Ya that would be your vats huh .
This document below may help may not. I also did a crank relearn procedure before I tried starting it. Its similar to this but little different .
GM Document ID 835015 helps you with this one.
You must perform a theft relearn procedure if any of the following components have been changed.
PASSLOCK TM
BODY CONTROL MODULE
POWERTRAIN CONTROL MODULE
The above modules, with the exception for the PASSLOCK Sensor must also be programmed with each module's own vehicle configuration. See the individual module service manual section.
Auto Learn:
Time required, approximately 10 minutes
1. Insure that the battery is fully charged.
2. Use the.........
That info seems to be for a 1998 Chevy Malibu, probably from
http://www.bobstractorpartscorner.com/passlockrepair.htm ?
To the best of my knowledge, passlock on a GMT400 generally requires a 30 minute proceedure............
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PASSLOCK REPROGRAMMING AUTO LEARN
IMPORTANT: If a new vehicle/powertrain control module (VCM/PCM) is being installed for the first the manufacturing enable bit will be set and the auto learn procedure may not be necessary.
The following procedure allows for anyone to reprogram the EVO/PASSLOCK module learned data code with any tools, other than the scan tool, when any of the following parts are replaced:
The EVO/PASSLOCK module
The PASSLOCK sensor
The VCM/PCM
The EVO/PASSLOCK module will set the DTC B3031 in the learn mode when entering the reprogramming procedure.
IMPORTANT: Erase the PASSLOCK related Diagnostic Trouble Codes (DTCs) that are stored in the VCM/PCM.
The following is the Auto Learn Procedure:
1. Insure the ignition key is in the ON position.
2. Clear all EVO/PASSLOCK module and VCM/PCM DTCs.
3. Momentarily rotate the ignition key to the CRANK position (Do NOT start the vehicle), then release it to the RUN position (Do NOT key OFF in the process).
4. Wait 10 minutes . Observe the SECURITY indicator. Refer to the following list for the appropriate responses:
-If the PASSLOCK sensor was replaced the SECURITY indicator will flash for the 10 minutes duration.
-If the EVO/PASSLOCK module was replaced, the SECURITY indicator will flash for a few seconds and then remain ON for the remainder of the 10 minutes duration.
-If the VCM/PCM was replaced with a new programmed VCM/PCM and connected to the vehicle for the first time, the vehicle will start and this procedure may not be necessary.
-If the replacement VCM/PCM was connected to any vehicle at any other time, even momentarily, the SECURITY indicator will flash for a few seconds and then remain ON for the 10 minutes duration.
5. The SECURITY indicator will transition from flashing to ON briefly to OFF after 10 minutes if remaining in the ignition ON position.
6. Turn the ignition switch to the OFF position and wait for 10 seconds .
7. Repeat steps 3-6 two more times. The new security code is ready to be communicated among the PASSLOCK sensor, EVO/PASSLOCK module and VCM/PCM. The new password is learned on the next ignition lock cylinder cycle from OFF to CRANK to ON (start attempt).
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I should have been more clear in post number 4, my apologies.