1989 635csi service interval batteries

[ytr1903]

I am getting ready to replace the odometer gears in my E24. I figured that as long as the dash is apart, I might as well replace the service interval batteries if there are any in the 1989 model. I checked the ETM to see if there are any, but didn't see a reference. Can someone tell me if there are batteries? Thanks,
Tom

[SprCpe]

I had my 89 apart for gears some time back. I didn't see any on mine. I keep hearing about them but never did find any. Hope that helps you.

[ytr1903]

Thanks for the reply, Spr Cpe. I tore into the dash this morning and discovered that you are correct. There are no batteries in instrument pod. Odometer is fixed and ready to go. I wonder how the service interval indicator retains the information without backup batteries.

[dmac156]

You probably have the board without batteries, it uses capacitors. I have one in my car. They are available on Ebay.

[OldGringo]

If you do have the batteries, there will be two of them, as components on the main circuit board. They have to be removed with a soldering gun and de-soldering braid.