Just when you thought she was all fixed

[ianst0028]

My darling x5 has decided that after not needing anything doing to her for the last 8 weeks she'd spent enough time lulling me into a false sense of security
Tonight we all jump in and head to the supermarket as I pull her into a parking space the check engine light comes on
I've got my code reader in the back because I needed it on another job this afternoon so I plug in to see what's up
Nothing.... As in the code reader doesn't even light up
Then this high pitched siren kicks off
After about 10 min the siren shuts up and I start the car (I could start it while the siren was sounding btw)
I then notice that the car seems to be in transport mode.... No wipers no central locking
I've just plugged the bmw laptop in but it can't see the engine gearbox or body control ecu's

I can't be bothered to go hunting tonight but tomorrow I'm assuming that I'm gonna be spending hours looking for a blown fuse (God please let it be that simple)
Any way I've got the car at home now and the battery is disconnected for the night

Any one got ideas..... I'd love to hear them (yes I've contemplated a gallon of petrol and a match)

[graemeX5]

Hi Ian

I don't know enough but found these links which may help

Possible X5Sport or another would know more than me

Hope that helps

Links are
http://xdrivers.co.uk/forum/index.php/t ... 881.0.html

http://xdrivers.co.uk/forum/index.php/t ... 895.0.html

http://xdrivers.co.uk/forum/index.php/t ... #msg123312

[ianst0028]

Thanks Graham
Lol one of those is my thread from when it went into transport mode last time.... This time it's a bit worse I think because the engine ecu was showing on the laptop last time
I'm gonna start with fuses and progress to raging fire tomorrow

[Steamyrotter]

My first stop would be to disconnect the battery (Which you have already done now i have re-read the original post!!) and discharge the car (Short the leads together)

Then start again....


Sounds like you may have had a low voltage issue somewhere possibly, of could have some moisture in places it shouldn't be..

[henrym3]

[quote="henrym3"]

Pin Signal Description
1 +12V Ignition(in run or start)
4 CGND Chassis ground
5 SGND Signal ground

7 ISO 9141-2 K-LINE engine (ISO-9141 and ISO-14230), automatic transmission diagnostic (in some models)
8 ISO 9141-2 K-LINE IKE/KOMBI, ABS, ABS/ASR, ABS/ABD, ESP, DSC, Airbag and other electronic equipment
9 TD/RPM Engine rotation speed
15 ISO 9141-2 L-LINE L-Line of ISO 9141-2 and ISO 14230-4
16 +12v Battery power
[/quote]

Pin 1 is top left as you look at the socket

[ianst0028]

Ok I'm weak..... The frustration was driving me insane. So I've gone back out to the car with my light and some long nose pliers
Fuse 14 the little b@$|®€ was blown..... It's part of the diagnostic circuit
I've left the battery off for the night and I'll hook it all back up in the morning with everything crossed

Thanks for the help guys..... I'll let you know what the results are tomorrow

[henrym3]

I bet myself a chocolate chip cookie you wouldn't be able to wait till morning. Tastes lovely. Well done for finding the fault, you'll sleep easier

[ianst0028]

You owe someone a cookie lololololololololol
I left it till this morning hooked the battery up put the key in to silence the siren and hey presto all fixed
Still no idea what the initial fault was though lol

[Reusch]

Great news

[X5Sport]

Sometimes it can be no more than thermal fatigue (heating & cooling cycles) causing the fuse link to crack through.

[Steamyrotter]

[quote="ianst0028"]
Still no idea what the initial fault was though lol
[/quote]

Its an X5...
Does it need a reason??

[X5Sport]

[ianst0028]

nope i guess she doesnt need any reason other than ...... welllllllll it has been over 14 days since your heart stopped and your bank manager cried