CM871 to CM570 Odometer Issue

[e30rik]

Hey all, I just bought a 2009 W900 that originally had a CM871 ISX that was swapped with an older ISX dated 2002 which is a CM570 I guess? Anyways, the first issue I'm having is that the odometer isn't reading any mileage. The display for the odo is lit but only shows dashes "------" while the truck is running. However, it does show mileage when the truck is off but I don't think it ever counts past that reading. Is there any way to get the odo ticking miles? The PO and his mechanic were unable to figure it out but hoping for any info on this. Thanks