CRUX SWRBM-57
Radio Replacement with Steering Wheel Control Retention
For Select BMW, Mercedes Benz and Porsche Vehicles
Product Features
- Retains factory-installed amplified systems (non fiber optic amps only)
- Retains Steering Wheel Controls via built-in, pre-programmed interface
- Provides Reverse gear, Illumination and Speed signal outputs
- Provides 12V Accessory Power Output (2A MAX)
- Includes BOTH Quadlock and ISO harnesses
Parts Included
- SWRBM-57 Module
- SWC Cables
- 40-Pin Quadlock Harness
- ISO Harness
Installation Diagram
This section details wiring connections. The diagram shows connections between the aftermarket radio, the CRUX module, and the vehicle's factory harness.
Wiring Connections:
| Function | Wire Color (CRUX) | Aftermarket Radio Connection |
|---|---|---|
| Illumination (+) | Orange | |
| Vehicle Speed Sense | Purple/White | |
| Reverse | Red/White | |
| Amp Turn on | Blue | |
| +12V Constant | Yellow | |
| +12V ACC | Red | |
| Ground | Black | |
| Right Front (+) | Gray | |
| Right Front (-) | Gray/Black | |
| Left Front (+) | White | |
| Left Front (-) | White/Black | |
| Right Rear (+) | Violet | |
| Right Rear (-) | Violet/Black | |
| Left Rear (+) | Green | |
| Left Rear (-) | Green/Black |
The diagram illustrates connecting the 12-pin connector from the SWRBM-57 module to the aftermarket radio. It also shows two options for connecting to the vehicle's factory harness: a 40-pin Quadlock connector or a 17-pin Slide-Lock connector. The user should use the harness that corresponds to the OEM harness in the vehicle.
3.5mm SWC Cables (Option A or B): Use the proper 3.5mm to 4-Pin cable for your radio. Plug the selected 3.5mm SWC cable into the 4-pin port on the module. For aftermarket radios with separate SWC wires, cut off the 3.5mm plug and connect wires as follows: Red wire to SWC Key 1, White wire to SWC Key 2, and Shield (ground) wire to SWC Ground. The white wire is noted as not used in some configurations. Option A is for JVC & Kenwood (Blue/Yellow wire). Option B has a Black/Yellow wire for Parking Brake Output, which should be capped or insulated if not used.
Troubleshooting - LED Module Feedback
| LED Light Status | Module Feedback |
|---|---|
| Solid blue | CAN recognized |
| Flashing blue | CAN not recognized |
| Solid red | Module providing 12V ACC |
| Red off | 12V ACC OFF |
A mini USB port is present but noted as "Not Used".
DIP Switch Settings
Aftermarket Radio DIP Switch Settings
This table configures the module to communicate with various aftermarket radio brands. Set the DIP switches according to the brand of your aftermarket radio.
| Radio Brand | DIP 1 | DIP 2 | DIP 3 |
|---|---|---|---|
| Atoto, Dual, Fahrenheit, Jensen | OFF | ON | ON |
| Pioneer, Power Acoustik, Soundstream | OFF | ON | ON |
| Blaupunkt, Most off-brand Radio | OFF | ON | ON |
| Alpine | OFF | OFF | OFF |
| Clarion | ON | ON | OFF |
| Kenwood | ON | ON | ON |
| JVC | ON | OFF | ON |
| Boss, Old Sony | ON | OFF | OFF |
| New Sony | OFF | ON | OFF |
Note: For brands like Atoto, Blaupunkt, Dual, Farenheit, Power Acoustik, Soundstream, and most off-brand radios, consult the aftermarket radio's manual to determine if SWC buttons require programming.
SWC Troubleshoot Option
If Steering Wheel Controls do not work or work improperly, switch the internal dip switch from 3V3 to 5V. This may require removing the plastic casing of the module.
Vehicle Applications
Type A: 40 Pin Quadlock Connector
BMW
- 1 Series (E81/82/87/88): 2007-2013
- 3 Series (E90/91) Sedan/Wagon: 2006
- 3 Series (E90/91/92/93): 2007-2012
Mercedes-Benz
- A Class (W169) with Quadlock: 2004-2010
- B Class (W245) with Quadlock: 2004-2010
- C Class (W204): 2007-2014
- C Class (W203): 2005-2006
- CLK Class (W209): 2005-2009
- CLS Class (W219): 2004-2010
- E Coupe (W207): 2010-2017
- E Class (W212): 2009-2012
- M Class (W164): 2005-2011
- Metris (W447): 2016
- R Class (W251): 2006-2011
- SLK (R171) Non Fiber-Optic: 2004-2008
- SLK (R171): 2009-2011
- Sprinter (W906)*: 2014-2018
- Sprinter (W907/W910): 2019-2020
MINI
- Cooper S: 2013
Porsche
- 911: 2004-2011
- Boxster: 2004-2016
- Cayman: 2004-2012
- Panamera: 2010-2016
*To retain the factory Sprinter camera after replacing the radio, use Crux part# FAK-RCAM (sold separately).
** Does not retain fiber optic amplifier.
Type B: ISO Connectors
Mercedes-Benz
- A Class (W169) with Audio5: 2000-2010
- B Class (W245) with Audio5: 2004-2010
- C Class (W203): 2000-2004
- CLK Class (W208): 1999-2002
- CLK (W209): 2003-2004
- E Class (W210): 1999-2000
- E Class (W211): 2001-2002
- SL Class (R230): 2001-2004
Steering Wheel Control Troubleshooting (Alpine Radios)
Note: Identify Alpine SWC learning radios by checking for three SWC cables and a SWC learn menu, instead of a 3.5mm SWC input.
If Interface has one SWR-100 Cable included
- Find the included SWC adapter cable.
If Interface has two SWR Cables included
- Identify appropriate SWC adapter cable. Do not use cable with Blue / Yellow wire.
2 - Prepare the SWC Cable: Cut the SWC cable. You will find a red wire, a white wire, and a ground (shield) wire inside.
3 - Adjust the Module Settings: Set the module to the Pioneer dip switch setting. This configures the module to communicate correctly with the Alpine radio. On Alpine iLX series radios, use Pioneer settings: DIP 1 OFF, DIP 2 ON, DIP 3 ON.
4 - Configure the Alpine Radio: On your Alpine radio, select the setting that includes an adapter for SWC. This ensures the radio will recognize the steering wheel controls. Look for an option like "SWC Adapter" and select "With Adapter".
5 - Connect the Wires: Connect both the SWC1 and SWC2 wires from the aftermarket radio to the red wire from the CRUX SWC cable. Connect the SWC ground wire to the shield (ground) wire of the CRUX SWC cable. These steps should enable the steering wheel controls on your Alpine iLX series radio. The white wire from the SWC cable is noted as not used.
6. Program the SWC: Navigate to the SWC settings on your Alpine radio to assign and test each control function.
Automotive OEM integration | CRUX Interfacing Solutions
