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Old 02-25-2021, 10:17 PM   #4
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 44,903
 

2003 L-Series 3.0L Sedan
Default Re: L200 2002 won't stay on running

A key to GMs Passlock security and whether its working or not is the yellow car with oversize padlock indicator. Seeing it turn on then off with all the other instrument panel lights/indicators when ignition is turned on lets you know Passlock is working. When the remote is used to Lock doors, this tells the body control module to lock doors and enable Passlock security - the security indicator will blink once every few seconds. Remote Unlocking unlocks doors and disables Passlock.

If Passlock fails its own power up self tests (during ignition ON phase) the bcm will disable it from interfering with everyday driving and leave the security ON at all times. When driving, it's usually off. When a theft attempt is made (without the ignition key), Passlock flashes security quickly while disabling injector operation - the starter can crank the engine until either the battery dies or starter burns out but the engine will never run with disabled injectors. The bcm sends a signal to the ecm/pcm to disable injector operation.

As long as Passlock security is off, Passlock isn't disabling the engine. When remotes fail, unlocking the driver's door manually and entering the car and quickly inserting the ignition key and turning it to the ON/RUN position will disable Passlock to allow normal starting and driving.
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