I need to reset the car because my navigation is going a little haywire and my mechanic suggested I reset the system by unplugging the battery for 20 minutes and then plugging it back in. However, I cant seem to figure out how to do that.How do I unplug the battery in a 2000 BMW 540i?Your mechanic used the wrong terminology. You don't unplug a battery. You disconnect it. You want to remove the negative cable off your battery. Loosen up the clamp that holds it on the post with a 10mm wrench, then pull the clamp off the battery post.
Do not remove the positive while the negative is connected, and do not let the wrench touch the positive while the negative is connected. Your battery is in your trunk on the right side. Usually the positive has red wires and the negative is black. It is under some trim panels.
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