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Are you getting any DTCs (Diagnostic trouble codes)? Do you have a copy of the Electrical Diagnostic manual for your bike? If not you can purchase one for download if you google motorcycle manual download (we aren't allowed to link to this site). That manual will give much more detail on troubleshooting codes and procedures. I've gone through mine and from what it sounds like you are doing so far you might have to swap the voltage regulator, or even the radio itself, on speculation if you are unable to determine the cause of this issue.
This is the sound router between the (wired) headphones and the speakers. The problem is that, after start the engine, the speakers do not make sound. It doesn't matter what the source is (USB, BT, radio or phone), but the source works because if you choose to output the audio through the headphones it sounds fine from all inputs. What confuses me the most is that it is not always, it fails on some occasions and so far I have not been able to find a pattern.
This "sound router" sounds like the problem, loose wiring inside that is worse when the bike is running
Check the radio display when the issue happens. Look specifically at the status bar at the bottom of the screen.
There a 3 possible radio function causes for intermittent loss of audio:
WX band in weather alert mode
Intercom in VOX mode & active
CB in transmit (not likely but possible)
STATUS BAR
See Figure 23.The status bar is at the bottom of most screens.
It displays the clock and status icons. The icons are informational and are not
selectable.
The WX alert function:
I'd suspect item 2.
If this doesn't resolve the issue, then you may have an intermittent wiring problem?
Are you getting any DTCs? Have you gone through the troubleshooting steps in the Electrical Diagnostic manual? Have you taken the bike to a Harley technician or a mechanic with the appropriate diagnostic tools and skills?
This is obviously a reproducible problem. It does not seem intermittent.
I can't think of any configurable option in the radio or Digital Technician that will cause this behavior. I believe you will find this related to the voltage regulator, BCM, or radio itself but you will likely need to swap them out 1 at a time to determine which is faulty.
There's nothing more I can suggest and I've suggested all of the above before here and in PMs
Good luck, I hope there is a relatively simple solution to this issue.
I'll look up the DTCs in the afternoon and if I see anything I'll post it. I don't have the electrical diagnostic manual, only the service manual.
I have not taken it to an official dealer, because I do not have one near where I live, and I have always liked to repair and manteinance my vehicles. In this case I think I have it difficult.
Thank you very much Hamah, I will tell you how it ends.
I'll look up the DTCs in the afternoon and if I see anything I'll post it. I don't have the electrical diagnostic manual, only the service manual.
I have not taken it to an official dealer, because I do not have one near where I live, and I have always liked to repair and manteinance my vehicles. In this case I think I have it difficult.
Thank you very much Hamah, I will tell you how it ends.
Google "motorcycle-manual-download". Perhaps add a ".com" to your search criteria. Buy a digital version of the manual. They sell unauthorized copies of Harley manuals so we are unable to link their site directly to you. It will provide all the steps a Harley technician will use to diagnose the problem.
The only difference will be that they have the tools and access to spare parts and factory support that you don't (well, you can get something like the Technoresearch Centurian Pay-Per-Bike to replace the Digital Technician II but the breakout is difficult to replace).
Unfortunately, all of the parts I suspect could be involved are electronic so you can't return them if you wanted to swap them out one at a time. Perhaps you know someone with a similar bike that would help by letting you swap out parts to figure out where the problem is?
I did the procedure to see the errors that the bike showed. I did it without the tourpak in place and it gave several, I understood that related to the wiring of the rear controls and speakers being disconnected. I placed and wired the tourpak and cleared the errors. But one remains:
DTCs
1351:0xx10x1
RR Spkr Shorted Low
Indeed, the rear right speaker doesn't sound. I swapped the left speaker for the right and it works fine on the other side, so it's not the speaker itself.
I have obtained the electrical diagnosis manual of a 2018 and it seems that it is related to a bad ground connection. I have verified continuity between the - of the speaker and the - of the battery. Also the electrical resistance, which comes out 0.3 ohms.
I haven't had time to check more yet.
Do you think it is possible that both things are related?
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