I don't know why, but that brake light stuff is getting to me. Last time the Yellow Triangle
came on it was the brake light. The bulbs had some number that aren't carried in the normal car parts places. I substituted it for a close single-filament (that's what both the tail-light and brake share), but then folded and got a new BMW lamp. All was well.
Then yesterday while out in the hills, the Yellow Triangle
comes on again. Stepped off the bike and hit the rear brake. Nadda. No lights, and I just changed the bulbs out 2 months ago.
Stopped by the dealer and buy two more bulbs as I cannot remember if I changed both of the taillight/brake-light bulbs. Bulbs coming out looked fine, not dark and filament appears to be intact.
Installed the new ones. Turned on the ignition and the Yellow Triangle
comes on again. Crap! Walk around the side and hit the foot-brake while examining the rear lamp. They, both taillight and brake light are now working. Glancing at the dash, the Yellow Triangle
is gone. Guess it takes a while for the computer to shut the Yellow Triangle
off. Problem solved.
When I got home, I took the ohmmeter to the two old lamps that appear good. They check out fine. Puzzling?
The only thing I can think of is that the sockets the bulbs fit into are sort of loose, okay, really loose. If the bulb looses contact, I would guess the computer throws a fault and you get a Yellow Triangle as though the bulb blew out. I may go out and pry that little spring at the bottom of the sockets up and see if the bulb(s) won't rattle around as much. Contact cleaner? Maybe the filament is broken someplace (intermittent) and wiggling it cause it to break the connection? Dunno.
Haven't plugged the GS-911 in yet to see if it stored a fault. I'm not crazy about the BMW computer shutting off both lights if one fails, you loose the whole tail-light/brake-light stuff. Shuts off the Patrol LED brake light too (maybe a suspect?), but it acted up before the Patrol LED light was added.
Little history. Original lamps in the 2006 came from Hungary and were really nicely made. Very clear glass and bright silver base. Filament support was outstanding. The auto parts stores in the U.S. are usually brass base and don't look as nice, often crooked in the base. The newest BMW bulbs came on a long cardboard tape in small attached boxes. All say Made in China
(#1059) and look better than the U.S lamps (Sylvania), but no where near as nicely made as the Hungarian ones. Those Hungarian things looked like Waterford Crystal!