Won't start and rear brake lights stay on - MINI Cooper Forum

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post #1 of 7 (permalink) Old May 28th, 2014, 12:37 AM Thread Starter
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DIY Won't start and rear brake lights stay on

I have a 2005 cooper convertible that is driving me nuts with two problems, that i dont know if they're relates or not. Since my closest mini dealer is a 3hr drive, i need a bit of help hčre.

1. Car won't start. Turn key, everything turns on normally (lights and all) but the motor doesn't turn over. The mechanic said the wire going to the starter was oxidated and broke off so i had it rebuilt at a local shop. Put in back in the car and it still won't start.

Looking at the WDS diagram, we have power from the battery to the starter, and power from the ignition switch to electronic control unit, but none from the ECU to the starter.

I also did the ECU software reset procedure, which worked well but still cant start.

2. Ever since the car went to the mechanic the rear brake lights stay on.

Any ideas?
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post #2 of 7 (permalink) Old May 28th, 2014, 03:27 AM
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This might sound stupid but have you tried jump starting it? last time the battery went in my mini all the lights were on as normal but the car refused to start, I was stumped as to the problem but as a last resort I tried a jump start and the car started.

Also you might want to try and get your hand on a code reader and see if that helps with the troubleshooting.
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post #3 of 7 (permalink) Old May 28th, 2014, 10:35 AM Thread Starter
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I replaced the battery last year and never had any problems with it. The car easily start under compression, but that's all.

I also dont understand Why the brake ligots stay on..
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post #4 of 7 (permalink) Old May 30th, 2014, 01:01 AM Thread Starter
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Tried boosting it tonight, still won't start.
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post #5 of 7 (permalink) Old May 30th, 2014, 08:33 AM
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Were the brake lights stuck on before you went to the mechanic and didnt notice? if so it might be a stuck switch on the brake pedal?
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post #6 of 7 (permalink) Old May 30th, 2014, 11:53 PM Thread Starter
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Never noticed the brake light so it might have been like that before. I took the brake pedal sensor off but havent found a diagram to check it Out with a tester...
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post #7 of 7 (permalink) Old Jun 2nd, 2014, 02:23 PM
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I had this a few weeks ago - exactly the same.

Car did eventually start, and I left it running with heater on hot and blower on full blast, thinking it was caused by dampness in the BCU?


Been fine for past fortnight until today, had another odd symptom today with wipers on with engine off and car locked.

I'm told it's symptomatic of BCU breaking down, or something within the BCU not being right. Possibly corrosion in the circuits?

I've put up a post today on this forum hope we'll get some answers.

Impster
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