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      08-27-2010, 05:18 AM   #12
Technic
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Drives: 2015 320i
Join Date: Apr 2005
Location: Ft Lauderdale, Florida

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2004 M3  [0.00]
If your battery is in good charge condition then just push the volume knob on the radio and it will turn on without any key anywhere, the car running or in ACC. It will stay on until the car ECU detects a battery low charge or for around 20-25 minutes, whichever happens first.