Car will not stay running security system light is on

I would suggest doing a battery disconnect for 10 minutes and see if this will reset the system.

If this doesn't work, here are some general tips to disable this.

https://www.2carpros.com/articles/how-to-reset-a-security-system

If this doesn't work then we need to scan for codes and see what is there.

Hi,

I'm not sure exactly happened. However, try this passlock reprogramming. However, it will require a scanner. If you jump to the second set of directions, where it says auto learn, that will get you through the process without a scan tool.

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1998 Oldsmobile Achieva V6-3100 3.1L MFI VIN M
PASSLOCK Reprogramming Auto Learn
Vehicle Accessories and Optional Equipment Antitheft and Alarm Systems Service and Repair Procedures PASSLOCK Reprogramming Auto Learn
PASSLOCK REPROGRAMMING AUTO LEARN
PASSLOCK REPROGRAMMING AUTO LEARN

IMPORTANT: Due to component variability, the vehicle theft deterrent (VTD) system must have the learn procedure performed regardless, if the vehicle starts on the first ignition cycle after a VTD repair.

You must perform a theft relearn procedure if any of the following components have been replaced:
* Passlock Sensor
* Instrument Panel Cluster (IPC)
* Powertrain control module (PCM)
The above modules, with the exception for the Passlock Sensor must also be programmed with each module's own vehicle configuration.

AUTO LEARN
Time required, approximately 10 minutes:
1. Insure that the battery is fully charged.
2. Use the scan tool in order to clear the DTCs.
3. Turn the ignition switch from the OFF position to the CRANK position attempting to start the vehicle. The vehicle will start and then stall.
4. Leave the ignition switch in the ON position while observing the security indicator.
5. When the security indicator turns off, which can take up to 10 minutes, turn the ignition switch off. Wait 10 seconds.
6. The BCM and the PCM will learn the new code on the next start attempt.

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Let me know if this helps.

Take care,
Joe