Pre-Wired - where?

[all2kool]

My 1992 525i has badges in the trunk indicating that it is pre-wired for BMW Security, Cell Phone and a CD Changer. Where might these pre-wire hookups be? I did find an antenna lead and 25 pin data cable on the passenger side, I assume these are the Cell hookup - but my main question is where is the CD Changer hookup? Thanks.

[winfred]

it's usually tied up on the left side of the trunk behind the carpet, security system plug is by the battery under the back seat


My 1992 525i has badges in the trunk indicating that it is pre-wired for BMW Security, Cell Phone and a CD Changer. Where might these pre-wire hookups be? I did find an antenna lead and 25 pin data cable on the passenger side, I assume these are the Cell hookup - but my main question is where is the CD Changer hookup? Thanks.