I recently have the "Battery Protection" message and I searched around the net and I found that we can have the voltage showed on the dash. I dont know if it has been posted before but I just want to share what I have found and if possible, tell me the voltage you are getting from the display, therefore I know if it is my alternator going bad, thanks guys.

1. Turn your key to position 1
2. Briefly press the "R" button 3 times
3. You should have the current voltage shown

It will show as an extra manual and you can start your car with it and keep reading the voltage. It will gone if you turn off the car and the next time you want to see the voltage, just to the steps again. The extra manual also showing the engine oil level when engine on as well as the VIN.



Key in Position 1


Idle

 

Depending on the ambient temperature, I typically see 11.9-12.2 volts before startup with key in #2 position, 10.1-10.5 volts while its cranking, and right at 13.9 while the engine is running. I've also found that the voltage displayed is typically .2 volts lower than the actual voltage measured at the battery for whatever reason.

 

this is the dynomode menu

you can see engine oil level, chasis number, turn off ESP. reset service, etc

 

...and you can also monitor the voltage via the heat/ac control.

 

i cant, not matter which method i use, that hidden menu does not pop.

 

^^Ali is your car an 06? Mine is and I discovered the button to do the trick on my 06 is to hold the driver side auto button for a while (5 or more seconds i can't recall).

 

mine is 2005, i tried every way mentioned in the forums but nothing, i noticed also all my friends who has 2005 also cant see it.

one my friends has 2006 and it shows by AUTO button.

 

Trying to access the Service menu to reset the service indicator but having hard time getting Voltage displayed in the instrument cluster ? Any ideas as to how to get Voltage displayed. It's an '06

Thanks

 

Interesting...I have an 05 and it works great. It must be in the MPH/TEMP display for it to work though.

 

This method works on my 07 E63, it is the same process used to reset your oil service (FSS Reset)

 

I'm having the same thing but my car, won’t start!