Hello, I did a lot of search and saw some similar problem reported but could not find the solution unfortunately. I have a databus error in my setup after recent retrofit work. 01305 - Databus for Infotainment 004 - No Signal/Communication - Intermittent Here is where I started: 2002 allroad with Symphony II, Bose, OnStar. Over the course of several years I did the following: - retrofitted the OEM BT module in place of OnStar - everything worked fine (several years) - retrofitted Dension Gateway 100 iPod interface. First simple version and later replaced it with CAN version. Everything worked fine for several years. Song info on DIS was nice - retrofitted OEM Sirius Sat radio. Wired it using the stock CDC harness in the trunk, preserved Dension by splicing the Audio based on Teddy's and NSX jr write up. Everything worked fine. - retrofitted shark fin antenna from 2005 allroad - retrofitted RNS-E with universal wiring harness adapter. Ran a GALA to the back of the cluster, ran RFSL wire to A-pillar (although I heard it's not necessary since my RNS-E unit is 193B) - replaced old Sirius unit with the newer Sirius/XM module (single FAKRA, used the dual to single FAKRA y-cable) - then I had an itch and wanted to get an CAN AMI to replace the Dension Gateway. Since that was also gonna free up the CDC interface that Dension was occupying I decided to retrofit the OEM CD Changer - I did direct swap of Dension for CD Changer (built a custom harness and tapped into the appropriate wiring where the original CDC connectors were supposed to go) and built a custom AMI harness (very simple, 3 audio leads to 32 pin connector and 4 more wires directly to CAN and power/ground) What resulted in this work is the communication issue with Sirius, I can intermittently connect to it via VCDS but the connection is bad and intermittent and the module itself gives a message to RNS that this is simplified installation and tries to initialize to no avail. AMI works as an AUX but not recognized by RNS-E (I can't recode RNS-E since I need to downgrade the software from my current version 230, but that's the separate issue). CD Changer is powering up and lets load CDs but is not recognized/seen by RNS-E - I suspect due to CAN comm issue with SAT. To understand the situation a little better. I checked and rechecked the wiring, I even totally re-wired, chased every wire/pin from RNS-E to the car harness and got rid of all the old connectors and wired RNS-E quadlock directly to the car harness. As far as CAN: VCDS sees the phone (OEM BT) - no problems/codes. DIS sees the phone book, MFSW works and operates phone just fine. SAT displays Initialize/CAN on the DIS AMI (in current config as AUX) also displays AUX on DIS Any pointers to troubleshoot the Databus issues? Thanks!