Tools and Equipment You Will Need
Phillips screwdriver. small size
Soldering Iron. thin point
Solder. thin, flux core
Drill + metal bits. You'll need a 1/4" and a 3/8" bit.
RCA-headphone cable. This goes from our new AUX input to a MP3 or a CD player
Crimps. Because apparently soldering the harness is bad, according to latest research.
2x RCA jack. Get one Red and one White
3x 2" pieces of wire. Conventionally, Red, White, Black (or whatever colors you prefer)
The radio
The radio model I am modifying here is a C33 tape deck from a 1998 BMW 323is.
It has a top. And a bottom. (this picture is of the bottom)
It also has a back, on which we see four plugs.
Starting from the right, we have the Big, L-shaped connector, with a 7.5 amp fuse over it, as well as the smaller, 10-pin I-bus connector. The pinout for these connectors, reproduced from here, where there is also more useful information about CD-changers:
I'm not entirely sure (yet) about the lack of separate grounds for front and rear speakers, I've seen pins 8 and 11 used in addition to 12 and 14 to provide four separate grounds on another diagram.
The I-bus connector does not concern us, although there may be a way of hacking it to provide AUX input instead of the tape.
Then, in the middle, we have the 'Diversity Reception Antenna Control' jack, and finally, leftmost, the antenna jack.
In the very center is a metal extension forcefully screwed into the backing plate and covered with a plastic sheath. I have no clue what it does, but I'm removing it because it annoys me.
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