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BMW 5 Series, Electrical
#12 of 36 Electrical problems with 2008 BMW 535
Feb 10, 2010 (1:55 pm)
Has anyone heard of reports of water leakage and electrical problems with 2008 535's? I have the wagon and apparently water leaks in through seals in the sunroof and, instead of draining as designed, water flows to the "trunk" area where all of the electronics are located. The result is a complete electrical short and failure (we're talking TPM, airbags, ABS, level systems, etc). This has happened to my vehicle 3-times in an 18-month period and BMW has been less-than-helpful. I'm interested in learning if this is a common problem with this make/model/year or if I just have a bad car.
#13 of 36 Re: BMW 5 series battry issue [professor6]
Feb 24, 2010 (11:58 am)
Greetings Re: BMW 5 series battery issue [professor6]
I've read through most of the thread on your electrical problem but one thing is not clear to me.
Are you talking about the interior ventilation fan or the engine cooling fans?
To the point, the engine cooling fans are thermostat activated and will run if the sensors say the motor/water temperature is to high.
Many good ideas posted here but one that no one touched on.
The interior lights are activated by a switch on each door. Many years ago this was
a small button style switch located near the door hinges. In Particular BMW has gone to a "Door guide switch" to activate the interior lights. I'm speaking about that black & aluminum bracket located on the C Post between the front & rear doors.
Check those to insure the switch portion is working correctly.
There is also a gas cap door switch which I believe is electrical, make sure that's in working order. You may have to pull the trunk side panel out to get to the switch
and related wires.
One last area! I had a 1990 BMW 5 series and found a bunch of electrical relays located under the rear seat bottom. Good place to look and check for loose connections.
Battery trickle chargers are great little device. I'm not sure why I should have to buy one of those for an automobile, made in Germany, that cost $40K or more, but that's me.
Good luck with those electrical Gremlins.
#14 of 36 Re: Electrical problems with 2008 BMW 535 [jim367]
Mar 09, 2010 (10:11 pm)
>--Electrical problems caused by water damage in trunk
I have a 2006 530 wagon (with 46,000miles) that has the same exact problem. Brought it to Dinan and the tech is still trying to figure out the extend of the damage and the cause of it all. So far, he's found 5 panels in the trunk area all rusted and corroded, an puddles of water under the spare tire and battery. He need to first replace these to check further since the computer is not communicated all the way through for fault codes. My I-drive is also dead. Unfortunately the warrenty expired 11/09. The dealer tells me it's not a common problem at all (of course not). Is your problem fixed? What was the cause and cost for repair? Thx much!
#15 of 36 BATTERY DISCHARGING
Apr 05, 2010 (7:51 pm)
My 2002 525it's battery kept discharging when not in use. I traced it to the vehicle system not going into sleep mode. It took a while trouble shooting but after disconnecting the factory navigation system it would go into sleep mode. I disconnected it by removing the two connectors at the back of the nav unit. Only thing is, now, not only do I not have any nav but my monitor is also dead so I cannot adjust the clock, radio tone settings, etc. The battery however keeps a charge. Any idea of a fix??
#16 of 36 Re: Electrical problems with 2008 BMW 535 [jim367]
Apr 24, 2010 (12:41 pm)
I have similar problem on my 2008 BMW 535i where water/liquid inside trunck damaged caused module failure and as a result see TPM and Electric Malfunction messages. BMW NA is not willing to pay for labor charges. This looks like common problem and BMW should fix their design and now cover this under warranty. If not I will take this up to BBB and Consumer court and not sure who else can help me out here.
#17 of 36 Electrical problems with 2008
May 11, 2010 (1:33 am)
There is a technical bulletin out for those trickle chargers.
Here's the text:
Battery maintenance requirements from the Owner’s handbook
If your car is driven only for short distances of less than 10 miles over a prolonged period of time, without an occasional drive at highway speeds, the engines charging system will not properly maintain the battery.
Insufficient use of the vehicle could result in short term starting problems and in the long term could damage the battery.
In case the car is not operated for several weeks it is advisable to:
A. Consider using a proper trickle charger, following the charger manufacturer’s
instructions, to maintain the battery’s state of charge.
Advanced Battery Charging System with Alligator Clips
This Advanced Battery Charging System can help you extend the life of your battery. Simply plug the 1.25-amp charger into
a standard 115-VAC wall outlet and connect the alligator clips to your terminals under the hood. The device's on-board
microchip monitors and regulates the charge- virtually eliminating sulfating. It can even help extend the life of your battery.
(PN: 82 11 0 406 881)
B. Consult your BMW center regarding battery removal.
Once removed, the battery must be charged and stored in a cool, dry place where it can be protected
If the battery will be stored for over 3 months, it must be recharged every 3 months, or else it will become
damaged and useless.
#18 of 36 Re: Electrical problems with 2008 BMW 535 [jim367]
Nov 09, 2010 (7:46 pm)
I have a 2006 530i and got the same problem, iDrive is dead due to water somewhere in the trunk, i have found 3 blown fuses but replacing them didn't help.
What part is most likely affected by this, assuming located in the trunk, and how the water got in there?
Any ideas would be appreciated.
#19 of 36 Re: Electrical problems with 2008 BMW 535 [majko]
Nov 09, 2010 (8:54 pm)
My water damage came from clogged sunroof drainage caused by crushed leaves. The leaves that were blown in while leaving my sunroof vent open were crushed when the sunroof is retracte. Five electrical panels in the truck were all fried and need to be replaced. You may be able to detect rust or water underneath the spear tire. My insurance paid for the repairs due to water damage. Good Luck.
#20 of 36 Re: Electrical problems with 2008 BMW 535 [5series]
Nov 10, 2010 (6:35 pm)
Woow, thanks for the reply, my problem is going to be the same, roof was retracted when slightly rained, I forgot to close it.
Do you know by any chance what electrical components were replaced in your car ? There are several in the trunk, stereo equipment is there also, amplifier etc...
If you still have the paperwork from the repair, maybe they listed the panels they replaced.
Thank you very much for any help you have.
#21 of 36 Re: Electrical problems with 2008 BMW 535 [majko]
Nov 10, 2010 (10:36 pm)
there were 5 panels: Air supply, micro power module, tailgate lift, PDC, Satelite Radio.The trunk only floods if there is debris blocking the end of the drains.