Hi to all.
I have put this posting on as like many other 5 Series owners having problems you turn to the internet for help ,Google is ok Forums are good but its a mine field and scary.
If this posting helps at least 1 owner find the fault on his/her car it will have been worth it.
My problems started in Nov last year (2012) just after MOT (dont think that is relevent though) i take my car to a local independent dealer who is very good uesd them for years.
After all work is completed the car is sent for a steam off (dont think that is relevent ),problems started one night after a late night home from work, I pressed stop button and removed the keys (it was wet this night) went to the back of the car and removed my bag.
When i pressed the lock button a low alarm started ,i pressed the unlock button NOTHING got spare key NOTHING the alarm was sounding stopping on about 20 sec then stop, after a while would go again then it stopped compleatly (thank God).
I tryed everything that night i open the car with the key in the fob the whole car seemed dead,no light anywhere searched internet for a solution NOTHING.
Went out to the car in the morning pressed open button opened straight away a though nothing had ever been wrong..
I took it to the independent dealer they couldnt fault the car only needed updates they told me ...mmmmmmmm
They did say at this point everything is upto date but your battery lead has a old part number but we wont change it because we aren't able to fault it
I Got the car back and it was ok for maybe a week or more then this time i was on my way to work in RAIN ,arrived in the car park pressed the stop button and all life was gone again,Key stuck in ignition doors locked no lights anywhere.
i was trapped in the bloody car i reached over to the passenger side that door was open ,as i was trying to workout how to get out it all came back on,
That night drove home fine..
The next time i had issues was about 3 days later going home in rain again (didnt we have some rain ) on cruise 70ish ABS Warning came on Driver Assist ?? came on drive with care cruise went off I Drive screen flashed went off and back on again... no engine issues car was driving.
Parked car on the drive when i got home turned it off straight back on and all fault and error were gone.
Te car went in a total of 3 times and no faults where found i was now getting worried i spent hours on the net my head was buzzing what is this gunner cost ,the dealer told me if the fault appears again it will have to go to the main dealer we have spent hours on it and found nothing all areas of the car that do sometimes get water in are bone dry.
It Happened again on the drive one morning opened the car with the fob put gear in the boot put key in ignition pressed start button DEAD all lights went off key stuck in the ignition.
It was like this for hours so thi independent said we will get it recovered an have a look as this time it wasnt coming back on ,when it arrived at the dealer ............It drove off the truck Greeeeeeeeeeeeeeeeeeeeeeeeeeee
It Stopped there over the new year while i spent a lot of time on the net again but through all the rubbish i noticed IBS (Intelligent Battery Sensor)
I thought whats that then ,common fault ,allowing moisture in , updated twice from 2005...,this got me thinking.
After the holidays i rang the ind dealer and asked whats this IBS he said its that cable that i told you about !!! ,but we wont change it because it might not fix the issue because the fault you are discribing dont really point to it been that .
To cut a very long story slightly short i bit the bullet and payed for the IBS replacing ,i have had the car back now around a week and nothing has happend yet the car feel loads better and i have just done around 20 mile in the rain not a fault
I Used to get the battery drain warning while stationary thats gone too
I know its a bit long winded but you never get all detail when you search the net and i am now 99% certain the fault is cured
12427603567 IBS Battery Lead
61129123572 IBS Adaptor Lead
12517615476 Adapter Lead
Car is a 05 (55) 530D Touring
UPDATE STILL HAD NO ISSUES AND WE HAVE HAD LOADS OF SNOW FINGERS CROSSED.... 01.02.13