Actually the problem happens every time the engine is on and static noice comes from all speakers simultaneously, no matter if I'm using the AM FM or CD most of the time it seems to follow a cycle of about 1.5 minutes. Does this problem may be related to the Idrive center? I found people with similar problem over the web here is what I found but I'm unable to find the TCU connector or the optical flash jumper.
If the noise is static in all audio modes and is emitted from all speakers perform the following checks when the noise is occurring.
1. Disconnect the optical flash jumper located near the glove box. what does this look like?
2. Disconnect the TCU connector. I cannot locate it
3. Replace TCU if after either of the above steps is performed the noise is gone.
thanks for your help.