Hmm interesting. I've heard of people shorting out the electrical system to disable alarms this way when breaking into cars. Sounds risky.
I think the ECU has to run for the security system to enable which would allow the key fob signal to work or double left clicking the tumbler.
Quote:
Originally Posted by iansanderson
Hook 12V lead or a 9V battery to one of the license plate lights. Should energize the GM enough to unlock the doors using the key or tumbler on the drivers door.
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