Aerpro SWSU12C Steering Wheel Control Interface
Installation Guide for Subaru Vehicles
Product Overview
The Aerpro SWSU12C is an interface designed to retain steering wheel controls and other vital vehicle features when installing an aftermarket head unit into compatible Subaru vehicles. It features selectable dipswitches for specific applications, ensuring seamless integration.
Vehicle Application
To Suit Subaru Models:
- Levorg VM (2016-2020) *
- Impreza GK, GT (2017-2021)
- XV GP (2016-2017) *
- BRZ (2017-Up) *
- XV GT (2017-Up)
- Forester SK (2018-Up)
- Forester SJ (2015-2018) *
- Impreza GP, GJ (2015-2016) *
- WRX (2015-2021) *
*Headunit Dependant
Important Note: The following vehicle settings must be confirmed before removing the factory headunit, as they will not be accessible with an aftermarket unit fitted: Rear Camera Time Out, Autolight Sensor, Welcome Lighting, Clock, Interior Light, Defogger, Keyless Entry, and One Touch Lane Change.
Key Features
- Retain steering wheel control functionality
- Replace factory radio
- Outputs for Reverse & Park Brake
- Retain OEM AUX-input
- Retains OEM Parking Camera
- Software updateable
- Remappable buttons
Prior to Installation
Installation requires technical knowledge. Read the manual thoroughly before starting. Select a dry location free from heat sources. Use correct tools to prevent damage. Aerpro is not liable for issues arising from improper installation. Before proceeding, disconnect the negative battery terminal and remove the key from the ignition.
Wiring Key
ISO Connector Wiring Key:
| Wire Color | Description |
|---|---|
| Purple | Right Rear Speaker + |
| Purple/Black | Right Rear Speaker - |
| Green | Left Rear Speaker + |
| Green/Black | Left Rear Speaker - |
| Grey | Right Front Speaker + |
| Grey/Black | Right Front Speaker - |
| White | Left Front Speaker + |
| White/Black | Left Front Speaker - |
| Yellow | Permanent 12V |
| Black | Ground |
| Red | Ignition 12V |
| Orange | Illumination |
Flying Wire Wiring Key:
| Wire Color | Description |
|---|---|
| Green | Park Brake |
| Purple/White | Reverse Gear - 250mA |
| Yellow RCA | Camera |
Outputs & Ratings:
Standby Current: <3mA | Operating Voltage: 6V to 16V | Operating Temperature: -20°C to 85°C (*rated at 25°C)
Dipswitch Configuration
This interface includes selectable dipswitches. Consult the chart below for the appropriate configuration for your aftermarket stereo. To activate a dipswitch, press it downward into the 'ON' position.
| MANUFACTURER | SYSTEM | 1 (ON/OFF) | 2 (ON/OFF) | 3 (ON/OFF) | 4 (ON/OFF) | CONNECTION |
|---|---|---|---|---|---|---|
| RESERVED | NA | OFF | OFF | OFF | OFF | SOFTWARE UPDATE MODE |
| AERPRO | Analog | OFF | OFF | ON | ON | MALE 3.5MM JACK |
| ALPINE | IR DATA | OFF | ON | OFF | OFF | MALE 3.5MM JACK |
| ANALOG SINGLE EXTEND | Analog | ON | ON | OFF | OFF | BROWN SWC IR |
| ANALOG SINGLE WIRE | Analog | ON | ON | ON | OFF | BROWN SWC IR |
| CLARION | IR DATA | ON | OFF | OFF | ON | MALE 3.5MM JACK |
| CUSTOM | IR DATA | ON | OFF | ON | OFF | HEAD UNIT DEPENDANT |
| GRUNDIG | IR DATA | OFF | ON | OFF | ON | BROWN SWC IR |
| JVC | IR DATA | OFF | OFF | ON | OFF | BROWN SWC IR |
| KENWOOD 1 | IR DATA | ON | OFF | OFF | OFF | BROWN SWC IR |
| KENWOOD 2 | IR DATA | ON | ON | OFF | OFF | BROWN SWC IR |
| KEY 1 / KEY 2 | Analog | OFF | ON | ON | OFF | KEY1 / KEY 2 WIRES |
| KEY 1 / KEY 2 EXTEND | Analog | OFF | ON | ON | ON | KEY1 / KEY 2 WIRES |
| PHILIPS | IR DATA | OFF | ON | OFF | ON | BROWN SWC IR |
| PIONEER 1 | Analog | OFF | OFF | OFF | ON | MALE 3.5MM JACK |
| PIONEER 2 | Analog | OFF | OFF | ON | ON | MALE 3.5MM JACK |
| SONY | Analog | ON | OFF | ON | ON | MALE 3.5MM JACK |
| ZENEC | IR DATA | ON | ON | OFF | ON | BROWN SWC IR |
Dipswitch 5 & 6: Reserved for vehicle-specific configuration.
SWC Interface Modes
KEY1 and KEY2
These modes are tailored for analog learning-style radios. The module is designed with a resistor chain for seamless compatibility with this type of head unit.
KEY1 and KEY2 EXTEND
This mode extends each button press to 2 seconds during the learning process. This is useful for steering wheels with buttons that are difficult to hold for extended periods, simplifying head unit programming. It is intended for the teaching process only.
ANALOG SINGLE WIRE and ANALOG SINGLE WIRE EXTEND
This function transmits all unique values through a single IR SWC wire, crucial for learning-style head units with only one learning input wire. The Analog Extend mode functions identically to KEY1 and KEY2 extend but transmits through a single wire.
Connection Guide
Before Installation:
Essential to remove and disconnect the factory stereo. Refer to the vehicle owner's manual or seek professional assistance.
Setting the Dipswitches:
Consult the dipswitch selection guide to select the appropriate configuration. Press a dipswitch down to the 'ON' position. Refer to the diagram for an example of the 'KENWOOD1' dipswitch configuration.
[Diagram: Example of KENWOOD1 dipswitch configuration with switches 1, 3, and 4 ON]
Installation Steps:
- Connect the 16-PIN head unit connection lead and the 18-PIN steering wheel harness connectors to their respective ports on the interface.
- Connect the head unit connection lead to the steering wheel remote input on the aftermarket stereo. Connection methods vary (3.5mm jack, SWC IR wire, or KEY1/KEY2 wired inputs). Refer to the aftermarket stereo's manual for specifics.
- Connect the power/speaker ISO connector from the interface to the corresponding ISO connection on the aftermarket stereo. For stereos without ISO, refer to the "Wiring Key" on Page 2. Some interfaces have extra "flying" wires for parking brake, reverse gear, and speed pulse.
- Connect the vehicle-specific connectors from the interface harness to the corresponding connectors on the vehicle harness.
- Connect any flying wires on the harness to the rear of the stereo, if applicable.
- Connect the antenna adapter to the vehicle's existing antenna connection.
- If installing an aftermarket reverse camera, connect the yellow RCA from the harness to the camera's yellow RCA.
- If installing a DAB antenna, connect the DAB aerial connector to the rear of the new stereo.
- After connecting all wires and accessories, thoroughly test the stereo and steering wheel controls before reassembling the dashboard. If controls are unresponsive, check connections and dipswitch settings. Repeat steps if necessary.
Steering Wheel Control Configuration
The steering wheel buttons listed below offer flexibility for re-configuration or dual functions, depending on the vehicle and aftermarket radio support. Each button can be programmed for a short press and a long press command.
[Diagram: Illustration of Subaru steering wheel buttons labeled A through H]
- A: Volume Up
- B: Volume Down
- C: Track Up
- D: Track Down
- E: Source
- F: Voice Control
- G: Pick Up
- H: Hang Up
Note: The provided diagram is an example; actual steering wheel control configurations may vary by vehicle.
Button Remapping
Button remapping can be performed via PC, MAC, or smartphone using the USB port. Instructions for button remapping are available in a separate guide on the Aerpro website.
Connection Diagram
The connection diagram illustrates the interface components and their connections:
- Head Unit Connection Lead: Features a 3.5mm jack plug for connecting to the aftermarket stereo. Wires include Ground, KEY 2, KEY 1, and SWC IR.
- SWC Interface: The main unit with dipswitches (labeled 1-6) and a USB-C port.
- SWC Vehicle Harness: Includes an ISO connector for the radio harness, flying wires for Camera (Yellow RCA), 3.5mm Jack, Reverse Park Brake, and multiple vehicle connectors. The 16-PIN and 18-PIN harness connectors link to the interface.
[Diagram: Visual representation of the Head Unit Connection Lead, SWC Interface, and SWC Vehicle Harness with their respective connectors and wires.]
For more information, visit aerpro.com.
