Video Overview

A video about checking battery voltage in BMW E39

Turn OFF Car.
  • Turn OFF Car.

  • Turn ON high Beam headlights for 5 minutes. This removes the surface charge for proper testing.

  • Turn OFF High Beam headlights.

  • Press and hold the Check Control button in the instrument cluster (RIGHT button), and turn the ignition key to the first position (KLR).

  • You will first see "Check Control OK", some seconds later you will see "Test Nr.01".

  • Select Test Number 1. by Pressing the left button on the instrument cluster to see the car's identification number. Add the 5 digits (not 6)

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Add up the digits Example: A123457 will lead to 2+3+4+5+7 = 21.
  • Add up the digits Example: A123457 will lead to 2+3+4+5+7 = 21.

  • Push the right button until you see "Test Nr.19".

  • Enter the total amount calculated above into this menu item using the LEFT button. When complete press the right button again. This will unlock your instrument cluster giving you full access to all of the test modes

  • Using the left button select Test Number 9. System Voltage.

  • Press the Right button to select. Your battery voltage will show on the High Cluster until you turn the car off again


To reset turn off the ignition.

4 other people completed this guide.

Attached Documents

Martin Bishop

Member since: 01/26/2012

3,728 Reputation

16 Guides authored

I didnt have to unlock or turn off my car for it to work. Anyway, nice tutorial!

Madis Anton - Reply

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