95 525 i Problem

[wishihad50k]

Can anyone help me???????????
I just bought a 95 525i and the on board computer (next to the radio) does not work.... everything else works fine (radio, heat, air, etc.) but when I go to hit the 0-60 or the temp or anyother button on the comp nothing happens in the display. I called the guy who sold it to me and he says it just needs a new batt. in the on board comp. ?????? If this is the case how do I change the batt.? Also when I start the car up, on the gage cluster under the speedo a digital bar comes up that has like 10 little spaces that go from green to red. WHAT IS THIS?????
Sorry, I am a newbie!
thanks guys!

 

[Nefestus]

The bar you mentioned is oil control- the more green bars, the better. They will disappear one by one as time goes, until only yellows and reds are left, which would be a good time to change oil.
As for the comp, it does not have any battery. May be there is a problem with the wiring or something... Anyway, those onboards are not hard to find (used), and they are rather cheap (at least where I come from).

 

[CosmosBlack]

The light bars are actually "service indicator" lights.
Yellow means Time for service...(which does include oil change)