Just sharing..
The ASC has a control module right in front of the Brake Servo. If this thing breaks... it will cost >rm4k and it has to be programmed after installation. So don't toy with your ASC unnecessarily. It is a known but not that common part change for E46 and E39. That is why it is listed in the "tell tale lignt" topic in your car manual.
Someone told me but he can't prove this technically, if you add accessories that increases the car's electrical demand, it may potentially damage control units and ASC is one of them. I had aftermarket HIDs & Angel Eyes, 2 Amps and 2 woofers... end of last year... my alternator and followed by my ASC broke... total cost ~RM8k. So now.. all of these aftermarket has been removed... only 1 amp and a small woofer.
planta