My Business CD player doesn't work of the sudden in my 1999 E36 328i convertible with the HK system. One day it asked for the code and after it was entered it worked ok. The next day the system did not work at all. I removed the unit and checked the female connector that the systems plugs into. Voltage reading across pin 9 (Continuous positive, terminal 30) and pin 15 (ground, terminal) is 2.08 V. Shouldn't this reading be +12 VDC? If it is supposed to be 12 VDC, it looks like there's a problem with the wiring. Any suggestions for troubleshooting? Many thanks.