I appreciate that this is an old thread, but the issue I have is very similar to this ......
LT 2005 version, 26k miles.
Cruise control work fine out on the road.
From driving off, the self diagnostic runs and all the relevant warning lights extinguish.
Brakes feel great - but - if I use only the front brake, the issue doesn't appear - but if I use the rear brake (either alone or in conjunction with the front brake), the 'general warning' lamp lights up.
The manual states that either there's a bulb blown (not so) or the cruise control is unavailable (but as stated this is not the case).
I followed the cruise control diagnostic check list and it failed at step 8 (rotate rear wheel - light flashes on/off) - the light didn't flash, it remained solid.
Can anybody advise what that means? My bike is still under warranty and it'd be good to advise the dealer of what the issue is likely to be.
Based on you last post where you included the VIDEOs, I am 99% sure the problem is with the rear brake switch (located behind pedal).
The owner manual (for 2002-2009) does mention fact that defective rear-bulb will cause a steady GENERAL WARNING (triangle). HOWEVER, what the owners manual (or the shop manual) does NOT say is the following:
(1) if either brake switch does NOT "click" when pressure is applied to lever or pedal. The IABS modulator can sense that there is fluid pressure, but no switch contact was made prior - switch should be adjusted to go on fairly early in lever/pedal travel.
(logged fault in system is: 17917 defective Rear brake switch)
(2) if either brake switch is disconnected (or a wire cut), the fault will not be the same as it will be seen as a false self-check (after ignition ON). In such case you would see continuous fast ABS warning (4 times per sec)
(3) if rear bulb brake filament (high intensity) is defective, you will see similar error as you saw but it would affect both front lever and brake pedal. If the filament of the rear night lite (low intensity) is burned , the GENERAL WARNING will be on even before you have applied brake
(4) when a steady GENERAL-WARNING happens only on either FRONT or REAR brake application, then you need to investigate if the specific brake switch is working.
AT THIS POINT, BEST TROUBLESHOOTING method is to test continuity of rear brake switch WITH IGNITION OFF. The 1st connector you can reach is located behind fairing on right side - see attached photos. Use OHM function of multi-meter to test unplugged connector using small pins (needle) on female side (toward pedal).
IMPORTANT: On IABS models (2002-2009 for USA) these brake switches have reversed logic: continuity when lever/pedal is at rest ...AND... no continuity when brake is applied.
IF NEEDED, assuming this first test is not conclusive, FURTHER tests can be done directly at the large connector located on the ABS modulator (as the brake switches signal goes thru the IABS unit electronics). These test should be done ONLY with the main battery disconnected.
See 2nd photo ...