Shown below are the pins wires coming out of the factory STEREO HEAD UNIT

1998 BMW 328i Stereo Head Unit Connections

First group of 16 PINS

Pin 1 Yellow Red Wire no connection
Pin 2 Blue Red Wire PIN 16 HIFI Amplifier (2nd group)
Pin 3 Yellow Black PIN 3 HIFI Amplifier (2nd group)
Pin 4 White Brown Wire Telephone Conn
Pin 5 Violet White Wire FUSED Battery Supply
Pin 6 Blue Black Wire Pin 2 HIFI Amplifier (2nd group)
Pin 7 Yellow Wire lower PIN 2 CD Changer
Pin 8 brown orange wire PIN 17 HIFI Amplifier (2nd group)
Pin 9 Red White Wire FUSED Batery Supply and PIN 1 HIFI Amplifier
Pin 10 Black White VSS Output of Instrument cluster
Pin 11 Brown orange Wire PIN 14 HIFI Amplifier (2nd group)
Pin 12 Brown orange Wire PIN 4 HIFI Amplifier (2nd group)
Pin 13 Grey Red Wire Interior light System
Pin 14 brown Orange wire PIN 1 HIFI Amplifier (2nd group)
Pin 15 Brown wire GROUND WIRE left side of Dash
Pin 15 ?White wire PIN 2 (1st group) HIFI Amplifier

SECOND Group of 10 PINS

Pin 1 Yellow Wire Pin 9 CD Changer
Pin 2 Blue Wire pin 10 CD Changer
Pin 3 Brown wire Pin 2 CD Changer
Pin 4 Grey Wire Pin 7 CD Changer
Pin 5 Black Wire Pin 3 CD Changer
Pin 6 Green Wire Pin 1 CD Changer
Pin 7 Violet Wire Pin 8 CD Changer
Pin 8 not available
Pin 9 Red Wire Pin 6 CD Changer
Pin 10 White Wire Pin 4 CD Changer

If you need a detailed stereo wiring diagram, please check with ATS

Legend

LF left front
LR left right
RR right rear
RL right left
RR right rear
SPKR Speaker
GROUND ground supply connection
(+) positive wire connection
(-) negative wire connection

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