BMW E39 540 electronics
Discussion
Hi,
The electronics on my 98 540 is playing up intermittently. Frequently when turning the ignition on, the music console, phones, wippers and horn don't work. They come back on after some varying time after the car's been running for maybe 5 to 15 minutes. Anybody else seen this? Is this something I can fix myself. Thanks.
The electronics on my 98 540 is playing up intermittently. Frequently when turning the ignition on, the music console, phones, wippers and horn don't work. They come back on after some varying time after the car's been running for maybe 5 to 15 minutes. Anybody else seen this? Is this something I can fix myself. Thanks.
The one that I keep hearing about is the dash going freaky, speedo not working and the rev counter going wild. Funny thing is though - the gear selector indicator works fine. Turns out that the CD changer can go potty and it freaks the whole bus electronics out - in this case its the dash....
So I would check what you have and try disconnecting a few things - like CD changer, phone if you have it and even the stereo too. Eliminate what the options are and see if things return to normal. Also try disconnecting the battery (its not as hard or dramatic as you might think) as this will reset everything (well most things) to their standards again. It should work, but since everything is connected to the bus then it could be anything.
Oh, and check all of your lights (have you upgraded the lights?). Any dead bulbs or dodgy connections should be checked and fixed. Again, the light module for the headlights (with aftermarket xenons or angel eyes) have been known to confuse the hell out of the system too....
Usually the electronics are very solid, its just that you get really weird problems when something does go screwy....
So I would check what you have and try disconnecting a few things - like CD changer, phone if you have it and even the stereo too. Eliminate what the options are and see if things return to normal. Also try disconnecting the battery (its not as hard or dramatic as you might think) as this will reset everything (well most things) to their standards again. It should work, but since everything is connected to the bus then it could be anything.
Oh, and check all of your lights (have you upgraded the lights?). Any dead bulbs or dodgy connections should be checked and fixed. Again, the light module for the headlights (with aftermarket xenons or angel eyes) have been known to confuse the hell out of the system too....
Usually the electronics are very solid, its just that you get really weird problems when something does go screwy....
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