BMW 2005 535d electrical power and computer problems

electrical-wiring
computers
transmissions

#1

My BMW 535d seems to be having power issues. While driving the computer fails… I loose all systems… Auto trans, steering, brakes, tire monitor, GPS etc. Sometimes all the indicator lights flash. I need to pull over and restart the car so computer reboots. Until it happens again. Can’t drive fast with transmission in this condition. I notice if I accelerate fast it seems to provoke the reaction. Before this began to happen, the date and time had to be reset after parking the car overnight a few times. I also notice the battery warning light when pulling over to reboot computer. I had it to the dealer now twice. First time they failed to fix it. They just serviced the car. When pulling out of parking lot of dealer it happened again. I brought it right back. Then they replaced a relay switch that they said was hot. That did not do it. I bought it back again. They’ve now had the car four days. This is BMW Dijon, France. Can it be this is a bad dealership? I find it strange that they can not find the problem… esp now that it is easy to cause it to happen. Any ideas?


#2

My best guess would be a failing alternator.
When electronic devices are not given a consistent flow of electrical energy, they will produce all manner of…strange…reactions.

Have the alternator output checked.


#3

Is there some sort of voltage control on this car as well? And thanks for the advice


#4

I seem to have read somewhere there was a ground issue with some of these BMW’s too… do you know anything about that? And thanks again


#5

You’ve probably seen this, and yes, ground problems can wreak havoc on any car:

http://www.bimmerfest.com/forums/showthread.php?t=304000