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Old 05-24-2015, 10:31 AM
Buzzz4 Buzzz4 is offline
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Location: Portland, Maine
Join Date: Mar 2013
Posts: 23
Mein Auto: 2005 Z4
Replace factory radio

I replaced my factory BUsiness CD radio with 10 speaker no navigation with a Kenwood KDC-BT958HD and it sounds fantastic. I already replaced the front tweeters and mid-range speakers a couple years ago with the Bavsound Stage 1 speaker upgrade, the sound was slightly better but the FM reception was still bad and I had distortion when I tried to turn the music up. I contemplated on replacing the whole system from head unit, amp to speakers then I was thinking why? I have a convertible lets replace in stages starting with the head unit and see (hear) what happens. I am very happy. I can turn the music up load and there is no distortion. With a clean signal going to the factory amp I am satisified.

I purchased my parts from Sonic Electronics which arrived in 4 days standard shipping. The parts costs $266. A local radio shop wanted $600 for the parts and install which I thought was a good price but I wanted a small project for myself. The parts are;
Kenwood KDC-BT958HD radio
Fascia trim plate - Metra 99-9303
Steering wheel adapter - axxess ASWC-1
Antenna adapter - Scosche VWA3/VWAsB
Wire harness - Scosche VW0sB

I purchased the Scosche fascia plate but I did not like the way the radio protruded from the face.

Here is how my install went.
Remove the vents by releasing the two spring load tabs under the top of the vents. Use a thin screw driver and reach in through the top vents while gently prying out the top with a plastic pry tool. Work one side then the other.
Photo 2
The arrows show the two tabs.
Photo 3
Remove the 2 screws holding in the radio.
Photo 4
The existing wire harness plug and antenna cable.
Photo 5
There is a small plastic tab/nub on the bottom of the opening that will need to be filed down so the new radio trim plate will fit properly.
Photo 6
This is the wire diagram I used to make the connections of the new wire harness and radio. Becareful, there are a few wire diagrams out there but they were not correct for my vehicle. I found this on
Photo 7
This is the wire harness all connected, the splices are soldered and wrapped in heat shrink wrap. This took awhile and make sure you double check your work before you solder. I did not use the RCA plugs from the radio, they are for an after market amp that requires a low voltage input. The BMW factory amp requires the higher voltage so use the wires from the radio.
Photo 8
This is the final product. The radio does not sit flush with the face because the factory radio mount was assembled such that it was flush.
Photo 9
Factory radio

My thoughts on the Kenwood are the gloss front makes viewing the display a little difficult during the day especially with the top down. Changing FM stations you have to walk your way through others since there are now preset buttons but I am finding I am using my I-pod now.

I hope this helps others, I found a lot of conflicting information on aftermarket radio and was hesitant but this worked out really well for me.
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Last edited by Buzzz4; 08-09-2016 at 07:06 PM.
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Old 05-24-2015, 02:28 PM
JerBearr JerBearr is offline
Officially Welcomed to the 'Fest
Location: Murfreesboro
Join Date: Jul 2014
Posts: 254
Mein Auto: Automatic BMW Z4 2.5i
Sweet this helps a lot! I didnt know if you would actually post this or not but Im glad you did. I made a post just a few minutes ago; my situation is a little different though, my amp is fried so I have to replace mine and Im not sure what else that means I do or do not have to replace. lol
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