Apologies for this long post, but I'm hoping we have some tech people who can help or point me in the right direction.
My 2008 R1200GS has just developed a problem with her heated grips (great timing as we are currently experiencing morning temperatures around -10c).
To keep a long story short, I'm convinced it's NOT the actual elements in the grips as the have both failed at exactly the same time, and before they packed up completely, they were both working intermittently at the same time.
I'm using the wiring diagram from https://www.r1200gs.info/R1200GS-WD2.pdf
to try and work through the possible causes.
I've just striped the right hand switch assembly and have confirmed the heater switch is working correctly. which leaves me to consider the following other possibilities...
1) There is a fault in the ZFE Control module
2) There is a fault in the 'BMS K Control Module'
3) There is a break in one of the wires from the handlebar switch to the ZFE or the 'BMS K Control Module'
4) There is a fault with one of the several sensors used by the ZFE (or the BMS K Module) to determine whether the grips should be powered or not (I understand there is logic to prevent the grips being powered below a certain RPM or low battery voltage etc)
Before I go to the trouble of removing the tank to gain access to the relevant modules and wiring, I want to get as much information as I can.
Therefore, does anyone have any information or links to details about the 'BMS K Control Module' or the ZFE Module?
Specificaly I'm trying to work out what to expect on the wire that goes from the BMS K Module to the handlebar switch, does this wire go 'live' (+12v) when the grips are 'enabled' (thus supplying voltage signals to the ZFE via the handlebar switch. Or, does the wire go to ground (0v), therefore grounding the ZFE inputs via the handlebar switch, or indeed is there some fancy digital signal sent?
I'm pretty sure the functionality of these modules will be a closely protected secret only available to authorized technicians, but I live in hope
Thanks for taking the time to read.