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I'm not sure if this is what you're asking about, but GM has had the feature "Retained Accessory Power" on most of its vehicles for at least five years; longer on some models. RAP keeps the vehicle's electrical system powered up for 10 minutes after the ignition is switched off or until a door is opened, whichever comes first. You can shut the engine off but still listen to the radio, operate the door glass or sunroof and run the wipers with the ignition lock in the "off" position. It isn't just like having the lock in the "Accessory" position because that only powers a couple of electrical accessories.

They also have "Battery Rundown Protection" which automatically shuts off any electrical load that was switched on manually - headlamps, for instance - 10 minutes after the ignition was switched off or a door was opened. Basically, when RAP times out, BRP kicks in.

Ed
 
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