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[EdgarZero]

Curt, I have tried to connect to the bike with the app, but that hasn't been possible since there is no power at all when I turn the ignition on. Do you think I should be able to connect using Bluetooth in this condition?

Thanks, man.

[BrianTRice@gmail.com]

The Bluetooth interface is driven by the MBB, but only when the contactor is closed (mainly driving, but also in charging mode).

The MBB always has some kind of power, so the OBD-II interface is the most assured way to get in there, but even then it may not respond unless it decides it's keyed on.

Well, I will give another try to check pin 1 voltage in the DC DC converter. I have tried connecting the multimeter's negative in the bike's frame and the positive in pin 1 and so far only a small measure (something like 0.1 volts). I will try connecting the negative to the B- input as Brian said. Or do I have to connect the negative terminal in another specific way in order to check pin 1?

I think the input in pin 1 has to be 12 volts when off and high (the voltage from the battery) when on. If there is no voltage at all, the problem could be the MBB, right? Could a failure in the MBB be the responsible for not having power at all?

I also checked the continuity of high voltage fuse 1 (low power b+) and it's fine but I just can't find the other high voltage fuses. I would be very interested in checking the MBB fuse but it isn't where the manual says! Does anyone have an idea of where it is?

I forgot to answer your question above. The MBB is responsible for signaling to the DC-DC converter to turn on, so it could be the cause, yes. However, it has been noted that a bent pin on the relevant line between the MBB and the DC-DC converter can have the same effect, so that's something to check just in case. Use Burton's S/DS schematic to be sure, if you need to look into that, but basically any bent pin would be suspect.

FYI, the one virtue of troubleshooting the DC-DC converter is that it is a generic component that can be bought off the shelf from EV vendors and swapped.

I wish I knew where your fuses were. Because your battery is upgraded, it may just be best to hand it to your dealer at this point.

[Curt]

Earlier you said:

In the last couple of months the motorcycle had two strange behaviors: first it turned on (lights and instrument panel) with no reason when it was parked and I had the key in my pocket).

Was it identical behavior to when you force enabled the DC-DC?

Since the problem developed slowly and got worse, there may be an intermittent short in a connector from bent pin, or in a wire in a pinched wiring harness, that shorts pin 1 to power and/or ground.

The MBB might actually have gone bad so as to sporadically enable or fail to enable the DC-DC, but that seems weird and unlikely.

I forgot you won't be able to access BlueTooth -- unless by some miracle it works when you force enable the DC-DC and the MBB is OK. Speaking of which, if you force enable the DC-DC and key on, does everything else function normally?

[iSurgeon]

I had a similar issue with my 15' fx. One day I turned on the bike and I had no lights or 12v output but the bike ran fine. Next day I found a blown fuse for the dc/dc, replaced it and then no life at all from the bike.  I went through all kinds of testing and troubleshooting, thought it was the mbd like you. Ordered one, installed it and no change. Long story short the dc/dc had failed and ended up blowing the 10a surface mount fuse on the bms board of both of my packs.

[EdgarZero]

Thank you very much Brian and Court for your posts. When the key on and the DC-DC converter forced to work the behavior is the same as the one with the key off: only 12 volts activity (front light, stop light and backlight of the dash working).
The answer to the other question is yes, this was the behavior the motorcycle had before it died and that happened after ridding in the rain. So I think the problem could be a short in the MBB enable pin to the DC-DC converter (caused by water and debris) that kept the DC-DC always on and overcharged the MBB to a no return point.

At this moment I have decided that it might be pointless to try to connect to the MBB if it is broken. I have ordered a new one via Hollywood Electrics. I will replace it and just hope for the best. I will let you know the end of the story.

Thanks a lot for your time

[EdgarZero]

iSurgeon in my case the BMS seems to be ok since the BMS flash code pattern is normal (fourth led flashing every 2 seconds, green). Did this also happened to you?

[iSurgeon]

It was last year so I'm not totally sure but I think the 4th led was flashing green every two seconds like yours. I was also able to connect to the bms with a serial cable to look at the logs and the bms seemed to think it was fine but the fuse was blown.

[EdgarZero]

Ok, so I'll see what happens when replacing the MBB. Maybe you could help me through if the problem results to be the BMS fuses. Thanks, man 

[EdgarZero]

SOLVED!!!! Today my new MBB arrived and it worked like a charm! Now I have to put dielectric grease to the connection to the DC-DC, cover it and re assemble everything. I can't wait to get it on the streets again. YOU CAN'T KNOW HOW GRATEFUL I'M WITH ALL OF YOU FOR YOUR TIME AND ADVICES.

I would like very much to contribute with the unofficial manual, if it is possible, maybe in some kind of content about MBB failures or loss of total power. See you all and long live to electric motorcycles!!!

[Curt]

That is awesome! You sure did a great job figuring it all out!

[BrianTRice@gmail.com]

When the key on and the DC-DC converter forced to work the behavior is the same as the one with the key off: only 12 volts activity (front light, stop light and backlight of the dash working).
The answer to the other question is yes, this was the behavior the motorcycle had before it died and that happened after ridding in the rain. So I think the problem could be a short in the MBB enable pin to the DC-DC converter (caused by water and debris) that kept the DC-DC always on and overcharged the MBB to a no return point.

At this moment I have decided that it might be pointless to try to connect to the MBB if it is broken.

This troubleshooting logic will make it into the manual soon. I am working out how to do this, since it's been critical for a while and the path a reader needs to get to this conclusion correctly needs a little work to make clear.

[EdgarZero]

Hi BrianTRice

Ok, I'm working on a clear writing on this experience and troubleshooting. I will send it to your e-mail as soon as possible. Thanks.

[BrianTRice@gmail.com]

Thanks so much! I'm working on that soon.