Member
I swapped an LS3 into my 2001 525iT. It's currently running and reasonably complete but a couple days ago I realized my brake lights weren't working! I never thought to check since I didn't realize I had messed with anything...
It turns out I had run the brake signal to the GM ECU, which was disturbing the brake pedal signal to the "lighting module". I disconnected it expecting everything to work. But now my brake lights are on all the time!?
Does anyone have a clue where I should look? I've tried manually tinkering with the pedal sensor (ie. shorting, grounding, etc) with no luck. I don't think I have routed the brake signal to/through anything else so I'm a bit confused. Could it be ABS related?
"In theory, there is no difference between theory and practice, but in practice there is."
Member
My brake lights stay on all the time when the plug is disconnected. You might have a broken wire where the splice was made.
Member
Silly mistakes. I had wired the brake light to the ECU signal wire as I mentioned. After fixing that, it still didn't function properly. In the end I started interrogating the brake sensor pins to determine what is missing and it didn't have power. Turns out I blew the fuse somewhere along the way,which was the first thing I checked! Anyway, new fuse and it works fine. I'm really not sure when the fuse blew or if I inadvertently fixed something else, but it works now.
Thanks for chiming in.
"In theory, there is no difference between theory and practice, but in practice there is."
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