Final Stage Resistor?

[NBX]

Hi to all!

I have a 2000 X5 4.4i, 73000 miles.


I get the battery warning signal on the display - But only when the fan or AC is on. When the fan or AC is off, the battery display goes away. I checked using the Peake Tool and I got:

1A = Control Unit Supply
A4 = EVAP Barometric tank pressure sensor

Any clues? Is it the final stage resistor? A few days ago, I noticed that "smoky" air was coming out of the front central vents when the AC was on. Is this related?

The battery is about 4 years old - the second on my X5.

Please, any help will be appreciated.