Steering wheel button control adapter for Subaru / Toyota ACV SWC 42XSU004-0

Steering wheel button control adapter for Subaru / Toyota ACV SWC 42XSU004-0

Preserve the original steering wheel radio control functions when replacing the factory radio with an aftermarket unit. Depending on the vehicle equipment, available functions and the software of the newly installed head unit, some functions may be limited or replaced by others. Compare the shown wiring connectors with the connectors in your vehicle and make sure they match both technically and visually. Check whether one of the listed OEM head units was originally installed. Before final installation verify vehicle functionality, system settings and correct operation of the steering wheel control (SWC).

Intended for vehicles

• Subaru BRZ (ZC) (01/2017 -> 12/2020) - original OEM head unit.
• Subaru Forester (SJ) (03/2013 -> 02/2015) - original OEM head unit for vehicles with Denso OEM Sat Nav rotary controller at top left.
• Subaru Forester (SJ) (03/2015 -> 08/2018) - original OEM head unit.
• Subaru Impreza IV (G4) (01/2016 -> 12/2017) - original OEM head unit.
• Subaru Impreza V (G5) (01/2018 -> 04/2020) - original OEM head unit.
• Subaru Impreza V (G5) (06/2020 -> 2023) - original OEM head unit.
• Subaru Impreza WRX IV (G4) (08/2017 -> 08/2018) - vehicles with Harman Kardon OEM amplifier are not supported.
• Subaru XV (G4) (01/2016 -> 12/2017) - original OEM head unit.
• Subaru XV (G5) (01/2018 -> 12/2020) - original OEM head unit.
• Subaru XV (G5) (12/2020 -> 2023) - original OEM head unit.

• Toyota GT86 (ZN) (01/2017 -> 06/2020) - original OEM head unit.

CAN Bus information

Connectors and power:

• Connectors: 10-pin / 6-pin / 28-pin Toyota.
• OEM steering wheel control connection: 3.5 mm jack or free wire to the SWC input of the head unit.

Settings:

• Set DIP switches according to the aftermarket unit manufacturer (see the unit manual).

Vehicle compatibility:

• Analog steering wheel control (SWC).

Special cases and warnings:

• Reimported vehicles or vehicles with different software may have limited functionality.

Important additional information

• Compatible with aftermarket head units that have an analog steering wheel control input.
• To fully activate the adapter you must order the connection cable for the specific head unit brand.

General installation instructions

Checks before installation:

1. Check all steering wheel control functions and vehicle settings with the original OEM head unit installed.
2. Disconnect the original radio (OEM HU) with the power off.
3. Check all interface connections to ensure they are correctly connected – with the power off.

Connections and wiring sequence:

1. Set and check the hardware configuration of the interface – with the power off.
2. Check the configuration of the connection cable to the head unit – with the power off.
3. Connect the cable to the head unit according to the aftermarket device instructions.
4. Connect the remaining wires according to the device instructions.
5. Connect the entire installation to the vehicle – connect the main power connection last.
6. Perform the software configuration of the interface according to the product description or manual.
7. Configure the aftermarket head unit (steering wheel control, camera, handsfree, antenna power, etc.).
8. Perform a functional test of the steering wheel controls and communication with the vehicle.

Changing the interface configuration and HU cable:

• Make all changes with the power off.
• After changes, repeat steps 5 to 8 listed above.

In case of interface or vehicle system malfunction:

• Reinstall the original OEM head unit.
• Start the original unit.
• Initiate CAN Bus system shutdown.
• Check the hardware configuration of the interface.
• After shutting down the CAN Bus, repeat steps 5 and 6 above.

When modifying wiring or cable routing:

• Wiring and modifications may only be carried out by professionally trained personnel.
• All changes must be verified for manufacturer approval or impact on the vehicle warranty before connection.
• All modifications must be verified by measurement and compared with the vehicle wiring diagram before connection.
• Modifications are made at your own risk, without guarantee of functionality.
• Modifications are carried out at your own risk, without guarantee against damage to the vehicle, equipment or interface.
• Modifying pre‑fitted harnesses may lead to loss of product warranty.

Product comments

Evaluation

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