Well, I got the X5 back in play after a LOT of search and effort, but like all good E53 owners, we know the fat lady ain't sung. So, I am watching and waiting.
My theory evolved to proving a module on the bus was chatty and causing 'noise' that kept the IBus interface from talking to the LCM. While I did order ride height sensors, I only ordered one front and rear so we didn't put 'em on.
I decided not to change *anything* with the iBus connection for this next move so I could discern if a failing iBus interface was the *cause* of all the SLS errors I'd been having. I figured if the interface even worked, it would tell us that the pump we replaced was the chatty Kathy on the bus.
But the 'refurbished' eBay pump is in the truck. This may have been the culprit. The ride is now *much* more subtle, even lowered.
The radio had been disconnected this whole time. I simply pulled the fuse I'd tapped for the iBus Interface- it was the same as the radio. I'd ordered 2 Reisler's for this project before we picked up the white one. (or even *knew about* it) Turns out I didn't need either one of them. When I returned home this morning after all the work, I plugged in the radio, navigated to the app and attempted to register. While it had failed with the SLS errors, it went through today!
My iBus interface is back with full function! I was even able to connect and program the LCM. Also, the app is communicating to the LCM to power AEs and fogs as DRLs. And the only thing I changed was the OE EHC air pump. Let's see how long it lasts!
