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Car Forum / BMW Cars / March 2005Brake Light Circuit???
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??? ~J. > I'm getting an intermittent "Brake Light Circuit" message on my 1991 > E32. It appears that the left rear brake light is working [quoted text clipped - 4 lines] > > ~J. Usually the "Brake Light Circuit" message is sent when the brake light switch under the brake pedal goes bad. Its an inexpensive and relatively easy fix for a DIY'r. Kyle. 98 740iL 97 M3 > Usually the "Brake Light Circuit" message is sent when the brake light > switch under the brake pedal goes bad. Its an inexpensive and relatively [quoted text clipped - 3 lines] > 98 740iL > 97 M3 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. ~J. >> Usually the "Brake Light Circuit" message is sent when the brake light >> switch under the brake pedal goes bad. Its an inexpensive and relatively [quoted text clipped - 8 lines] > when one of the bulbs is old or weak. Hence the practice of replacing ALL > the bulbs when one burns out. 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 not always. Kyle. 98 740iL 97 M3 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... > >> Usually the "Brake Light Circuit" message is sent when the brake light > >> switch under the brake pedal goes bad. Its an inexpensive and relatively [quoted text clipped - 11 lines] > 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 > not always. > > Kyle. > 98 740iL > 97 M3 > >> Usually the "Brake Light Circuit" message is sent when the brake light > >> switch under the brake pedal goes bad. Its an inexpensive and relatively [quoted text clipped - 13 lines] > control system. As I said it USUALLY means a bad brake light switch, but > not always. Kyle is correct. The BRAKE LIGHT CIRCUIT ERROR is related to the switch mounted to the brake pedal. The individual brake lamps gives a different message. BRAKE LIGHT CIRCUIT ERROR means that the car thinks it has too much current in the brake light circuit. This comes from a switch that is mounted on the brake pedal. There are two switches mounted on the brake pedal, and I am not sure which one causes the error. If the message is LEFT BRAKE LIGHT OUT (or equivelent) then the left brake light is not working. If the right brake light is not working, then the message will be clear. If the brake light is really working, then the ground for the light(s) on the particular corner may not be connected well. Unplug the light assembly and check the condition of the pins. You would do well to completely remove the lamp housings, 4 screws, and inspect the intergrity of the plastic. The BRAKE LIGHT CIRCUIT ERROR message remains on until the car is switched off, then the message may or may not return when the brake pedal is pressed. My car can give the message, and I can switch the car off then back on again, and the message goes away and does not return for several days, or weeks. I have been struggling with this for going on three years now, and the measage is very intermittant. > I'm getting an intermittent "Brake Light Circuit" message on my 1991 > E32. It appears that the left rear brake light is working [quoted text clipped - 4 lines] > > ~J.
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