Question about 2003 Chevrolet Monte Carlo

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Passlock I was driving the other day and all the sudden the "security "light in the message center lit up and stayed on until I shut the car off ( over 20 miles) BUT the car drove fine. It has come on 3 times in the last 500 mi or so but as of late it has not come on at all. The car starts up fine and drives fine BUT I DONT WANT TO GET STUCK SOMEWHERE! and I have read up on this passlock issue and have a question. when the car is off ( but the doors closed and I turn the key to the "on" position the battery and security light alternate ( flash) is this normal? or does that indicate a problem?? I have an appointment at as chevy dealer to look at it I do have extended warranty that should cover the repair.What has me stumped is the car drives fine, the light has not come on in about 5 days now and shows no problem that I can see. Is that alternating flashing normal in the "on" position? my car is a 03 with only 63,000 miles on it any help appreciated!!

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  • Chevrolet Master
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The security, antitheft, 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 May 13, 2013

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Posted on Jan 02, 2017

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  • 507 Answers

SOURCE: Chevy Blazer 1999,car doesn't keep running after started ,car has Passlock

hmmm, sounds like an ignition switch problem. Not the tumbler/key switch, the ignition switch.

Posted on Sep 07, 2008

SOURCE: battery light flashes red car shuts off while driving

try making sure the battery cable and alternator is grounded

Posted on Apr 15, 2009

  • 541 Answers

SOURCE: 2004 Avalanche Electrical Failure

no not a typical ignition problem. sounds like bad connection. yes check cables first. then check under hood fuse box. check engine ground. check little red box under hood by battery. check start cable connections. nice truck sorry to hear of the problem

Posted on Dec 31, 2009

  • 10 Answers

SOURCE: Security flashes, 2 times truck did'nt start

COULD BE ANTI THEFT SYSTEM, BAD IGNITION? I HAVE A CADI BUT GM HAS HAD ALOT OF PROBLEMS WITH ANTI THEFT SYSTEM THAT SHUTS DOWN FUEL IGNITION AND STARTER GOOGLE IT YOU WILL SEE LONG LIST WITH GM GOOD LUCK.

Posted on Apr 13, 2010

  • 355 Answers

SOURCE: 95 monte carlo security light flashing and wont

The security system (VATS/PassKey) is having problems, it's typical on those cars. You can find a great write-up here: http://newrockies.ca , it was the only thing that saved my Park Avenue.

Posted on Sep 10, 2010

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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

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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

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Safelock on 2006 Pontiac Torrent. Randomly prevents starting. Seems to reset after a day or so. Is there a way to disable


It is the passlock system not safelock An you can't just disable it . It is software program into the BCM - body control module an the PCM - powertrain control module .Simply disconnecting the wires from the ignition to the BCM will render your vehicle useless . If an when the security symbol light is on you need to have it checked for DTC'S - diagnostic trouble codes . A GM dealer ,Chevy , Buick , Cadillac etc.... we know Pontiac is no longer around. Everything will work except the PCM will not let the fuel injectors work .
Passlock?"¢ System
The theft deterrent system has been incorporated into the body control module (BCM). The theft deterrent system 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 allows the lock cylinder to rotate. 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 serial data message is sent from the BCM to the powertrain control module (PCM). The message enables the fuel injector operation.
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 any key mounted components. The components of the Passlock?"¢ system are as follows:
?€¢
The ignition lock cylinder


?€¢
The ignition switch


?€¢
The Passlock?"¢ sensor


?€¢
The BCM


?€¢
The security indicator


?€¢
The PCM

Jun 24, 2016 | 2006 Pontiac Torrent

1 Answer

How to bypass passlock on 1999 chevy blazer


The most common repair is to replace the ignition lock cylinder due to broken wires inside the steering column. Most common problems related to the Passlock family involve the Passlock sensor. The sensor is part of the ignition lock cylinder on Passlock I and Passlock II systems. ( Where the key goes ), Good-Day!

Aug 27, 2014 | 1999 Chevrolet Blazer

2 Answers

Hello. I have a 2004 Monte Carlo SS. Just recently, I have experienced my car not starting. I have had ONSTAR do a Diagnostic test from my car, while I am in it, and it comes back fine. What happens is, I...


Read the following paragraph from GM, this will give you some insight on the passlock system on your vehicle.

The electrical switching portion of the ignition lock cylinder assembly is separate from the key and lock cylinder. The electrical switch portion and the key and lock cylinder synchronize and work in conjunction through the action of the mechanical assembly between the two components.

PASSLOCK(TM) SENSOR
The Passlock(TM) 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(TM) sensor by placing a large magnet around that area of the steering column. There is a tamper resistor inside the Passlock(TM) sensor in order to help prevent tamper to the system. Passlock(TM) 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(TM) sensor will generate a unique Passlock(TM) code. All 10 combinations of the Passlock(TM) sensor have the same part number.

BODY CONTROL MODULE
The body control module (BCM) contains the theft deterrent system logic. The BCM reads the Passlock(TM) data from the Passlock(TM) sensor. If the Passlock(TM) data is correct, the BCM will send a class 2 message to the PCM to enable the fuel injectors and crank relay.

During the tamper mode the vehicle may start. The vehicle will then stall. If the BCM receives the wrong Passlock(TM) data, the VTD system will immediately go into the tamper mode. The tamper mode will lock-out the vehicle fuel injectors and crank relay for 10 minutes . The SECURITY indicator will flash while the VTD is in the tamper mode.

If the Passlock(TM) sensor sends a correct password to the BCM when the ignition is in the ON position, the BCM will send a fuel enable and crank relay enable signal to the PCM.

SECURITY INDICATOR
The SECURITY indicator appears on the message center inside the instrument cluster. If the SECURITY indicator flashes or if the SECURITY indicator lights continuously during vehicle operation, refer to the system diagnosis.

POWERTRAIN CONTROL MODULE
The PCM communicates with the BCM over the Class 2 serial data line. When the BCM determines an incorrect password, it sends a Class 2 serial data password to the PCM in order to disable the crank relay and fuel injection system. If the BCM receives the expected voltage from the Passlock(TM) sensor, the BCM sends a class 2 serial data password to the PCM in order to enable the crank relay and fuel injection system. The PCM then allows the vehicle to start normally.

FUEL LOCKOUT CYCLE
The Passlock(TM) 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 ON position to the OFF position.

The Passlock(TM) system uses the lockout cycle in order to synchronize all of the Passlock(TM) components when any Passlock(TM) related part is replaced. The Passlock(TM) system requires 3 consecutive lockout cycles in order to complete the 30 minute learn procedure for a changed component.

CHANGING THE PASSLOCK(TM) COMPONENTS
The design of the Passlock(TM) system is to prevent theft even if the various theft deterrent parts change. The parts that can no longer be changed without the possibility of going into a tamper mode are:

* The Passlock(TM) sensor
* The BCM
* The PCM

If you replace any of these parts the vehicle may not start for 10 minutes . This is the long tamper mode. If this occurs, the system must go through a long tamper mode cycle. During this time the SECURITY indicator will be flashing for the full 10 minutes and DTC B3031 will be set. The BCM and the PCM require the full 10 minutes in order to complete a learn cycle. The ignition switch must remain in the ON position until the SECURITY indicator stops flashing. You will need to repeat the cycle if the ignition switch does not remain in the ON position. When replacing any of the above parts, perform the Programming Theft Deterrent System Components procedure.

The design of the Passlock(TM) system is to prevent the vehicle operation if the proper ignition key is not used in order to start the vehicle. The mechanical key, in normal operation, will turn the ignition lock cylinder. The Passlock(TM) sensor monitoring the position of the lock cylinder will relay the Passlock(TM) data to the body control module (BCM). The BCM will determine the validity of the Passlock(TM) data. The BCM will send a password to the powertrain control module (PCM). When the PCM receives the correct password the PCM allows the crank relay and fuel injectors to operate normally. The Passlock(TM) system requires the PCM and the BCM to communicate the various functions in order to operate. These functions transmit over the class 2 serial data line. For an explanation of the class 2 serial data description and operation refer to Data Link Communications Description and Operation in Data Link Communications.

Jul 19, 2011 | 2003 Chevrolet Monte Carlo

1 Answer

The security light came on my 2001 Chevrolet Express 3500 and stays on while driving. I don't even have a security system installed. Could this mean something else?


Yes you do have a security system. Its called passlock, and is more of an antitheft system than a security system. Actually you won't ever know you have it until someone tries to steal your vehicle or until it fails. Sounds like yours is failing. This link will help you understand the system and give you options to fix this yourself. http://vatspasslockpasskeysecurityhelp.yolasite.com/

Jul 01, 2011 | Chevrolet Express Cars & Trucks

1 Answer

Well driving my 2003 oldsmobile alero a light came on the dash (security) what dose this mean


Will the vehicle restart if it is shut off? The security flashing light usually indicates a passlock issue with the key or the passlock.

Sep 20, 2010 | 2003 Oldsmobile Alero

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I had an issue with the passlock system. The


did you have the BCM programmed to the new key? the dealer has to do that.

Jul 27, 2009 | 2000 GMC New Sierra 1500

1 Answer

Chevy Blazer 1999,car doesn't keep running after started ,car has Passlock


hmmm, sounds like an ignition switch problem. Not the tumbler/key switch, the ignition switch.

Jul 19, 2008 | 1999 Chevrolet Blazer

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