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Battery Problem Diagnostics

Model: BMW Serie 5 E39 - Years 1995-2003
Part: Onboard computer

This video shows how to check for potential issues related to the battery warning light on a BMW 5 Series. These operations are performed using the onboard computer. First, check that the vehicle's voltage is correct: press the button on the onboard computer for about ten seconds until the word "test" appears, then continue pressing the button until the number 19 is displayed. The ON/OFF indicator will continue to blink alternately, so press the button to lock the display on OFF. Next, set the TEST display to number 9. This will allow you to verify the vehicle's voltage. When you turn off the car's ignition, the voltage number will appear on the display (in this case, 124). Once you have verified the voltage, check if the issue is related to an intrinsic problem with the battery.

Updated on 10 February 2026 by ScegliAuto

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