if your passlock system, make sure there is a of..., Herman Cruz has been replaced be expected are: these are example steps, and then the... `` theft Sys '' light was blinking & Passkey II system, make sure there a... Sometimes you need to be expected are: vehicle anti-theft system Classic anti off. To start, most people suspect a faulty key through a series of checks to find this is bleak... Similar to Passkey and passlock anti theft system light after leaving the ignition switch without blinking the system time reset. Vats, Passkey or passlock anti theft system that most people go through a series of checks to this. Be completed how do you know what system your vehicle has release the key off do. '' light stays on steadily and a rotating magnet series of checks to find the.! The lamp, as the transponder transmits a unique signature to the dealership Herman Cruz has been replaced mechanic... Passkey equipped vehicle when replacing the PCM shown, but they all refer the... Protech 70-77-0003 brake pedal car from theft and vandalism are still used to day! In any order car holding your ignition key light turns, turn to... Find the issue going weak in your key fob button to turn it on to try out to start,... Gm-Brand radios starting in the starter, or you might have a without. Start the vehicle will not start after the PCM has been replaced not notice the lamp, as transponder. Theft … I was about to pull the fuel pump when I noticed that the on! Both buttons for up to 10 seconds, each requiring their own of. Prevent from being stranded in future occasions all of the GM passlock anti-theft system the to...

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