Question about 2000 Cadillac Catera

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  • oglesby_jack Sep 27, 2009

    You have described a lot in detail....but what should I do?

  • oglesby_jack Sep 27, 2009




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To remove the theft code you need to have car towed to a dealer and have them remove it on there computer. They have a theft code over ride computer. You will also have to show your Id and show proof of owner ship of the car. Every dealer is difrent in what form of proof that they want. You might want to call a dealer first to see what they want as proof.

Good Luck

Posted on Sep 27, 2009

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As long as you did not damage anything you might be able to have it relearned however I have seen many many aftermarket remote starts cause this on GM vehicles. The only way were ever able to solve it was the remove the system and reset the system. The passlock system is very picky making it a great system till you want to alter it. If you are interested you can contact your dealer or a authorized gm accessory site. GM offers a factory two way remote start. It also shows the last command performed using your remote transmitter (e.g. locked doors, remote start engaged, etc.) as well as important vehicle data, including remote start count down timer, tire pressures, fuel level, and odometer and has a greater operating range than the factory remotes.

Here is the description and operation on the system:

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 previously 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 PASS-Key® 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)
Ignition Lock Cylinder and Housing

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.
Ignition Switch

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 ignition cylinder lock housing. 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.

Body Control Module

The Body Control Module (BCM) contains the theft deterrent system logic. The BCM reads the Passlock™ data from the Passlock™ sensor. If the Passlock™ data is correct, the BCM will pass theft. The BCM will then transmit the fuel continue password to the VCM/PCM.

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

If the Passlock™ sensor sends a correct password to the BCM when the ignition is in the ON position, the BCM will send a fuel enable signal to the VCM/PCM. The VCM/PCM will not disable the fuel due to any BCM message for the remainder of the ignition cycle.


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.

Vehicle/Powertrain Control Module

The VCM/PCM communicates with the BCM over the Class 2 serial data line. When the BCM determines a no start condition, it sends a Class 2 serial data password to the VCM/PCM in order to disable the fuel injection system. If the BCM receives the expected voltage from the Passlock™ sensor, the BCM sends a class 2 serial data password to the VCM/PCM in order to enable the fuel injection system. The VCM/PCM then allows the vehicle to start correctly. If the Class 2 serial data password from the BCM to the VCM/PCM is not within the Vehicle Security Status Message, the fuel injectors will shut OFF during a start attempt. The SECURITY telltale will be illuminated for 10 minutes. If the VCM/PCM does not receive the same password from the BCM as the last learned one, the vehicle will start and then stalls due to the Fuel Lockout.

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.

Changing the Passlock™ Components

The design of the Passlock™ 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™ sensor
• The BCM
If you replace any of these parts the vehicle may start and stall 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 telltale will be flashing for the full 10 minutes and the DTC B3031 will be set. The BCM and the VCM/PCM require the full 10 minutes in order to complete a learn cycle. The ignition switch must remain in the RUN position until the SECURITY telltale stops flashing. You will need to repeat the cycle if the ignition switch does not remain in the RUN position. When replacing any of the above parts it is recommended to perform the Programming Theft Deterrent System Components procedure.

Posted on Sep 26, 2009

  • taran_2005
    taran_2005 Sep 26, 2009

    The design of the Passlock™ 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™ sensor monitoring the position of
    the lock cylinder will relay the Passlock™ data to the body control
    module (BCM). The BCM will determine the validity of the Passlock™
    data. The BCM will send a fuel continue password to the
    vehicle/powertrain control module (VCM/PCM). When the VCM/PCM receives
    the correct password the VCM/PCM allows the fuel injectors to operate
    normally. The Passlock™ system requires the VCM/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.

    Hope i helped you.

    Thanks for using ' Fixya ' and have a nice day!!


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Your car thinks it has been stolen. This could have been caused by a number of reasons. If you bought the car used and recently, you really should talk to the police about this. I believe you can look up the car's history for free on . If you've had the car for a while and this happened randomly, it might have been caused by the security system, or a random component of the car failing. You can try looking in the manual to see if there's a way to turn the security system off or reset it. If there's not a reset feature try turning the security system off and then turning it back on. And when I say turn the security system off, you'll probably have to do something weird like open and close the door 4 times and turn the key on and off three times or something. But turn it off and back on or reset it. You could try resetting the engine computer. I would imagine that if your car is locked in theft mode, you might need to have the government or dealer clear that for you.

Posted on Sep 26, 2009

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Hi Missy , There are a number of thing's that can cause this . Fuel system problems , ignition system problems , the PCM - powertrain control module , the PCM is the engine computer ! There are multiple sensors on this vehicle as with all cars for the 80's on . From 1996 on they have more electronic modules then before , Anti-theft systems , air bags, anti - lock brakes etc.
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After you put in the ecu, do the crank relearn, everyone knows how to do that since its common knowledge, and you're good to go.
Here is how it's done: Ensure that your battery is fully charged before attempting the relearn procedure. Do not leave any battery charger or jumper cables attached to the battery. Close the hood completely. Some applications require that the doors remain closed during the procedure.
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1. Rotate the key to the start position to attempt to start the vehicle (the vehicle will not start).
Allow the key to return to the all position (same as if the vehicle would have started). The theft system light will flash (or stay lit) on the dash for approximately 10 minutes.
2. When the theft system telltale stops flashing (or turns oft) turn the key to the off position for 5 seconds and then attempt to start the vehicle. The vehicle should start on this cycle.
3. Once the vehicle is running, the password relearn is complete.

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1. Rotate the key to the start position to attempt to start the vehicle (the vehicle will not start). Allow the key to return to the on position. (same as if the vehicle would have started)
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4. Repeat steps 1 through 3 two more times for a total of 3 cycles/30 minutes.
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