About the Crux SWRBM-57 Wiring Interface
Wire in a new radio
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
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.
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.
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
- Our 60-day money-back guarantee
- 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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More details on the Crux SWRBM-57 Wiring Interface
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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 | |
| 3 Series (E90/91/92) | 2005-2012 | Quadlock | ||
| Mercedes | A-Class (W169) | Audio 5 | 2004-2010 | ISO |
| Quadlock | 2004-2010 | Quadlock | ||
| B-Class (W245) | Audio 5 | 2004-2010 | ISO | |
| 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 | |
| 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.
Wiring Harness: The SWRBM-57 includes two wiring harnesses; there is a 2-connector factory harness (16-/10-pin) and a 1-connector (44-pin) factory harness. Only one will be used based on the type of factory plug behind your radio. Each harness also features a 12-pin connector that plugs into the SWRBM-57 interface module. The wiring harness also provides bare-wire leads (power/ground, speaker, illumination, turn-on, and navigation) which will need to be hardwired to your aftermarket head unit's wiring harness.
| Wire Color | Function |
| Black | Chassis Ground |
| Red | +12 Volt Accessory |
| Yellow | +12 Volt Constant |
| Orange | Illumination |
| Blue | Amp Turn-On |
| White | Left Front Speaker + |
| White/black | Left Front Speaker - |
| Gray | Right Front Speaker + |
| Gray/black | Right Front Speaker - |
| Green | Left Rear Speaker + |
| Green/black | Left Rear Speaker - |
| Purple | Right Rear Speaker + |
| Purple/black | Right Rear Speaker - |
| Purple/white | VSS (vehicle speed sensor) |
| Red/white | Reverse |
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Customer Q&A
8 questions already asked
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I own a 2000 Mercedes Benz E320 wagon. I used this harness when converting my factory single DIN setup to a double DIN Alpine ILXW650 setup. This harness is perfect! I retained all steering wheel controls, everything works as it should, and it was a breeze to install. Thank you!
Edward from GARNET VALLEY, PA