Since a few members have asked questions about this, I figured I'd throw this up here.
I did this a little over a year ago on my '03 325i with the Business CD.
This is similar to both the directions provided with the kit as well as other DIYs out there with the exception of the fact that I mounted the input jack in the sunglass tray.
What you need:
BMW OEM Auxiliary Input Kit (around $35)
Phillips head screwdriver
Non-marring prying tool for trim removal
Drill bit (1/4" according to other DIYs but eye up the size yourself as I did this a while ago and don't remember the size bit i used)
Microfiber towels to cover area around shifter
1. Disconnect battery.
2. Use your pry tool to begin to work the trim piece over the glove box out. The trim is essentially friction mounted-- straight pegs on the back of the trim press into the red rubber mounting holes you see in the pic below. Work the trim piece out until you can get a grip on it and then pull it straight out.
3. Now do the same for the trim piece over the radio.
4. Remove the two Phillips head screws holding the radio in the dash (already removed in the trim pic above).
5. Slide the radio out and disconnect the electrical harness and antenna lead. Before sliding out radio, place mf towel around area of shifter so you have somewhere to rest the radio unit while you disconnect without scratching trim.
6. Insert the OEM input into the electrical harness. To do this, you will have to first pull up on the blue locking tab. Seat the OEM input into the harness and replace the blue locking clip.
Input seated in harness, blue clip removed.
Input seated in harness, blue clip positioned.
Input seated and locked.
7. Now for the sunglass tray mod-- Remove the sunglass tray by opening the flip door and pushing up on the tabs shown in the picture while working the tray out. IIRC, I used a small screwdriver to get the right leverage on these while I pulled.
8. Using your drill bit, drill a hole in the back of the sunglass tray where you would like the input jack to sit.
9. Feed the aux input wire down behind the climate control unit and into the space where the sunglass tray mounts. Mount the input jack to the hole you drilled in the sunglass tray.
10. Manage your excess cable and make sure there is sufficient room to slide in both the radio and the sunglass tray.
11. Reinstall the sunglass tray-- just push it back in its home until it locks into place.
12. Reconnect the electrical harness and antenna lead to the radio. Replace the radio and secure with the Phillips head screws.
13. Replace trim pieces in the order they were removed. Just press them straight into the mounting holes.
14. Reconnect battery.
15. Turn on radio and cycle your MODE button until you see the AUX option displayed.
16. Connect the MP3 of your choice and get some tunes rolling.
17. Use the settings button to get to the AUX LEVEL display and adjust the aux master volume to a setting that works for you (I think it goes from 1-5). This setting is a master setting for the AUX input. Volume is still controlled from the volume knob and steering wheel controls.
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Originally Posted by Tampa330i
