If you're going to flash the BCM you really should use a power supply or another car. Loosen fusible links 15 & 16 in the Battery Junction Box and in the event it fails, pull them out quickly. Current: Discovery 3 06MY (55 reg) HSE Auto Zambezi Silver Allisport Fast Road Intercooler, V8 Brakes, Silicone IC Hoses, EGRs Blanked, Remapped, De-Cat pipe, FBHIC
Freelander 2 2007 HSE Manual Tambora Flame
Previous: FL2 56 reg SE Manual Black (written off )
Disco 3 06 reg B7S Manual Rimini Red
Disco 2 TD5 Y reg ES Manual Blue - Chipped
Several Discovery 300 TDis
17th Feb 2015 9:15 am
Sly666
Member Since: 14 Dec 2014
Location: East Sussex
Posts: 459
Lol.
Yes i have fat fingers. But find a bic pen lid to be an excellent stylus.
17th Feb 2015 10:05 am
harrythespider
Member Since: 21 Oct 2008
Location: cumbria
Posts: 290
LfL what does pulling them out quickly do?
17th Feb 2015 8:37 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20831
If it fails, it keeps the rear lower tailgate actuators on, and will burn them out.
Member Since: 21 Oct 2008
Location: cumbria
Posts: 290
That's not good. Thanks for the advice both.
17th Feb 2015 9:26 pm
BBS SPY Site Sponsor
Member Since: 15 Jun 2007
Location: Sunny Cyprus
Posts: 3054
Quote:
will burn them out
Quote:
can toast the door locks too
Could I possibly ask you to detail your own personal experiences of this.
I ask this because as very many know, BBS has for very quite a substantial and significant number of years now been producing diagnostic equipment in the form of the MSV-2 and now also the Nanocom Evolution that has been capable of flashing the BCU/CJB, and despite some having flashing failures when flashing the BCU / CJB, not one has ever reported burning their tailgate or door locks out.
20th Feb 2015 6:50 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
Seen it twice on MSV2 and once on SDD. First time on MSV2 we didn't realise what was happening and it got expensive. On the other occasions managed to remove power or fuses. Not had a problem yet on IIDTool when following the precautions and recovery methods Gap lists in their manual.
You need to get out more Colin.
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20831
Had exactly that, with a failed CJB update on an 06 car, using the MSV2
New CJB, new engine ECU and new lock set were required to get the car running again. In addition, both lower tailgate latches wouldn't work afterwards...
...was once regarded as impossible to modify a vehicles settings until I personally introduced the acronym and term CCF, provided the capability to edit it and all the power and capability it now represents...
It still makes me chuckle, even now. Although the 'bad byte or sector in the Flash memory' stuff from BBS took all the humour out of the topic as we entered the twilight zone….
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 21 Oct 2008
Location: cumbria
Posts: 290
I'm even more confused than I was before. I have read numerous posts regarding flashing and the problems encountered, using a myriad of different make tools and I cannot understand how removing fuses 15 and 16 from the battery fuse box (heated front screen and heated door mirror) can affect rear lower tailgate motors, door locks and other equipment covered by other fuses. Likewise removal of headlamp connectors to effect a solution. The overlaying theme to most of the posts appears at all times of flashing, to ensure a continuous and uninterrupted power supply of 25A. So are the instances of 'burnout' down to failure to have said power supply?
Obviously I am rather reluctant to flash anything until I have an adequate power supply.
I understand CTEK have such a charger, Sealey do a BCSU25 which appears to push out 25A, but is less money.
21st Feb 2015 3:38 pm
harrythespider
Member Since: 21 Oct 2008
Location: cumbria
Posts: 290
should be Sealey BSCU25.
21st Feb 2015 3:53 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20831
When the BCM has a failed refresh, it keeps a number of the outputs "active" and they are permanently on. This can be seen visually if it decides to keep the headlight/main beam on.
In the case of the latches, they are fed with a constant feed, and as such burns out the electrical motor inside the latch
By removing the fuses listed, it cuts power to the required parts of the BCM, so even if it does fail, the fuses can be quickly removed, and power cut before any damage is done My D3 Build Thread
Member Since: 21 Oct 2008
Location: cumbria
Posts: 290
So the fuses are unwittingly 'dual purpose' serving both the intended parts plus the BCM. I think I read that a flash could be done with fuse 15 or 16 removed, if that's true, why, as a precaution, the fuse isn't removed prior to reflash, thus avoiding the possibility of a 'burnout'.
On an aside, I have been told that the 'cheap' keyfobs on fleabay can be programmed if the horn is disconnected, is this another oddity of the D3 canbus or likely to be untrue.
Can I just add my input that having flashed hundreds of BCU,s with quite a few diagnostics kits over the years, I have only had one BCU fail on me.
This was long before LR decided to release the TSB about how to recover from a failed flash on a BCU. Had I known about this procedure then, I would have been able to recover from it, it turns out the car ended up at the dealers and they actually got on to LR who informed them about the TSB and they did the TSB to recover the car.
Its not the tool that causes the Issue as LR use there own diagnostic kit and they have had this happen to them as well hence the TSB, its just the luck of the draw, but at least we all are now more aware of the problem.
You could say this about BT modules as I have had quite a few of them fail when being flashed,these are not recoverble, but its not the tool that causes the issue.
I now warn customers about flashing these Ecu's, if it does not need flashing then leave well alone.
There seem's to be some scare mongering about, if you follow the manual and talk to the customer about the risk, and most importantly make sure you have a good power supply on before flashing any Ecu's, there is not a lot more you can do to minimise the risk of a failed flash, you have to except that when your carrying out these procedures you are taking a risk.
All my diagnostic tools now have built in safeguards to try to prevent this from happening so hopefully we don't see this again.
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Allisport Fast Road Intercooler, V8 Brakes, Silicone IC Hoses, EGRs Blanked, Remapped, De-Cat pipe, FBHIC
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That's not good. Thanks for the advice both.
