2016 Fatboy S front hcu problem leading to empty battery
Thread Starter
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Intermediate
Joined: Jul 2016
Posts: 39
Likes: 16
From: Germany
2016 Fatboy S front hcu problem leading to empty battery
Hi all,
I have a 2016 Fatboy S.
When not riding I can hear a ticker from time to time coming from the front hcu.
I can feel a short vibration on the front hcu when this is happening.
This leads to an empty battery. Sometimes it takes 3 days, sometimes I can leave her for a week and all is good.
Every time the front hcu is doing this the voltage drops from saying 12.7 to 12.4 volts.
The more it happens the more the battery is drained.
Usually I have a trickle charger on the bike.
But I will do some travel with it and make sure it won´t drain my battery on the trips I am planing.
There is no dtc stored.
I also have a 2016 Slim S that is not having this problem at all.
Any idears from you guys?
I have a 2016 Fatboy S.
When not riding I can hear a ticker from time to time coming from the front hcu.
I can feel a short vibration on the front hcu when this is happening.
This leads to an empty battery. Sometimes it takes 3 days, sometimes I can leave her for a week and all is good.
Every time the front hcu is doing this the voltage drops from saying 12.7 to 12.4 volts.
The more it happens the more the battery is drained.
Usually I have a trickle charger on the bike.
But I will do some travel with it and make sure it won´t drain my battery on the trips I am planing.
There is no dtc stored.
I also have a 2016 Slim S that is not having this problem at all.
Any idears from you guys?
Grand HDF Member
Joined: Nov 2012
Posts: 4,997
Likes: 2,083
From: Newport,TN area
Good question.....
https://www.abbreviations.com/HCU
Closest I see is 'hydraulic control unit', which to me sounds like ABS, but who knows....
T.
https://www.abbreviations.com/HCU
Closest I see is 'hydraulic control unit', which to me sounds like ABS, but who knows....
T.
Seasoned HDF Member
Joined: Oct 2019
Posts: 10,819
Likes: 7,455
From: OH
Good question.....
https://www.abbreviations.com/HCU
Closest I see is 'hydraulic control unit', which to me sounds like ABS, but who knows....
T.
https://www.abbreviations.com/HCU
Closest I see is 'hydraulic control unit', which to me sounds like ABS, but who knows....
T.
Thread Starter
|
Intermediate
Joined: Jul 2016
Posts: 39
Likes: 16
From: Germany
HCU is the ABS-Module. At least they call it that in the service manual.
And yes, it is a hydraulic control unit.
Sorry if I named it wrong.
And yes, it is a hydraulic control unit.
Sorry if I named it wrong.
Last edited by sepperl; Jun 5, 2024 at 07:08 AM. Reason: text addition
Seasoned HDF Member
Joined: Oct 2019
Posts: 10,819
Likes: 7,455
From: OH
You didn`t , I was ignorant of the term, my bad
I can`t imagine power should sent there when bike is OFF
I guess you`ll need to trace the current wire backwards
I can`t imagine power should sent there when bike is OFF
I guess you`ll need to trace the current wire backwards
Thread Starter
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Intermediate
Joined: Jul 2016
Posts: 39
Likes: 16
From: Germany
This is realy PIA because there are no dtc stored.
Next problem is that it is doing it not allways.
So it could be a wire that sometimes has connection and sometimes not.
But if there is sometimes something wrong with the abs it should immediately trow a dtc and red light.
In this case I really do not knwo where to start.
I agree that power should not be present when bike is off.
The abs-module has nothing to do with security mode or any thing else that has power when bike is off.
Next problem is that it is doing it not allways.
So it could be a wire that sometimes has connection and sometimes not.
But if there is sometimes something wrong with the abs it should immediately trow a dtc and red light.
In this case I really do not knwo where to start.
I agree that power should not be present when bike is off.
The abs-module has nothing to do with security mode or any thing else that has power when bike is off.
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Seasoned HDF Member
Joined: Oct 2019
Posts: 10,819
Likes: 7,455
From: OH
No help but I guess you`ll have to resort to the "wire wiggle " test
Difficult on a late model with complex electrics
Good luck
I believe the wiring diagram is available on Harley Service portal using your VIN
Difficult on a late model with complex electrics
Good luck
I believe the wiring diagram is available on Harley Service portal using your VIN
Last edited by eighteight; Jun 5, 2024 at 09:23 AM.
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HDF Community Team
Joined: Nov 2012
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From: USA
I'd strongly suggest getting hold of the wiring diagrams, because you're really going to need them.
Sounds a bit like two problems at the same time. They may or may not be related to each other.
One is power to the HCU. Far as I know, that should be completely cut off from power when the bike it turned off.
Second is actuation. Be that somehow perceiving a signal, or going through start-up testing or whatever.
I would follow the power first myself.
Sounds a bit like two problems at the same time. They may or may not be related to each other.
One is power to the HCU. Far as I know, that should be completely cut off from power when the bike it turned off.
Second is actuation. Be that somehow perceiving a signal, or going through start-up testing or whatever.
I would follow the power first myself.
Thread Starter
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Intermediate
Joined: Jul 2016
Posts: 39
Likes: 16
From: Germany
Seems this will be a long run.
I have all the diagrams.
Yes power to HCU should be compeltely of when bike is switched off.
I am also thinking that somehow the HCU gets a signal for actuation.
I am watching power drain when bike is off. It all looks good until HCU starts its dance.
Will go deeper in it the next days.
I just was wishing that someone had this problem and has solved it.
I have all the diagrams.
Yes power to HCU should be compeltely of when bike is switched off.
I am also thinking that somehow the HCU gets a signal for actuation.
I am watching power drain when bike is off. It all looks good until HCU starts its dance.
Will go deeper in it the next days.
I just was wishing that someone had this problem and has solved it.