Question about 1997 Cadillac DeVille

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Passlock security light

The ignition is not coming on, what could be responsible?

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The security, or passlock light is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, the car misinterperates this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle.
This link may help you find ways to bypass this or fix it yourself.
http://vatspasslockpasskeysecurityhelp.yolasite.com/

Posted on Apr 29, 2013

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Im trying to get my 2004 deville started

Posted on Jul 27, 2016

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Why is my security light coming on in my 03' chevy impala when driving im scared it will stop on me when doin tht


Hard to say why the light comes on , may have a diagnostic trouble code stored in the BCM - body control module ! Do you have a bunch of other key's on the same ring as the vehicle key ?
Passlock™ System
The theft deterrent system has been incorporated into the body control module (BCM). The theft deterrent system prevents the vehicle operation if the correct key is not used in order to start the vehicle. The ignition key turns the ignition lock cylinder. The cylinder rotation produces an analog voltage code in the Passlock™ sensor. This voltage code is received by the BCM. The BCM compares the voltage code to the previously learned voltage code. If the codes match, a class 2 message is sent from the BCM to the powertrain control module (PCM). The message enables the fuel injectors and the crank relay.
The design of the Passlock™ system is to prevent vehicle theft by disabling the engine unless the ignition lock cylinder rotates properly by engaging the correct ignition key. The system is similar in concept to the passkey system. However, the Passlock™ system eliminates the need for a key mounted resistor pellet. The components of the Passlock™ system are as follows:
• The ignition lock cylinder
• The ignition switch
• The Passlock™ sensor
• The body control module (BCM)
• The SECURITY indicator
• The powertrain control module (PCM)
When anyone of these codes set the BCM will turn on the SECURITY light !
DTC B2947
DTC B2948
DTC B2957
DTC B2958
DTC B2960
DTC B3031
DTC B3033
DTC P1626
DTC P1629
DTC P1630
DTC P1631

Your best bet , take it to a qualified repair shop an have it checked !Here are some reasons for the light to come on .
Conditions for Setting the DTC
The BCM detects a short to ground on the Passlock sensor power circuit for 1 second, with the ignition switch in the ACCESSORY, ON, or START position.
The PCM has detected a loss of the state of health serial data message from the theft deterrent system.

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Why does the battery/security light flashing in message center? Bad Passlock Ignition Sensor? How to diagnose bad Passlock Ignition Sensor? Have to perform 10min RELEARN PROSS. to start engine.


I read your problem, and I think Reliable-Store has the solution of your problem, Just visit the link I attached here, I'm sure you will get the solution of your problem forsure. Best Manuals

Mar 17, 2017 | Cars & Trucks

1 Answer

How do you put the resistor in the passlock system on a Oldsmobile Alero


You don't say if the security light is lit ? Is it ? If not , it's not a anti-theft system problem . An the passlock system on your vehicle the passlock sensor is part of the ignition lock cylinder . No resistor ! If the security light is lit you need to have it check for codes . There are a number of DTC'S that can set .
DTC B2947
DTC B2948
DTC B2957
DTC B2958
DTC B2960
DTC B3031
DTC B3033
DTC P1626
DTC P1630
DTC P1631
DTC P1632

The Passlock™ system is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate or the ignition switch is operated while separated from the ignition lock cylinder case. The body control module (BCM) provides security system sensor power and low reference for the Passlock™ sensor. The BCM also measures the security system sensor voltage.
When the correct key is used to start the vehicle, a magnet on the lock cylinder passes close to the Passlock™ sensor within the ignition lock cylinder case. The magnet activates the security hall effect sensor in the Passlock™ sensor which completes a circuit from the security sensor signal circuit through a resistor to the security sensor low reference circuit. The resistance value will vary from vehicle to vehicle. The BCM will measure the voltage on the security sensor signal circuit and compare this voltage to a previously learned voltage. If the voltage measured is within the valid range, the BCM will send a class 2 message to the powertrain control module (PCM) to enable vehicle starting. If the voltage measured is not within the valid range, a class 2 message will be sent to the PCM to disable starting of the vehicle.

Nov 04, 2016 | Oldsmobile Cars & Trucks

1 Answer

2000 suburban was stolen replaced ignition cylinder it turns over but no start


Do you have a security light lit or flashing on the Instrument cluster ?
The theft deterrent system has been incorporated into the body control module (BCM). The theft deterrent is provided in order to prevent the vehicle operation if the correct key is not used in order to start the vehicle. The ignition key turns the lock cylinder. The cylinder rotation produces an analog voltage code in the passlock?"¢ sensor. This voltage code is received by the BCM. The BCM compares the voltage code to the previousely learned voltage code. If the codes match, a class 2 message is sent from the BCM to the powertrain control module (PCM)/vehicle control module (VCM). The message enables the fuel injectors.
The design of the passlock?"¢ system is to prevent vehicle theft by disabling the engine unless the ignition lock cylinder rotates properly by engaging the correct ignition key. The system is similar in concept to the passkey system. However, the passlock?"¢ system eliminates the need for a key mounted resistor pellet. The components of the passlock?"¢ system are as follows:
?€¢
The ignition lock cylinder


?€¢
The ignition switch


?€¢
The passlock?"¢ sensor


?€¢
The Body control module (BCM)


?€¢
The security telltale


?€¢
The vehicle/powertrain control module (VCM/PCM)


The ignition lock cylinder is located at the upper right side of the steering column. The Passlock?"¢ sensor is in the steering column. The Passlock?"¢ sensor is separate from the key and lock cylinder. The key and the lock cylinder work together in order to determine if the proper ignition key was used to start the vehicle.
In the event of an open Class 2 serial data line between the BCM and the VCM/PCM, the vehicle will become fail-enabled if the VCM/PCM has already received the password from the BCM for that ignition cycle (the engine is running). In this event, the following conditions occur:
?€¢
The security telltale will be ON continuously.


?€¢
The VCM/PCM will become fail-enabled for future ignition cycles.

If a failure in the Class 2 serial data line occurs before the ignition cycle, when the VCM/PCM is not fail-enabled, the following conditions occur:
?€¢
The VCM/PCM will never receive a valid password in order to enable the fuel injectors.


?€¢
The vehicle will not start.


The lock cylinder and the visible key insert portion of the ignition switch are located at the upper right side of the steering column. The electrical switching portion of the assembly is separate from the key and lock cylinder. The electrical switch portion is hidden inside the steering column. The electrical switch portion and the key and lock cylinder synchronize and work in conjunction through the action of the mechanical assembly between the 2 parts.
Passlock?"¢ Sensor
The passlock?"¢ sensor is inside the upper right side of the steering column. The passlock?"¢ sensor contains 2 hall effect sensors. The tamper hall effect sensor is on the top. The security hall effect sensor is under the tamper hall effect sensor. Both of the hall effect sensors monitor the magnet of the lock cylinder through an opening. The tamper hall effect sensor is physically placed on top of the security hall effect sensor. This arrangement enables the tamper hall effect sensor to engage first if an intruder attempts to bypass the passlock?"¢ sensor by placing a large magnet around that area of the steering column. There is a tamper resistor inside the passlock?"¢ sensor in order to help prevent tamper to the system. Passlock?"¢ equipped vehicles have a selection of 10 different security resistors ranging from 0.5K ohms up to 13.6K ohms. Installing one of the security resistors inside the passlock?"¢ sensor will generate a unique passlock?"¢ code. All 10 combinations of the passlock?"¢ sensor have the same part number. However, you cannot simply replace the passlock?"¢ sensor and expect the system to operate properly. Always start by performing the Diagnostic System Check first and following the instructions.
SECURITY Telltale
The SECURITY telltale appears on the message center inside the instrument cluster. If the SECURITY telltale flashes or if the SECURITY telltale lights continuously during the vehicle operation, refer to the system diagnosis.
Fuel Lockout Cycle
The Passlock?"¢ system has a lockout cycle of approximately 10 minutes. Once the vehicle is in the lockout cycle, the vehicle remains in the lockout cycle for 10 minutes, even if the ignition switch is turned from the RUN position to the OFF position.
The Passlock?"¢ system uses the lockout cycle in order to synchronize all of the Passlock?"¢ components when any Passlock?"¢ related part is changed. The Passlock?"¢ system requires 3 consecutive lockout cycles in order to complete the 30 minute learn procedure for a changed component.

Mar 10, 2015 | Cars & Trucks

1 Answer

I just installed a new key switch in my 2006 trailblazer it is a napa part now when I start it it will only run for a few seconds and die ?


That is because of the vehicle theft deterrent system ! Do you have a security light lit on the instrument cluster ?
The Passlock?"¢ System is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate or the ignition switch is operated while separated from the ignition lock cylinder case. If starting is attempted without authorization from the Passlock?"¢ System, the powertrain control module (PCM) will disable engine starting. Start disable may be in the form of fuel disable or starter disable, depending on engine application.
The components of the Passlock?"¢ System are as follows:
?€¢
The ignition lock cylinder and key


?€¢
The ignition lock cylinder case, including the Passlock?"¢ sensor


?€¢
The ignition switch


?€¢
The body control module (BCM)


?€¢
The security indicator on the instrument cluster


?€¢
The powertrain control module (PCM)

Ignition Lock Cylinder Case, Including the Passlock?"¢ Sensor
The ignition lock cylinder fits inside the ignition lock cylinder case and operates the ignition switch when turned by a key with the proper mechanical cut. When the ignition key is used to turn the ignition lock cylinder to crank, start, a magnet on the lock cylinder passes close to the Passlock?"¢ sensor within the ignition lock cylinder case. The magnet activates the security hall effect sensor in the Passlock?"¢ sensor which completes a circuit from the security sensor signal circuit through a resistor to the security sensor low reference circuit. The resistance value will vary from vehicle to vehicle.
If a magnet from outside of the ignition lock cylinder case is used to attempt to steal the vehicle, the tamper hall effect sensor will be activated. This completes a circuit from the security sensor signal circuit through a tamper resistor to the security sensor low reference circuit bypassing the security resistor. If the ignition switch is forced to rotate without the correct key, or if the ignition lock cylinder is removed by force, the Passlock?"¢ sensor will be damaged and will not operate.

Feb 22, 2015 | 2006 Chevrolet Trailblazer

1 Answer

Vauxhall engine


The ignition system is responsible for the starting engine:
the primary circuite is battery, ignition switch, ignition contact, condenser, ballast resistor. The secondary circuite. provide high tension to fire the spark plugs, add ignitioncoil, distributor, cap, rotoretc, high tension wiring, spark plugs. Test the mayor problem: 1) contact points and 2) coil.IF the ignition system do not provde the 20,000 or 30,000 volts, for spark plugs, will not work.

Easy test carefully:use screwdriver with the spark plug cables put around about 1/4 of inch againt the chassis give ignition, and some spark is coming, test by each spark plug cables, IF do not the coil can be faulty.

God bless you

May 09, 2012 | Vauxhall Cars & Trucks

1 Answer

Replaced ignition car wont start


Here is a link that can help you with the bypassing of your Passlock antitheft system. http://vatspasslockpasskeysecurityhelp.yolasite.com/

Mar 25, 2012 | 2000 Oldsmobile Alero

2 Answers

My trail blazer 2006 wont start and it has a light on of a car with a lock what does this mean heeelp please as soon as possible emergency


You have now experienced GM's terrible anti theft security system. These systems are known for failing and will cost you an arm and a leg to fix. Anywhere from $350 - $700 plus labor. Most mechanics wont even touch these "PASSkey" security systems.You'll have to go to a Dealer mechanic. The good news is that you can bypass these systems permanently. And you're vehicle is one of these lucky ones that CAN be bypassed. This link should help you find what you need and help inform you of how this system works.

http://vatspasslockpasskeysecurityhelp.yolasite.com/ TRAILBLAZER 2002 2003 2004 2005 2006 2007 2008 Effected by Passlock/PASSkey Failure. tayjoejoe_17.jpg

Jul 11, 2011 | 2006 Chevrolet Trailblazer

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