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Old 11-21-2005, 08:57 PM
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BNaylor BNaylor is offline
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Re: Re: 1997 grand prix..heater motor starts on its own at nite

Quote:
Originally Posted by regalfriend
A side question....i hear about these cars having rundown protection...How does it work?
It's called Battery Rundown Protection. The accessories such as interior lights, exterior lights, etc. draws a lot of parasitic load on the battery if left on. The body control module (BCM) in conjunction with the retained accessory power relay (RAP) turns off lighting and accessories after 10 minutes so the battery does not drain.

Also the BCM goes into sleep mode to minimize current draw or parasitic load. Normally, if there is more than 25mA of current draw, it will kill the battery overnight. But it depends on the reserve capacity of the battery. If reserve is 120 divide by 4 = 30mA. Parasitic load should not be over 30mA.








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u-bend delete, 160 TS, ZZP Stage 1 72mm TB,
TB spacer, MSD 8.5mm wires, Autolite 103,
Goodyear Gatorback Serp. & SC Belt,
Nitto NT555R Drag Radials

1/4 ET: 13.210 sec. @ 104.490 mph
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