I'm getting an intermittent "Brake Light Circuit" message on my 1991
E32. It appears that the left rear brake light is working
intermittently. However, the "Brake Light Circuit" message is reporting
a problem with the right side. It looks like there is a short some
place, the light will work fine for a while and then go out. Any idea
what the problem could be? Mustard rely, LKM, brake light switch???
Sorry, but I beg to differ. My understanding is that this message is
entirely and only due to failure of the bulb. I CAN, however, be triggered
when one of the bulbs is old or weak. Hence the practice of replacing ALL
the bulbs when one burns out.
I switched the left and right brake light bulbs to see if it was a bad
bulb. The left brake light still went out intermittently.
BTW, if it was the brake light switch, wouldn't both brake lights go
out? It my case only the left side is failing.
The message "Check Brake Lights" indicates a bulb failure. "Brake Light
Circuit" is a wholesale failure of the circuit, at least to the check
control system. As I said it USUALLY means a bad brake light switch, but
I've had the same recurring problem on an e34.
only solution that endures for me: at some point the wrong bulbs were
used -- too hot, and the plastic edges of the brake light assembly
melted and became misformed. the contacts b/w the bulb and the
assembly were less than perfectly aligned...
thus, if one files down the assembly, so the bulb will fit tightly
again, all should be ok...
Kyle and Lori Greene wrote:
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