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Discussion Starter #1
My partners Dooper won't start after an interior light drained the battery overnight. She tried jump starting it unsuccessfully (which might be the cause of the problem) and then charged the battery which seems fine. Engine cranks but won't fire and has the automatic stability control or traction control warning light on. It spins over fine, she called the RAC who proved to be totally useless as he couldn't connect his scanner but a friend later managed to connect his but didn't show anything, probably not the right one. Can anyone point me in the right direction please?
 

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It could literally be anything from a sensor to the immobiliser and you will need to connect a proper code reader to the car. I'm surprised that the RAC's scanner didn't connect! Try cleaning the Crank position sensor's plug and also look around the engine bay for any loose plugs/ wires. Also try another key in the car. The internal lights usually go off by themselves after a few minutes.
 

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Discussion Starter #3
Thanks for the reply. We've tried both keys, same results with both. It was the boot being left slightly ajar and I think they stay illuminated. I'm trying to get hold of a scanner from a few people, but just thought there might be a common fault caused by attempting the jump start which is what the RAC guy told my missus. My worst fear is that it could somehow damage the ECU, the immobiliser was my first thought.
 

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The RAC guy is correct. Jump starting modern cars is really a big no as the surge can spike the ecu and basically fry it in the worst case. On here we tend to advise a trickle charge on the battery to nurse it back to health. Also don't rule out the battery being buggered. Just because it still spins the engine over doesn't mean its working properly. These cars batteries need a decent CCA to fire them up so at best you could have a weak or dead cell/s in the battery....
 

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Discussion Starter #5
Yes, good advice. I'm very knowledgeable about all types of batteries and am sure it's fine but I guess without a scanner I'm fumbling in the dark so am now on a mission to get the codes off it. Thanks very much for your help.
 

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I don't know what the codes are but my concern now is the bcm and/or ecu could be corrupted. This may have to be a main dealer job buddy
 

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the sudden electronic jolt from Jump start could of buggered the bcm.

it's best to trickle charge a battery on modern cars especially MINIS!!!
 

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Discussion Starter #9
Yes, obviously the missus wasn't aware at the time and now I'm where I am. The codes just state different modules can't connect to the ecu along with 3 different scanners so I'm thinking the ecu. Not sure what the bcm is?

Obviously I want to steer clear of the main dealers so does anyone have recommendations for reliable ecu repairs/replacements?
 

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In most cases your actually cheaper going to the main dealers as you could pay an autospark a few hundred quid for nothing and end up taking it to the dealers to have it fixed properly. The ecu and bcu need coded to your car if this is what's failed and the best place for it is the dealers so it's probably best to just suck it up and take the hit!

Sent from my SM-J510FN using Tapatalk
 

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Discussion Starter #11
I've got a friend who is an auto-electrician with plenty of experience who I can call on if needs be so I'm hoping to still avoid the dealers. I found a post on here about replacing the ecu along with key, barrel and body control unit etc so once I can diagnose it is actually the ecu I'll probably be calling on him for his services.

I appreciate the advice, I've just been using Mercedes forums for my own cars and have learnt to avoid the Stealers if at all possible. Who knew owning a Mini could be so frustrating lol.
 

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Discussion Starter #13
I've had my mate over with his SnapOn scanner and it was showing fault codes for the abs, air-con, tyre pressure, stability program but none in the immobiliser and his best guess is an ecu fault so that is now out ready to be sent off. Does anyone have any recommendations? I'm going to seek the advice of a few others too.
 

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Discussion Starter #14
Well I'm back to give the answer to the problem.

I took some advice from my auto electrician friend and disconnected the battery overnight and this seemed to restore certain dash functions but it still wouldn't start. I spoke to another specialist auto electrics garage who wanted the vehicle recovered to them for diagnosis but I was convinced it was something simple and didn't fancy getting fleeced for what could potentially be an 'easy fix'. I started hunting through all the fuses, looked for some under the engine fuse box as well as behind the battery as someone suggested they were there. In the end I noticed what looked initially like a sensor but was actually a small box of 4 fuses and a relay. The bottom fuse was taken out and hey presto it was blown. I replaced it, locked/unlocked car just hedging my bets and she started first time. A subsequent scan showed no faults and she now runs perfectly again.

I attach a photo in the hope it might help somebody else in the future. I'm so glad I stuck to my guns and eventually found the cause rather than just go to the main dealers for the sake of a 25amp fuse. Using forums like this one has served me well over the years and at last I'm able to give something back. Many thanks to those who tried to help.
 

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SeanC
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