How to disable passlock system on 2000 Chevrolet 2500 series truck,the security lights stays on continuosly

You can't. It has an anti-theft device. The days of boosting a car with a couple of wires ended in the 1980s! You have to fix the problem, not find a way around it.

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Where did you try to by-pass at , with the 2000 ohm resistor ? Is the SECURITY light lit on the instrument cluster ? Probably has another problem other then the key . The anti-theft system in your vehicle can not be by-passed by using a resistor .

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.

Your best bet , take it to a qualified repair shop . Before you render it unfixable . (cost to much )

There is a problem with the system an there is a DTC - diagnostic trouble code stored in the body control module !
The vehicle theft deterrent system is designed in order to prevent vehicle theft by disabling the fuel injectors unless the lock cylinder is engaged by the correct mechanical key. The theft deterrent system uses the following 4 components for theft prevention:
?€¢
The lock cylinder

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The ignition switch

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The body control module (BCM)

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The powertrain control module (PCM)

When starting the engine, the PCM searches for a password from the BCM through the Class 2 serial data circuit. If the password is not recognized or not present, the PCM will disable the fuel injectors. Two modes of tamper detection are provided:
?€¢
No password received

The engine will start and stall quickly. SECURITY telltale will flash on the instrument panel cluster (IPC) and then stay ON steady.

?€¢
Incorrect or disable password received (More than 3 invalid passwords are received)

The engine is disabled for at least 10 minutes and the SECURITY telltale will illuminate solid on the IPC during the 10 minutes.

After the vehicle has passed theft detection, the PCM will continue normal operation
Ignition Switch
The mechanical key and lock cylinder is located on the steering column. The main electrical switching portion of the assembly is separate from the key and lock cylinder. The VTD portion of the ignition switch is the Passlock?"¢ cylinder.
The Passlock?"¢ lock cylinder is a locking cylinder that turns a magnet past a stationary hall effect sensor. When turned to crank, the hall effect sensor is latched which applies a fixed resistance to the Passlock?"¢ signal data circuit. The voltage measured by the BCM on the Passlock?"¢ signal data circuit is the Passlock?"¢ data value.
Body Control Module (BCM)
The BCM compares the Passlock?"¢ data value to a value that it has stored in memory. If the values match the BCM sends a password via the class 2 serial data line to the PCM.
Powertrain Control Module (PCM)
When the PCM receives the correct password, the PCM enables the fuel injection system, allowing the vehicle to operate correctly. The PCM may allow the car to start and quickly stall during a failed theft condition.
If the BCM does not receive a Passlock?"¢ data value, the BCM will enter a short tamper mode. During this mode, the VTD system will not allow the car to operate for 4 seconds.
If the Passlock?"¢ data value is incorrect, the VTD system will enter the long tamper mode. In the long tamper mode, the following actions will occur:
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The THEFT SYSTEM indicator will flash.

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The fuel injectors will be shut off for approximately 10 minutes.

Although the vehicle may start, the engine will quickly stall due to a fuel cut-off.
In the event of an open in the serial data communication between the BCM and the PCM or a failure in the Passlock?"¢ lock cylinder, the following actions occur:
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The VTD system will become fail-enabled if the car has already passed theft for that ignition cycle (i.e. the engine is running).

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The PCM or the BCM may set diagnostic trouble codes (DTCs).

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The THEFT SYSTEM indicator will light continuously.

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The PCM will become fail-enabled for future ignition cycles.

If a failure occurs when the ignition is off, while the VTD system is not fail-enabled, the PCM will never receive a valid password, and will not allow vehicle operation by disabling the fuel injectors. An this system can set 6 DTC'S
DTC B2947 Security System Sensor Power CKT Low DTC B2948 Security System Sensor Power CKT High DTC B2957 Security System Sensor Data Circuit Low DTC B2958 Security System Sensor Data Circuit High DTC B2960 Sec Sys Sensor Data Incorrect but Valid DTC B3031 Security System Controller in Learn Mode DTC B3033 Security System Indicates Tamper

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/

This is likely a problem with the passlock 2 system created by gm which has had many complaints but never has been recalled. Place key in ignition, turn to ON Position. (do not start). Leave in ON position for Exactly 10 minutes. The light will shut off, Immediately start the vehicle once the light is off.

it could be the passlock system ( anti theft system ). heres how to find out. all gm vehicles from 97-2005 contain an anti theft system called the passlock. on chevy malibu turn key on, let it stay on for 10 to 15 minutes. then turn ignition off, take out key from ignition, after 1 minute start the car. thats if its whats wrong. if this is your problem you can disable system for good ! go to www.tubesound.com/passlocksystem hope this helps,

to disable theft system or passlock. if you have a computer go to tubesound.com for instructions on fixing problem. when on page, type in problem on the top of page. this page will tell ya how to disable system. tubesound.com/passlock system. disables passlock system for good. all gm to date,

Eliminating the system is harder than it sounds. The Passlock reciever located in the ignition lock cylinder are famous for giving this very problem.

No, it can not be disabled.
The theft system is indicating a short term theft issue.
Have you added any "after market" remote start systems or alarms?
If NO.
Insert the key in the ignition, turn the key to run position ( do not start ) and leave it in that position for 10 minutes. Cycle the key to LOCK position, count to 10, then turn the key back to run position and leave on for 10 more minutes. After the 10 minutes is up, repeat the procedure (1) more time and the security system will relearn the PASS code.
Give it a try and let me know.
Regards,

Disable the passlock system permanently. The other functions will still work just fine. The passlock system for some mystery reason sometimes senses an intrusion even if there is not one and locks down the fuel injectors. Underneath the steering column there is a metal plate held in place with a few bolts. It needs to come out. In order to do so you may have to remove some dash components but it is not as hard as it seems. Once the plate is removed running up the steering column there will be (3) wires bundled or tied together. These are the wires for the passlock system (Yellow + Black - and White neutral) It is the only group of 3 configured like this. START the car and while the car is running snip the YELLOW wire ONLY! and tape off the ends. Put everything back together and live better knowing your car will now start each and every time. The Yellow or Orange security light will stay on permanently but this will not cause any other problems.