Explanation of E39, E38, E46 Car Phone Wiring
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Description of Female DB25 Connector
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Location: Trunk left side
To connect: You need a DB25 male

Pin 1 RJ45-Pin 2
Pin 2 Not Used
Pin 3 Ground
Pin 4 Unswitched 12V (+)
Pin 5 Ignition 12V (+)
Pin 6 RJ45-Pin 1
Pin 7 Not Used
Pin 8 RJ45-Pin 7
Pin 9 Not Used
Pin 10 Radio Mute (Provide Ground to Mute)
Pin 11 RJ45-Pin 6
Pin 12 RJ45-Pin 5
Pin 13 Not Used
Pin 14 Microphone (+)
Pin 15 Microphone (-)
Pin 16 Ground
Pin 17 Unswitched 12V (+)
Pin 18 RJ45-Pin 4
Pin 19 Speaker (-)
Pin 20 Ground for Microphone
Pin 21 Not Used
Pin 22 Not Used
Pin 23 RJ45 Pin 8
Pin 24 RJ45 Pin 3
Pin 25 Speaker (+)

Description of RJ45 Connector
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Location: Under console
To connect: You need a RJ45 male

Pin numbers are for male RJ45

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12345678

Pin 1 DB25 Pin 6
Pin 2 DB25 Pin 1
Pin 3 DB25 Pin 24
Pin 4 DB25 Pin 18
Pin 5 DB25 Pin 12
Pin 6 DB25 Pin 11
Pin 7 DB25 Pin 8
Pin 8 DB25 Pin 23

Antenna Cable (mini UHF - RG-58 Cable)
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Location: Left side of trunk

There are two (one male + one female) cables in the trunk. Use the male if
you mount your cellular transceiver in the trunk. Connect the male
and female together if you intend to mount the transceiver near the console.

Location: Console

There is a male cable under the console which can be used by following above
instructions.

AndrewP