What you need
Video Overview
A video about checking battery voltage in BMW E39 http://www.youtube.com/watch?v=X58-VwLCC....
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Turn the ignition key to the first position
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From the Main menu screen select SET using the right rotary button
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Press and hold the MENU button for approx 8 seconds
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Select the Desired menu item from the Navigation Service mode
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To exit Service mode, press the MENU button
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Almost done!
To reassemble your device, follow these instructions in reverse order.
Conclusion
To reassemble your device, follow these instructions in reverse order.
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