Someone just had the same issue, took the switch pak apart and cleaned the switch with some electrical spray cleaner and put it back together.

\Moisture/corrosion/crud can get in there and cause issues.

Worked for him. I would go this route. Additionally check the switch with the connection unplugged with a VOM and test for continuity by actuating the switch.

 

Sounds like it's worth a try, thanks.

 

Here is the thread:

https://www.hdforums.com/forum/milwa...witch-bcm.html

 

Price is high, (I’d opt for getting the lighted switch paks)..but see if he’s willing to take less

https://www.hdforums.com/forum/touri...1500501-a.html


https://www.harley-davidson.com/us/e...es/p/71500248C

 

Just curious, when you turn the ignition to "off", does your rear flashers flash when the bike's security "arms"? (all 4 blinkers should flash a couple times)
Also, does the module from CD that you bought turn the rear blinkers into run/brake/turn lights? (instead of brake light being the only brake light)

Reason I ask, short version,
Codes: five years ago I put HD's ElectraGlo Keystone lights on my RGU, so I'd have turn signal lights when I had the tour pack off. When the tour pack was off, I'd get those two codes. Thought all lights were working normally/correctly, but I figured out the HD Keystone's on the back weren't "flashing" (like the front blinker) to confirm the security module armed after turning bike off. Bike thought the bulbs were bad, kicked the codes. Turned out it was just how the LED controller "worked the lights" (longer story), a design flaw, not correctable. Ironically, I put CD's FillerZ lights on, and the "issue" was gone, but it wasnt much of an issue really.

Blinkers as RUN/Brake/Turn: IF your bikes rear blinker were originally just Run/Turn, and the module changes them to Run/Brake/Turn, it MAY have something to do with a BCM setting for "Dedicated Brake Light". CD will know, probably off the top of their heads, IF this setting matters to the module you're using (it matters, for instance, on the new HD sequential light bar for the tour packs). There is also a BCM setting for front and rear blinkers either LED or Incandescent, but I THINK its "auto sensing", but I am not for sure about that. But LED will kick that code also at first or because the BCM isn't seeing the proper load if they are looking for incandescent, because the LED's draw is so little.

The weird thing, is it sounds like with the LED & module it originally worked, then it didn't... then there's the whole front brake not working while the rear brake is thing, unless there's two issues... So I'm just curious about the two questions I asked.

 

Yes to both.

Well I had a busy morning. Did some diagnosing and it appears there is some moisture in one of the connectors on the Tribar. Blew it out several times with compressed air, let it sit for a couple hours. For the most part things are working well, except one of the LEDs still flickers. It may be faulty, I'll keep an eye on it. Oh, CD asked me to do a different sync procedure: start the bike, put the flashers on, run it for a couple minutes while keeping it about 2,000 rpm. They said this sometimes works better.

Next, I opened my right controls to get the part no from my switchpack. There's a lot of revisions, I wanted to know what I had. While I was in there I started picking, and I disassembled to the point of having the actual switch as shown here:


I wasn't ready to peel off the membrane and go any farther. I actuated it a few times and put everything back together. Guess what? It works now. I have no explanation why, nor do I know how long it will last. But I feel like I'm moving in the right direction!

Thanks all for the help!

 

A bit of an old thread but this just saved me. Brake lights weren't working on my 22 Fat Boy. Was throwing diag code B2151 was going crazy trying to figure it out, read this thread and remembered I had the brake lever off recently. Checked it out and sure enough the Front brake switch was misaligned and not being pressed with the lever. Diag Code is a bit deceiving as it throws the part number for the BCM module, which I feared I would have to get replaced. Thanks for this thread problem solved and no trip to the dealer needed !!!

 

Hey that's great news! OP here, mine is still working like a champ.

 

Actually, when riding in a pack this can be nice as you can feather your break a bit without freaking out anyone right behind you.

 

On the flip side: When you got Karen behind you in her brand new SUV with her head buried in her phone, I'd want all my lights working so that maybe you can get her attention before she plows in the back of you. Pros and cons to everything I suppose.