My instrument cluster, radio and a/c heat fan all died on my 2000 BMW 540i after a AAA battery replacement. I have tried ways of disconnecting my battery and waiting for the displays to come back, but nothing has taken so far. I did the same thing after a similar incident on my '97 540i and it seemed to work perfectly, I have just for gotten the details of some of the steps. Any insight you have would be extremely helpful!
It is possible AAA worker connected the battery backwards for just a second and got a big spark. This can cause major issues, but sometimes just minor ones, such as blown fuses. Check every fuse for starters. There are also fusible links in the wiring which can be blown.
SOURCE: Engine suddenly dies, all electrical goes out as well
Sounds to me like a poor battery cable connection. I am not familiar with the BMW cable routing but it should be simple enough to follow and repair.
First disconnect the negative cable from the battery and leave it disconnected until the final step.
Dicsonnect the positive battery terminal, clean the battery and cable terminal with a wire brush or light sand paper. Apply some dieletric grease or light coat of chasis grease and reconnect the cable to the battery. Follow the positive cable and do the same procedure to all connections down to the starter. Along this route you may notice a smaller wire connected enroute with a fusable link or fuse. Make sure to check these for loosness and or melted wire coating this can be a sign of a loose connection and your problem.
With the positive cable connections completed and reinstalled. Do the same to the negative cable, remembering not to reconnect the negative terminal to the battery until the very last step.
Sorry I don't have more knowledge of the wiring on the BMW.
Hope that helped.
Good Luck
SOURCE: 2001 BMW 330i..Fan for AC/vent not working?
it's either a fuse or it's a bad blower motor, it could be a bad blower motor resistor but usually you'll get either high or low only, so if you have nothing on any speed, high low etc, and all the fuses are ok chances are it's your blower motor.
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You need to perform a static discharge on the vehicle. Remove both cables from the battery and touch the two cable ends together(you may need a jumper wire) for a few minutes. Reconnect the cables to the battery and check it out.
SOURCE: need the unlocked code for my radio in my 1994 bmw 540i
you'll need to take your VIN and the radio serial number (located on the back of the radio) and maybe even one of the master keys to a BMW dealer and they will look it up for you.
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