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Is it a single line-out to the amp or is there one for each speaker? I’m thinking pinched/damaged wire given it was intermittently working initially. Sorry, this happened; good luck!
I agree. This only happened because I was installing something next to the head unit. I either pinched a wire or shorted the amp for a second.
The hardest part for me at the moment is figuring out what wires are what and where to test them. They should have more clear instructions.
In an effort to start cleaning up everything before I was going to take it to Lexus to have them diagnose the issue, I adjusted some of the wires near the bottom of the center console, and the music magically came on. I froze for a good 20 seconds and thought really hard about the last few moves I made. I retraced my steps and found a wiring bracket at the bottom of the center console area to be the culprit. Here's an image that shows the bracket and harness.
It never occurred to me to test this bundle of wires because they were at the bottom of the center console, and I didn't touch them during the installation of the BeatSonic device. It turns out they are audio wires, after all. The gray one on the left was the problem; it wasn't making a good connection, so I used some electrical tape to make sure it sits firmly in its socket. Pretty sure it was the MOST communication connection to or from the AMP.
FYI, everything on that bracket is an audio wire, and if you unplug any of them, you'll lose audio.
If you have this problem yourself, know that it's entirely possible to run a diagnostic, and the MOST network says everything is OK, but then run another scan using an OBD2 scanner and have it report a B15D0 code. You'd think it would show in the self-diagnostic but it doesn't.
Anyway, thanks for everyone's help. I'm glad I could report a fix.
Oh, and one last thing, the BeatSonic customer service is fantastic. Eric over there helped me a ton while I was losing my mind trying to solve this problem. Those guys are pros, and you shouldn't hesitate to buy their carplay unit, it works like a charm.
Check the MOST connection either under the cup holder because it can get wet and or corroded. Also check the harness connectors by the passenger side kick panel. It has MOST and audio wires there also.
Remove your center console and dig into the wires until you find that bracket circled in the picture above, and give it a giggle. It could be the culprit.
