Update on 2. USB-port install. Currently I'm facing some connection issues
, that I need to resolve.
Setup:
1. Main Unit (MU): SW: 3Q0 035 844 A HW: 3Q0 035 844 A (factory installed in NA '17 GTI SE, old BCM)
2. Factory HSD wire from MU to factory USB-port in cubby. HSD-2 plug removed and replaced w/ HSD plug. GND wire isolated, 5V used as input for USB-Hub
3. USB-Hub 5G0 035 953 D. Modified factory HSD-cable to green connector. 12V (Battery) and GND from AC-unit, 5V from MU. Brown connector/HSD cable/cubby-USB-port, Purple connector/HSD cable/new 2. USB-port
4. Coding: Module5F/Schnittstelle für externen Medien: Aktivierung-Anschluss 2 --> aktiviert
5. Reboot of MU via volume knob
- Setup was working Friday night and Saturday on either USB-port w/ iPhone6s and iPhone12Mini
- On Sunday there was no successful connection except for (on both ports): Connection-beep (but Iphone doesn't charge) -> no CarPlay -> USB-reading. Constant loop until -> USB-error showed up on the screen. This seems to be a known issue (at least in Europe there are some reports about it). Ran out of time but a reboot of MU / reboot phone / ignore all connection on phone didn't solve it. No unknown faults in 5F via VCDS
- This morning, USB reading (music from phone) on both ports only. MU factory reset on Media and App, I was able to re-connect CarPlay to USB2 and it works w/ iPhone12Mini. USB1-reading, CarPlay screen starts but shuts down quickly, music via USB1 is possible
Every time I revert everything back to stock the cubby-port works as always. At this point I'm not sure if it is an issue w/ the MU. I've triple checked the power supply and even used a different USB-Hub instead. Have used different USB-ports / swapped HSD-cables / swapped lightning cables already, but it doesn't change the behavior. USB2 works, but USB1 as media only. Read somewhere about VW's CarPlay self-healing. Keeping my fingers crossed.