Name: Crux SWRBM-57 Wiring Interface
Brand: CRUX
SKU: 249SWRBM57
Price: 129.99 USD
Availability: InStock
Rating: 4.5 (53 reviews)

by Crutchfield's Dave Delamere

Wire in a new radio

Crux's SWRBM-57 interface ensures that you can keep the steering wheel audio controls and the factory analog amplifier in your vehicle when you replace the factory radio. Connect this interface to the wires on your new stereo's wiring harness, and you've covered the power, ground, and factory speaker connections for your new stereo.

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You'll only be able to retain your steering wheel audio controls with a compatible car stereo made by Alpine, Boss, Blaupunkt, Clarion, Dual, Jensen, JVC, Kenwood, Pioneer, Sony or Soundstream. No other brands are currently compatible.

Wire in a new radio

The SWRBM-57 interface also offers the parking brake, reverse, and Vehicle Speed Sensor (V.S.S.) outputs that you'll need if you're installing a navigation receiver.

Note: This adapter will not work with the digital amp used in some systems. See Details for a list of compatible car stereos.

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Product highlights:

connect a new stereo in select 1999-2013 BMW, Porsche, Mercedes-Benz, and Smart models
retains steering wheel audio controls with select car stereos
provides connections for Vehicle Speed Sensor (V.S.S.), reverse gear, and illumination for installing navigation receivers
warranty: 1 year
MFR # SWRBM-57C

What's in the box:

Crux SWRBM-57 Wiring Interface owner's manual

Radio replacement interface module (for BMW/Mercedes)
2 Wiring harnesses
2 SWC harnesses
Installation Instructions

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Researched by Crutchfield's Stacey B.

The Crux SWRBM-57 Wiring Interface replaces these items:

Scosche LMZ20 Wiring Interface

Product Research

Features

Radio Replacement Interface: The CRUX SWRBM-57 is a radio replacement interface for select BMW and Mercedes vehicles. It facilitates the integration of an aftermarket radio to enable retention of factory features when replacing a factory installed radio. This interface is also pre-programmed for retention of steering wheel controls.

Compatibility: The CRUX SWRBM-57 is supported by the following BMW and Mercedes vehicles; with non-amplified or amplified factory audio systems including Bose (except Bose with fiber-optic amplifiers). Not compatible with vehicle's featuring fiber-optic digital amplifiers.

Make	Model		Year	Harness
BMW	1 Series (E81/82/87/88)		2007-2013	Quadlock
BMW	3 Series (E90/91/92)		2005-2012	Quadlock
Mercedes	A-Class (W169)	Audio 5	2004-2010	ISO
	A-Class (W169)	Quadlock	2004-2010	Quadlock
	B-Class (W245)	Audio 5	2004-2010	ISO
	B-Class (W245)	Quadlock	2004-2010	Quadlock
	C-Class	W203	2000-2003	ISO
		W203	2000-2006	Quadlock
		W204	2007-2012	Quadlock
	CLK-Class (W208)		1999-2002	ISO
	E-Class	W210	1999-2000	ISO
	E-Class	W212	2009-2012	Quadlock
	M-Class (W164)		2005-2011	Quadlock
	R-Class (W251)		2006-2011	Quadlock
	SL-Class (R230)		2001-2004	ISO
	Sprinter (W906)		2010-2017	Quadlock

Note: Two vehicle harnesses (Quadlock or ISO) are included with the interface; you will only use one of these harnesses based on your type of vehicle.

Steering Wheel Control Retention: The CRUX SWRBM-57 also features a steering wheel control output for Pioneer, Sony, Alpine, Clarion, Kenwood, JVC, Jensen, Dual/Axxera, Boss and other aftermarket head units. The steering wheel control output consists of a right-angle 3.5mm connector and a light blue/yellow wire (use the connection that your aftermarket head unit is fitted with). The SWRBM-57 interface module will work with any of the listed aftermarket head units, by setting its three dip-switches (see owner's manual for appropriate setting).

Note: The steering wheel control harness features two 4-pin connectors (labeled - Pioneer/Sony and Alpine/Clarion/Kenwood/JVC). You will only plug in one of these connectors to the interface module, based on the type aftermarket head unit you are installing.

Navigation Outputs: The CRUX SWRBM-57 radio replacement interface module provides a VSS (vehicle speed sense) and a Reverse Gear output to make installing an aftermarket Navigation radio simpler and less time consuming.

Amp Turn-On: The CRUX SWRBM-57 provides an amplifier turn-on lead for your vehicle's factory analog amplifiers (if equipped). This adapter is not compatible with vehicles that feature fiber-optic, digital amplifiers.

The Crux SWRBM-57 Wiring Interface replaces these items

Scosche LMZ20 Wiring Interface

Connect a new car stereo while retaining steering wheel controls in select 2006-11 Mercedes-Benz vehicles

7 reviews

retains important factory features, including steering wheel audio controls
includes connections for a GPS receiver

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9 questions already asked

I have a 2002 CLK 320. Will this work for replacing the head unit and keeping the factory amp and steering wheel controls?

ravidgecko May 08, 2023

1 answer

This harness can work in some 2002 Mercedes CLK 320's, Raul. This works in models with Bose, and without factory navigation. We need to know the specific details of your exact vehicle to provide any confirmed fit. Use our handy Vehicle Guide in the link below to enter your ride's specific details and trim level. We will list all the radios that fit and pair with the install gear we have available. This harness does NOT retain any factory Bose amp and does bypass it. It appears that all harnesses we have for your vehicle if you have the premium Bose will not retain the factory amp. I hope this helps!

bo May 09, 2023 (Staff)

I have a 2002 Mercedes E320 sedan without GPS head unit. Time to replace it! I want to maintain the use of original BOSE amp and speakers. The connection from the head unit to the amp is via fiber optics. I have not found any adapters that will work with the digital amp. Suggestions?

paul Jan 09, 2023

1 answer

Greetings Paul, and thank you for your question. We have been offering a standard analog wire adapter for the 2002 E320 for a number of years now, and still do. I checked our database for your E320 and saw nothing mentioning fiber optic from the radio to the amp. This Crux SWRBM-57 is the recommended wire adapter for your vehicle.

hogan Jan 10, 2023 (Staff)

Is this harness compatible with Alpine CDE-SXM145BT to be installed in a 02 C320 Mercedes? Has a Bose system not sure of fiber optics?

julian May 20, 2022

2 answers

In my 2000 E320 my system was all factory with me changing the head unit. The harness worked with everything except the steering wheel controls. The controls have never worked. The speakers are Bose.

tollef May 21, 2022

I don't know for sure. You will need to remove the head unit and see if it has the fiber optic connector on the back.

cameo May 20, 2022

I plan to replace my factory stereo with Sony XAV-AX150 in a 2006 Mercedes Benz CLS 500 with Harman Kardon. Will this work?

alvin Mar 04, 2022

1 answer

Hey, Alvin!! Bill here, in Greensboro, NC. I used the wiring harness you are looking at from Crutchfield in my 2001 E320; the original radio and multi-cd player needed upgrade, and I wanted to keep steering wheel button operation. If your CLS has similar wiring, you should be good with this harness. All the normal functions (vol up/down, preset up/down) work as they should. I had a local shop do the install-just ran out of time-and they reported no issues. Good luck!

bill Mar 04, 2022

Replacing factory radio with Boss radio in a 2003 Mercedes SL500. Need to retain steering wheel controls and connect factory speakers. Will this fit?

kristine Sep 05, 2021

3 answers

Everything fit great in my application...BUT! There are different kinds of factory stereos in the MB E300's of that year. Make sure you know what you have and order the right stuff.

roger Sep 08, 2021

The system recommended for my '02 e320 worked flawlessly when I replaced the factory set up.

john Sep 06, 2021

Hi I used that harness for my 2000 MB E55 and it work for my car. Not sure for SL500. Crutchfield rep helped me greatly and really worked on me the whole time. So far the issue i'm having is the Clock not working, meaning I can't change it using my dash control and also the steering control. Hope I helped in some ways Thanks, joey

joey Sep 06, 2021

Does this fit 2005 Mercedes Benz c230 with Harmon kardon with amp?

jacob Apr 12, 2019

1 answer

It does work in those vehicles as long as they also came without factory installed navigation. It does not integrate to the stock amp so that needs to be bypassed by running new speaker wire My Bio: https://www.crutchfield.com/bio/Paul

jason Apr 22, 2019 (Staff)

Will it work in a Mercedes 2008 E350 with Harmon Kardon?

steve Apr 13, 2018

1 answer

You can check to see if this will fit your vehicle by using our Outfit My Car tool: http://www.crutchfield.com/car/carselector.aspx For additional details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.

kristina Apr 24, 2018 (Staff)

Does this work with a 2008 Mercedes C300 (W204) with Harman Kardon systems which I believe has an amplifier?

timonthy Dec 30, 2017

1 answer

Yes. The Crux SWRBM-57 is a recommended integration harness for the 2008 Mercedes C-series with factory Harman Kardon audio. You will find all of the stereo models and recommended installation accessories for your vehicle by using the "Find What Fits" application on the main Crutchfield website: https://www.crutchfield.com/car/carselector.aspx?lp=%2fCar%2foutfitmycar%2fmycar.aspx For additional assistance and personalized recommendations, feel free to contact us directly by phone or through our online chat service: https://www.crutchfield.com/support/ContactUs.aspx

ryan Jan 05, 2018 (Staff)

do i need this hole kit to diy ?what about my car has a sepret 6disk changer in the trunk and a deleted phone hand set in the old stereo. im installing, a jenson 7 in screan retractable head unit.can i bypathat pasenger can watch the tv screan?

john Jan 10, 2014

1 answer

This will depend largely on your vehicle. For details on installation please contact an Advisor by phone or online chat. They will be able to pull up your vehicle and give you the details on what you will need for an installation, as well as answer your additional questions.

jeff Jan 10, 2014 (Staff)

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