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Several are having problems with TPMS on newer models, me included. I'm seeking out a little clarification on the BCM as I have some vague understanding of how it works.
When the TPMS problem arises, it throws codes in the BCM which cannot be cleared by the end user. Only the HD service tech can clear the code of C0077c. By cycling though the TPMS manually by deflating and inflating the tire, the code will change to C0077h allowing the end user to clear the code in the BCM.
So the first question is, why won't the code clear?
When this problem shows up, and throws the code in the BCM, it also sends a signal, I guess, to the Denali SMARTcan I have installed. I guess it's disabling the SMART part whereas the lights still work but it loses all of the settings (intensity, modulation, etc.).
The second question is, would there be any chance, however remote, that the Denali product is causing problems? Messing with the BCM? That sounds unlikely I know as too many folks are having the TPMS problem.
I'm curious as to whether anyone really knows how the BCM works outside of it controls some relays, electrical signals, etc.
Your code is for low tire pressure, I believe the C and H would be for current and historic. I'll attach a couple pictures of TPMS information from the EDM.
I have a Denali Cansmart on my bike, and you can control the lights from the trip button. Three quick pushes of the button will shut my Aux lights One off, this happens pretty easy if you're running down the road and want to check tire pressure.
Back to the tire pressure.... It's my guess the Tech is using the Digi Tech and Activation tool to "update" the reading while the bike is stationary. Otherwise in Drive mode the TPMS needs to see 12seconds of tire rotation. If you check your tire pressure and need to add air, use a gauge to check pressure, the TPMS won't update until certain parameters are met.
Anything I type after this should be fact checked,
Can Bus is how the bikes modules talk to one another. LHCM, RHCM, ABS, BCM, ECM, Radio..... and IM, probably missed a few
Turn your headlight from low beam to high beam and the left-hand control module sends a serial data message out on the twisted pair of Can Bus wires that go to all the modules. The signal has identifiers in it so modules that need to act know it is meant for them, the others ignore the message. In this case the BCM would power up the high beam and the IM would turn on the high beam indicator.
I believe Codes should clear, but if they are current, they will come right back when you start the bike.
Thanks Vernal, I knew you had the Denali installed,
from what I understand there's no possibility of the SMARTcan causing problems, but it seems coincidental. Right now I have it disconnected and have thought about going to just using the lights through their controller to dismiss any possibility of interference. But I don't want to, as, I've already paid for one product that also allows for modulation and programming of different intensities as to having a lesser product that costs more money.
I'll run it like it is for another 500 or so miles, sorta hoping the TPMS problems comes back in order to rule out the Denali controller being the problem.
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A little info on BCM's if you will
