It is no secret that there is not a good option for an audio system from Mercedes for the Sprinter.

Our Sprinter came with the standard Audio 15 stereo which is pretty terrible both in functionality and sound quality.  In addition, our Sprinter came with the multi-function steering wheel control, Becker Map Pilot navigation system and backup camera.

System Upgrade

With the upgrade, we wanted to maintain the steering wheel control and backup camera integration with a new head unit.  Additionally, since we live in an area where AM & FM reception are nearly non-existent, satellite radio integration is important.  Lastly, since Google Maps and Waze on the smartphone are generally far superior to car navigation systems or Garmin navigation devices, we opted for an Android Auto capability and forwent a head unit with navigation capability.

I did a fair amount of research online and with aftermarket audio dealers and decided that we would stay basic as far as audio quality goes and apply the budget to the capabilities listed above and possibly upgrade the speakers and add an amplifier some time in the future.

The selected components of the new system are:

• Kenwood DDX9903S Stereo
• JBL Club 9630 speakers for the rear doors
• JBL Club 5020 speakers for the front doors, to replace the factory speakers
• SiriusXM SXV300v1 Connect Vehicle Tuner Kit for Satellite Radio

To DIY or not DIY the installation?

I've never installed a car stereo before, but a $900 labor quote for the install encouraged me to DIY.  Additionally, folks have recommended Crutchfield as a place with great support and expertise.  The final decider was this youtube video Sprinter Radio Install which was helpful letting me know what would be involved in the install.  Note that I did not run into the problems mentioned toward the end of this video even though I used most of the same components.

I ordered the following pieces and parts for the installation based on the advice from Crutchfield:

• Axxess XSVI-9005-NAV Wiring Interface
• Axxess ASWC-1 Steering Wheel Control Adapter
• Scosche CR1294B Dash Kit
• Metra 40-EU10 Antenna Adapter for the antenna (I actually needed 2)

Much like the gentleman in video above, I had called Crutchfield while wiring up the wiring interface and steering wheel control adapter to answer questions that were not clear in the provided instructions.  All of their answers were correct, except one.  They had no answer for integrating the factory backup camera.  My solution was to purchase an additional Metra 40-EU10 Antenna Adapter and splice it to a male RCA plug to connect the camera to the stereo.

The Install

The install and configuration of the wiring is intimidating at first.  There are a LOT of wires.

Taking each component one by one, matching the wire colors between the harness and the adaptor gets you most of the way there.  Researching the Kenwood stereo wiring harness revealed a parking brake bypass hack that prevents the stereo from disabling certain features when the van is in motion.  Of course, the driver should never access these features, only the passenger.  Splicing the green wire from the radio to the black wire is all that takes.

Helpful video with info on the Kenwood Excelon wiring harness

Removing the factory head unit is pretty simple.  There is a cover plate that is pried off from top to bottom with trim removal tools (shown in the video referenced above).  Once the faceplate is removed, there are 4 screws at each corner of head unit.  Remove those and the head unit slides right out.

The back of the radio has the main harness for the speaker wires, power and steering wheel controls.  There are also 4 FAKRA connectors.

• Black, 2-wire COAX for the radio antenna
  • Use the Metra 40-EU10 Antenna Adapter to connect this to the new stereo
• Green, 2-wire COAX for the backup camera video
  • Use the spliced Metra 40-EU10 Antenna Adapter to connect this to the new stereo

• Violet, 4-wire USB connector mounted on driver's side dash
  • replace this with a USB extender since the FAKRA end is not compatible with the new head unit
• Blue, 4-wire leads to the GPS module in the glove box
  • Not used with the replacement stereo

Once everything was wired up and working, the last piece was to run the XM antenna outside.  This was much easier than expected.  The windshield weather stripping has a channel in it that the wire sits in nicely. Run the wire along the windshield weather stripping and down to the front of the door, behind the side mirror, under the door weather strip and up under the dash to the stereo.

Now that everything is wired and tested, it is time to install the head unit into the dash. The bezel that came with the dash kit required some customizing to make it fit properly.  This was not a big deal, except I was being conservative with the modification to not cut too much which caused many trial fittings.  This would have been easier if I had done a dry fitting before doing the wiring.

The Rear Speakers

The van came with front door speakers and tweeters in the dash.  These are terrible, but I first wanted to add speakers in the rear of the van and at the same time take a crack at making interior panels.

The panels are 1/4" luaun plywood covered with 1/8" closed cell foam and then wrapped with upholstery material designed for outdoor furniture.

You can get the foam here: Ebay foam vendor  We got the material from a local JoAnn Fabrics store.  If you shop there, get their coupons from their website, it will save you over half-off.

As luck would have it, when shopping for the speakers, I didn't consider the depth of the speaker and the depth of the pocket in the door.  The end result being that the speakers were too deep for the door. Therefore, I needed some really thick spacers cut in an oval shape to match the shape of the speakers. I cut the oval spacers out of 5/4 inch thick planks. With the spacers in place the back of the speakers were kept from contacting the door skin.

Running speaker wires to the back was pretty simple since I have the headliner out.  I ran the wires back to front along the existing wire harness, down under the A-pillar cover and under the dash.  There is plenty of room under the dash to run the wires to the radio from there.

Since there were no pre-existing rear speaker wires, I had to know where to tap into the wiring harness.  The wire color standard, at least for Kenwood is this:

• Solid is positive, stripe is negative
• Purple - passenger rear
• Green - Driver rear
• Grey - Passenger front
• White - Driver front

The only challenging part of the speaker wiring was getting the wires from the back of the van into the top of the doors.  Here is a good write-up on that.

This was the first project on the van that I thought may be over my capabilities.  In the end though, I am glad I saved the $900 installation and did the job myself.  I learned a crap-ton of stuff and my confidence is building which will help going forward with the rest of the build-out.