I expected to see an AUD in the ECU Tools pull down menu but there is none, even after doing Update Profile to read all connected ECUs. 2024 XC40 with stock HP amplifier under the seat working fine.
What basic stuff am I missing/doing wrong here? Screenshot attached.
The AUD has not been found by OrBit. Usually that means the module (AUD) is not responding to diagnostics. This happens, where a module "works" fine in the car, no apparent problems, but it's also not responding to diagnostics.
What you can do:
When you update the profile, make sure to choose YES to the question about finding new ECUs (So OrBit will look for and add modules not previously found, i.e. not already in the list on ECU Tools tab)
If you still don't see AUD show in the list: Reset the IHU - From the ECU Tools tab there, select the IHU, then click the "Reset ECU" button. This is like a reboot, nothing is lost the infotainment will just restart. Then try update profile again (same as above) and see if the AUD finally shows up. The AUD communicates through the IHU, so sometimes it is an IHU issue why the AUD is unreachable over diagnostics.
If that fails, you might either: Disconnect/Reconnect 12V battery OR unplug/replug all cables to the AUD. Whatever de-powers it and re-powers it again, like a "cold start" and then once again, update profile as above, and see if the AUD shows up in the ECU list.
I tried resetting the IHU as well as disconnecting the battery (with full profile updates) without result. What worked was to disconnect and reconnect the MOST fiber - after that the full profile update found the AUD, hurray! Makes some sense I guess, assuming the fibers carry control signaling as well as the audio packets and the IHU would act as an CAN interface for the AUD (or is ECU communication using Ethernet rather than CAN?).
No, not at all.
IHU is LIN (master), Flexray and MOST ECU. It does not communicate through CAN bus or ethernet.
MOST has its own protocol and data flow is only 1 way. Like a bunch of bulbs are connected in serial. The MOST cable has two fiber optic, one in and one out. That's why when a MOST ECU is disconnected from the network or faulty, a bridge must be used replacing the removed or faulty ECU. VOLVO has only two ECUs with MOST. IHU and AUD. In your case, you might have glitch in the system or the cable was out missing some messages like the diagnostic messages.
