Electrical issues from battery? (2008 Mini Cooper S Convertible) - MINI Cooper Forum

Second Generation MINI Convertible MINI Convertible (MINI Cabrio) 2009 - Present

 2Likes
  • 1 Post By MiniAlf486
  • 1 Post By gazza82
 
LinkBack Thread Tools Rate Thread
post #1 of 13 (permalink) Old Jan 9th, 2017, 06:55 PM Thread Starter
MINI2 Newbie
 
Join Date: Mar 2015
Local Time: 03:43 AM
Posts: 6
Mentioned: 0 Post(s)
Quoted: 0 Post(s)

 
Question Electrical issues from battery? (2008 Mini Cooper S Convertible)

Hi all. I've got a 2008 Mini Cooper S convertible which has suffered electrical gremlins for a while. It starts fine but during driving will randomly start playing up, potentially related to bumps in the road. This causes:
- Turn signal / indicator warning light in the cabin to stay on even when the stalk and probably outside light is off
- Airbag warning light to come on
- Stereo to lose responsiveness e.g. volume changes not registered until it rights itself many seconds later
- Clock/miles display dims randomly
- Cd player display dims randomly
- Cd player randomly stops and restarts
- Seatbelt warning light comes on when both/one passenger seated with belt fastened
- Seatbelt warning sound dings when seatbelts fastened, then stops randomly
- Yellow brake warning light (exclamation within trial within arrowed circle)
- Yellow 2 person passenger airbag off indicator above rear view mirror
- Indicators staying on as usual BUT also timing out while turned on and waiting for the traffic light to turn green

I've taken it to our local garage, who had it for a total of about 2 weeks & were commuting to & from work with it - with me paying for petrol - so they could diagnose. Ended up changing the central computing unit in the dash (with speedo) and were considering changing the other dash computing element (I forget the name), they may have actually done that. Their diagnostics showed the K-Bus interface was acting normally. Conclusion is that we ostensibly owe the garage ~$1000 for parts and work, but the problems remains. I've told the garage this and they haven't replied, so we're at an impasse. I'm not rushing to give them $1000 to have solved nothing, and they're evidently ok to write off the money and time they've spent and lose us as customers.

But I'm still in the same spot. I discussed this with my uncle, a car guy, who said it sounded like a battery issue: either battery or cables not housed or connected well, or the earth cable was shorting somewhere along its run, causing the battery signal to the computers to flicker intermittently and play havoc with the electronics. He advised checking the leads, ensuring the battery connectors we on firmly, maybe with vaseline, and tracing the run of the earth wire. I checked that the battery leads are connected firmly but haven't yet done vaseline, and can't seem to check the run of the cable because it's in the boot/trunk and the cables almost immediately burrow into custom-made holes and disappear.

Does anyone think that my uncle's explanation sounds reasonable? Can anyone advise of how I can check to fix this issue given that I don't seem to be able to access the battery cables other than the first tiny run before they disappear?

THANK YOU in advance, for any ideas.

Cheers

sharky_pi is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old Jan 9th, 2017, 07:03 PM
MINI2 Master
 
Join Date: Dec 2013
Local Time: 03:43 AM
Posts: 3,630
Mentioned: 15 Post(s)
Quoted: 701 Post(s)

United Kingdom
 
Your uncles theory is on the right track. I'd be checking the BCM (Body Control Module) which is on the right hand side of the car's footwell. These are prone to water damage and could very well be the root cause of your problems.

SeanC is offline  
post #3 of 13 (permalink) Old Jan 9th, 2017, 07:25 PM Thread Starter
MINI2 Newbie
 
Join Date: Mar 2015
Local Time: 03:43 AM
Posts: 6
Mentioned: 0 Post(s)
Quoted: 0 Post(s)

 
I think - but i'm very much not sure - that the BCM was changed, but like I say, little confidence in that thought.
goo.gl/photos/RwWdhj7A63N2jS9P6
Photo album of my footwell, I've been googling around but haven't yet found anything telling me which part is the BCM!
If a visual inspection by nonexpert (me) doesn't definitively confirm the BCM hypothesis, do you reckon it's a cheap enough option to go to another garage & ask them to take the BCM out & test it somehow?

Thanks for the super quick reply!!

Edit: so that was the passenger footwell which is the wrong side. Have remove the top-near and centre-far hex screws holding the black plastic panneling over the BCM in the drivers side footwell, but it seems to need at least 1 maybe 2 more screws removed, possibly bottom-middle and somewhere near the back. Research continues...
sharky_pi is offline  
post #4 of 13 (permalink) Old Jan 9th, 2017, 08:03 PM
MINI2 Regular
 
Join Date: Oct 2015
Location: Darn Sarf
Local Time: 03:43 AM
Posts: 156
Mentioned: 1 Post(s)
Quoted: 27 Post(s)

England Male
 
Garage
Sound words from SeanC. If it has been changed a lot of electrical gremlins can traced back to a bad earth on the battery.

Have look at where the earth cable from the battery is fixed to the car. It may be loose or there's some rust/dirt,/corrosion around the mounting.

Minialf
SeanC likes this.
MiniAlf486 is offline  
post #5 of 13 (permalink) Old Jan 9th, 2017, 08:05 PM Thread Starter
MINI2 Newbie
 
Join Date: Mar 2015
Local Time: 03:43 AM
Posts: 6
Mentioned: 0 Post(s)
Quoted: 0 Post(s)

 
Cheers Alf. Do you know where that would be? Like I say, the connectors from battery to elsewhere near-immediately disappear into the bodywork and I don't know how to follow them...

Trying to work out how to get that BCM panel off also. Could do with investing in a Haynes manual methinks...
sharky_pi is offline  
post #6 of 13 (permalink) Old Jan 9th, 2017, 08:23 PM
MINI2 Master
 
Join Date: Dec 2013
Local Time: 03:43 AM
Posts: 3,630
Mentioned: 15 Post(s)
Quoted: 701 Post(s)

United Kingdom
 
Earth mounts are anchored to the top of the chassis legs so start at the battery terminals - make sure they are as snug as a bug then look at the earth points. Take the bolts out then clean up the chassis and the earth contact where they mate together and make sure they are nice and tight too.

If it is your bcm (which I suspect) then your best place is the main dealer. I've had too many people come to me saying that other garages have tried to fix their bcm' s, I just refer them to the dealers - Horses for courses!

Sent from my SM-J510FN using Tapatalk
SeanC is offline  
post #7 of 13 (permalink) Old Jan 9th, 2017, 08:27 PM Thread Starter
MINI2 Newbie
 
Join Date: Mar 2015
Local Time: 03:43 AM
Posts: 6
Mentioned: 0 Post(s)
Quoted: 0 Post(s)

 
Cheers Sean. I've been thinking about heading to the main dealer to have em programme a few personal profile changes (3 blinks for nudge indicator stalk, lower convertible top via key fob) so this would give me a decent excuse to make that drive. Assuming it's not the battery...
sharky_pi is offline  
post #8 of 13 (permalink) Old Jan 9th, 2017, 08:31 PM
MINI2 Regular
 
Join Date: Oct 2015
Location: Darn Sarf
Local Time: 03:43 AM
Posts: 156
Mentioned: 1 Post(s)
Quoted: 27 Post(s)

England Male
 
Garage
Having run an old Alfa Romeo when younger I can sympathise with the frustration of intermittent electrical issues .
MiniAlf486 is offline  
post #9 of 13 (permalink) Old Jan 9th, 2017, 08:42 PM
MINI2 Master
 
Join Date: Dec 2013
Local Time: 03:43 AM
Posts: 3,630
Mentioned: 15 Post(s)
Quoted: 701 Post(s)

United Kingdom
 
I'm not a fan of main dealers but there are instances when it's the cheapest option in the long run. You could spend weeks or months taking your car to different so called specialist's and still be lumbered with the same fault and be hundreds of pounds out of pocket and still have a broken car!

Sent from my SM-J510FN using Tapatalk
SeanC is offline  
post #10 of 13 (permalink) Old Jan 9th, 2017, 08:52 PM Thread Starter
MINI2 Newbie
 
Join Date: Mar 2015
Local Time: 03:43 AM
Posts: 6
Mentioned: 0 Post(s)
Quoted: 0 Post(s)

 
Ha, well that's where I am right now, only in the somewhat odd position of apparently owing someone $1000 that they don't want to collect!

sharky_pi is offline  
post #11 of 13 (permalink) Old Jan 9th, 2017, 08:55 PM
MINI2 Master
 
Join Date: Dec 2013
Local Time: 03:43 AM
Posts: 3,630
Mentioned: 15 Post(s)
Quoted: 701 Post(s)

United Kingdom
 
Well keep the money and use it to have the car repaired properly

Sent from my SM-J510FN using Tapatalk
SeanC is offline  
post #12 of 13 (permalink) Old Jan 14th, 2017, 01:29 PM
MINI2 Newbie
 
Join Date: Jan 2017
Local Time: 03:43 AM
Posts: 3
Mentioned: 0 Post(s)
Quoted: 0 Post(s)

 
Quote:
Originally Posted by MiniAlf486 View Post
Having run an old Alfa Romeo when younger I can sympathise with the frustration of intermittent electrical issues .
Like the radio resetting when you turned on fog lights? My 75 did that ... which meant watching/hearing aerial go up and down several times :-)
MiniAlf486 likes this.
gazza82 is offline  
post #13 of 13 (permalink) Old Jan 14th, 2017, 01:30 PM
MINI2 Newbie
 
Join Date: Jan 2017
Local Time: 03:43 AM
Posts: 3
Mentioned: 0 Post(s)
Quoted: 0 Post(s)

 
Quote:
Originally Posted by MiniAlf486 View Post
Having run an old Alfa Romeo when younger I can sympathise with the frustration of intermittent electrical issues .
My 75 used to reset the radio i you turned on the fog lights!
gazza82 is offline  
Sponsored Links
Advertisement
 
Reply
Tags: , ,


Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the MINI Cooper Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Rate This Thread
Rate This Thread:



Similar Threads
Thread Thread Starter Forum Replies Last Post
Mini Cooper Convertible And A Pram... melliejc MINIs, Children & Parents 6 Dec 18th, 2015 08:35 AM
Problems with Mini Cooper since new battery installed incorrectly mini-leigh Maintenance & MINI Care 3 Aug 8th, 2015 05:40 PM
Mini Cooper Convertible CferCat Welcome New Members 2 Jun 6th, 2015 04:34 AM
2007 convertible Mini Cooper S Ime rio Welcome New Members 0 May 17th, 2015 11:18 AM
My mini cooper battery light stays on poscablue First Generation MINI Cooper 1 May 2nd, 2014 01:44 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome