Help Installing DVD/CD Changer in 98 S500

I ordered a Sanyo 10 disc DVD/CD changer (DV-S100, I think
it is now licensed by SONY) for my 98 S500. The changer come
with a FM Modulator (88.7/89.1 Mhz selectable).

My questions:

(1) Is the connector in the truck only meant for the OE MB CD
changer ? Is there a way to connect this aftermarket
DVD/CD changer to that connector and go through the
CD button on the car's original head unit ? If so, where
can I get an adapter for the MB connector to match the
one on the DV-S100 ?

Or should I forget about that connector and just install
the CD changer with the FM modulator at 88.7 or 89.1 Mhz ?

(2) Is the schematics showing what each wire is for that MB
connector ?

Thanks for your kind help.

Best Regards