Pioneer M-BUS

I have an old DEH-M990DSP that I bought new in 1994/1995 timeframe. I needs repair, but I bought a new faceplate in 2005, and it's been in storage just about as long.... I hate to bump an old thread, but no one can say I didn't search! Lol.. I'm also looking for the M-buss wiring diagram so that I can emulate a CD changer and utilize the M-buss as an aux input for Bluetooth to play Spotify in my old 1991 Nissan Sentra SE-R. I could just go with a newer model deck, but I have a love for this unit... I'd rather pay $1000 to get it fixed and to get Spotify streaming on it than buy a new unit for $750.. if you know what I mean. Not that it'll cost that much. But I definitely want a period correct pioneer head unit in the car. 🙂 Thanks anyone who's still subscribed to this forum.
 
hello
there are 2 pioneer ip bus adapters in aliexpress
Audio Aux-in ip-bus.jpg