Do you have a security light lit or flashing on the Instrument cluster ?
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 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:
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The ignition lock cylinder
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The ignition switch
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The passlock?"¢ sensor
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The Body control module (BCM)
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The security telltale
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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:
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The security telltale will be ON continuously.
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The VCM/PCM will become fail-enabled for future ignition cycles.
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The VCM/PCM will never receive a valid password in order to enable the fuel injectors.
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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.
SOURCE: how do I replace ignition
Insert key, turn to off position, insert small pin/ paper clip into hole under cyl.
Pull out cyl assembly.
SOURCE: i can't get my key to turn in my 2000 chevy
Try spraying some lock lubricant in to the ignition lock and placing the ignition keys in to it and see if that helps. If it doesn't turn, give the end if the ignition key a tap with a small hammer or the but end of a large screw driver while it's in the ignition lock.
This should work to make it turn, then drive it to a lock smith that can replace your ignition lock, or to the dealer. This hope will help you get the Suburban started so you don't have to tow it to save you the tow charges.
Thank you for suing fixya and good luck.
SOURCE: I have a 2000 GMC
You can drill it out. I have had to do this on 2 occassions. First...pull the cowel off around the steering wheel. Get a good light and look closely...some of the screws in the plastic can really hide on you. With cowel removed....look for and opening (small hole) where a little pin sits. Grab a very small screwdriver or pick and push down on that pin while you wiggle the key and try to turn it to the "on" position....you are supposed to put it in the "on" position in order to push the pin in and pull out the cylinder, but you may have some luck seeing as though the tumblers are broke inside. If this doesn't work...you may be drilling it out. Check with dealer too. If you have a plastic top on you key...and a security light and your car....a NAPA or Auto Zone part is not gonna work. You need to buy a key lock and cylinder assembly from the dealer and follow the key up procedure to reprogram the new key to the BCM. when you get a little further into getting it out...I can walk you through getting it in
SOURCE: replaced ignition cylinder now starter won't engage
Get a meter and see if starter is getting 12 volts,if not,your inline fusible link is blown.
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