SL-Class (R230) 2003 -- 2012: Discussion on the SL500, SL550, SL600

SL/R230: Mpow Wireless Bluetooth Adapter-2005 R230

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Old 02-13-2021, 10:38 AM
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2005 SL55 AMG
Mpow Wireless Bluetooth Adapter-2005 R230

Hi folks. I saw a 2003 SL55 AMG for sale that has a Mpow bluetooth adapter installed. For 2005, I don’t believe mine has an aux input. Does anyone else have experience with how it could be attached? OBD? Thanks in advance for your input.
Old 02-14-2021, 05:25 PM
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2009 SL550 Roadster Diamond White, 2008 CLK550 Coupe Obsidian Black
The 03 and 04 models have the AUX input since they used the old Comand 2.0 (Not APS NTG version Comand systems). Idk if it's possible to add AUX to a Comand-APS 1.0 NTG on W215/W220/R230 models (Others may be able to chime in). It's weird cause the W211/W219/R171 have AUX and they use the same Comand unit version.
Old 02-17-2021, 08:32 AM
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SL 350 R230 (3.7L with AMG Speedshift autobox)
Originally Posted by poppyboy
Hi folks. I saw a 2003 SL55 AMG for sale that has a Mpow bluetooth adapter installed. For 2005, I don’t believe mine has an aux input. Does anyone else have experience with how it could be attached? OBD? Thanks in advance for your input.
Ha, I've been there my friend, I too was banging my head off the wall, as people kept saying "there is an AUX in the glove box or in the centre console", perhaps in the US but definitely not in some UK SL's. So I ended up installing a Bluetooth AD2P Music Adaptor called MR 12V or also known as LA POWER it has Bluetooth music streaming with crystal clear CD quality sound that shows up on the screen and functions with steering wheel buttons. It also has an AUX, USB and phone input too with mic. I use the Aux-In to connect to my 'Pure Sound DAB radio', I already have the Mercedes phone Bluetooth so I did not use the phone mic, when a call is received it will pause whatever method I am using for music, i.e. Bluetooth Streaming, Aux In, USB, Radio, CD showing the call in the screen.
Summary of connections I have to the stock Comand system is now:
  1. AUX In
  2. Bluetooth Music Streaming
  3. DAB Radio
  4. Bluetooth phone calls
  5. USB
  6. CD
  7. DVD
This website has the unit I have, but you can also buy off places like eBay too: https://www.mr12volt.com/LP1603MB

I have a YouTube Channel called 'GrooveOn' where I provided help on installing the adaptor and how to use it with the Comand system to help you:

Installation help:
Using with Comand help:

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Frederick NL (02-18-2021)
Old 02-17-2021, 12:04 PM
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This seems like a lot of trouble to go through when you can use this adapter. Not only is the audio quality excellent, the phone calls, and it provides 2 phone charger outputs one which is a fast charger. For 25.00 dollars. BTW my 2004 Sl500 has no AUX input.
Amazon Amazon


Old 02-17-2021, 12:14 PM
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Former R230, W220 and W221 owner
Originally Posted by poppyboy
Hi folks. I saw a 2003 SL55 AMG for sale that has a Mpow bluetooth adapter installed. For 2005, I don’t believe mine has an aux input. Does anyone else have experience with how it could be attached? OBD? Thanks in advance for your input.
Funny- when I was shopping for an SL, I was specifically looking for a 2003/2004 model because of the AUX input. I didn't want to mess with any electrical components to add bluetooth etc...

Twice now, on my now previous S and SL, after radio/component upgrades, I had all kinds of weird electrical issues after. One was done by an indy and another by Best Buy. Sounded great but electrical gremlins all of the sudden appeared...SAM issues, blown fuses, dying battery etc....costly electrical repairs over and over again

Coincidence? maybe. After that nightmare I vowed to not mess with stock equipment again

Old 02-17-2021, 12:27 PM
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SL 350 R230 (3.7L with AMG Speedshift autobox)
Originally Posted by Gene Fiorot
This seems like a lot of trouble to go through when you can use this adapter. Not only is the audio quality excellent, the phone calls, and it provides 2 phone charger outputs one which is a fast charger. For 25.00 dollars. BTW my 2004 Sl500 has no AUX input. https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1


Hmm., Are you kidding me? Sorry for being blunt but that's like comparing Am and FM radio quality, I've used these toy adaptors they are okay for maybe listening to pod casts, but the sound is dire compared to the real deal, I guess it depends how into your music you are....
Also who wants this ugly thing sticking out from their dash on a luxury SL, you can't close your ashtray?

Last edited by A1EK; 02-17-2021 at 12:36 PM.
Old 02-17-2021, 12:56 PM
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Originally Posted by A1EK
Hmm., Are you kidding me? Sorry for being blunt but that's like comparing Am and FM radio quality, I've used these toy adaptors they are okay for maybe listening to pod casts, but the sound is dire compared to the real deal, I guess it depends how into your music you are....
Also who wants this ugly thing sticking out from their dash on a luxury SL, you can't close your ashtray?
So tell me who doesn't have a phone charger in their ash tray and a cable? As far as quality this model is pretty good hardly AM and does quite a nice job. As for Audio Quality do you really think the stock system is all that great anyway?
Old 02-17-2021, 01:38 PM
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SL 350 R230 (3.7L with AMG Speedshift autobox)
Originally Posted by Gene Fiorot
So tell me who doesn't have a phone charger in their ash tray and a cable? As far as quality this model is pretty good hardly AM and does quite a nice job. As for Audio Quality do you really think the stock system is all that great anyway?
I don't have a phone charger, they went out in the 90's if I recall. I use a slim USB fast charge dual adaptor that allows you to close the ashtray, when not using it, but you can also plug in an right angle USB and still close the ashtray too if required. You will see that I have also added a tiny volt meter too, useful on auto's and cold weather.



Old 02-17-2021, 03:58 PM
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Went out in the 90s? You still need a cable with what you have and what I was talking about. And My 25 dollar ( not 8 dollar ) Adapter has a volt meter too. But the bottom line is It is a Luxury Car but it is far from a Luxury SoundSystem.
Old 02-18-2021, 05:04 AM
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2005 R 230 SL350 (M112 3.7). Sold the 1966 W113 230SL recently
I am so old that I listen to CD’s, and I decided to pick up a cradle from eBay to use an ancient Nokia I had laying around (forwarding from mobile). Thinking: we’ll see what comes next. I must say the stock microphones are excellent, phone quality is 100% also with the top down. Navigation with the latest dvd surprisingly works just fine. As for music, I am scratching myself reading AE1K’s story - just let it be, or modernize? I guess I’ll be lazy again this year.
Reading you guys’ stories with interest. Folks, this is not a competition, we’re here for the fun.


does the trick for me

Last edited by Frederick NL; 02-18-2021 at 05:15 AM.
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