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Old 04-21-2013, 09:41 PM   #1 (permalink)
Join Date: Apr 2013
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Tornado_735 is on a distinguished road
Weird tail/brake lamp issue

Hey everybody,

I've come to a dead end in the search for my brake lamp issue, and have resorted to starting a thread about it.

My brake lights function normally...with my headlights OFF.
When I have my headlights ON, my brake lights come on and stay on. I have taken the brake light switch completely out of the circuit while troubleshooting, and still have the exact same problem.

A peculiar twist to this issue is that, with headlights off, if I step on the brakes, my brake lights come on, and so do my instrument cluster illumination lights.

I am at a complete loss as to where to look next.

Anybody have any suggestions?
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Old 04-22-2013, 05:42 AM   #2 (permalink)
Join Date: Apr 2013
Location: Miami Lakes
Car: Silver 2007 bmw 328xi
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wing2007 is on a distinguished road
My friend sounds to me like a bad short circuit where exactly I dont know how ever I would try and take it to someone who's a bmw expert other wise ur doomed to failure
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Old 04-23-2013, 05:35 PM   #3 (permalink)
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Location: Texas
Car: 1994 318i
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big joker is on a distinguished road
I had a similar issue with my 318i. It turned out to be a bad headlight switch, believe it or not. even the brake lights are controlled through the headlight switch.
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Old 04-25-2013, 10:11 AM   #4 (permalink)
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Well, I found my issue. After more research, I learned of the Check Control Module.

I pulled out the module, and sure enough, one of the little heat sink looking connections had gotten hot and actually started sagging into one of the posts coming out of where the connectors hook into the circuit board. I tried to bend it back, but it just broke off (go figure). I hooked it back up to see what it controlled, and everything was back to normal I have a persistent tail lamp failure on the display, but that's fine with me. I have a feeling what happened was that the PO stuck bulbs in the tail lamps with wattage that was way too high, and that's what caued the bridge in the CCM to get hot.

Either way, that problem is fixed. Now I have a parasitic draw that's killing my battery overnight LOL
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