Description
Full Factory Feature Retention When You Upgrade Your Subaru's Head Unit
Product Overview
The Aerpro ASSU9C is a CAN bus steering wheel control (SWC) interface engineered for a range of Subaru vehicles. It allows you to install an aftermarket head unit while retaining your factory steering wheel controls, Harman Kardon amplified sound system, reverse camera (including front and side cameras where fitted), factory antenna, and AUX input all without cutting the factory wiring harness.
The ASSU9C connects via a vehicle-specific plug that drops straight into the existing wiring, and the kit includes an antenna adaptor, reverse/front/side camera retention adaptors, and AUX retention leads. It provides reverse trigger (purple) and park brake (green) output feeds for compatible head units. Illumination output is also included. For a complete installation, Aerpro recommends pairing the ASSU9C with the APP8 Head Unit Secondary ISO Harness, sold separately.
Features & Benefits
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Retains factory steering wheel controls — upgrade your head unit without losing steering wheel audio functions
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Retains factory Harman Kardon amplifier — keeps the factory amp in the signal chain where equipped; note: fade control is not supported
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Retains factory reverse camera — including front and side cameras where originally fitted; aftermarket head unit requires RCA reverse camera input
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Retains factory antenna — includes antenna adaptor converting the factory plug to a universal DIN plug for aftermarket radios
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Retains factory AUX input — where originally fitted; aftermarket head unit requires rear RCA for AUX input
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Reverse trigger output — provides reverse trigger feed (purple wire) for compatible head units
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Park brake output — provides park brake feed (green wire) for compatible head units
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Illumination output — retains factory illumination feed
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CAN bus interface — communicates directly with the vehicle's CAN bus network; patch lead type H
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Vehicle-specific plug — direct plug-in connection; no cutting or splicing of factory wiring required
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Retention hardware included — antenna adaptor, camera retention adaptors, and AUX retention leads all in the kit
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Pairs with APP8 harness — install alongside the Aerpro APP8 Head Unit Secondary ISO Harness for a simplified full installation (sold separately)
Technical Specs
| Specification |
Detail |
| Part Number |
ASSU9C |
| Brand |
Aerpro |
| Interface Type |
CAN Bus |
| Patch Lead Type |
H |
| Vehicle Fit |
Various Subaru (see Aerpro Vehicle Selector) |
| Reverse Trigger Output |
Yes (purple wire) |
| Park Brake Output |
Yes (green wire) |
| Speed Pulse Output |
No |
| Illumination Output |
Yes |
| Amp Remote Output |
No |
| Telephone Mute Output |
No |
| Vehicle Menus Retention |
No |
| OEM Amplifier Retention |
Yes (Harman Kardon; fade not supported) |
| OEM Reverse Camera Retention |
Yes (including front & side cameras) |
| OEM AUX Input Retention |
Yes |
| OEM USB Input Retention |
No |
| OEM Antenna Retention |
Yes |
| Included Accessories |
Antenna adaptor, camera retention adaptors, AUX retention leads |
| Recommended Accessory |
Aerpro APP8 (sold separately) |
Compatible With
Engineered for various Subaru vehicles — use the Aerpro Vehicle Selector to confirm your specific model and year before purchasing. Key compatibility requirements for the aftermarket head unit:
- Must be SWC compatible
- Requires RCA reverse camera input to retain factory reverse/front/side cameras
- Requires rear RCA input to retain factory AUX
Steering wheel control functions may vary from the original OEM functions depending on the head unit installed.
Weight
Confirm with supplier.
Frequently Asked Questions
Which Subaru models does the ASSU9C fit?
The ASSU9C suits various Subaru models. Use the Aerpro Vehicle Selector to confirm compatibility with your specific vehicle make, model, and year before purchasing, as fitment varies between variants.
Does this retain the factory Harman Kardon sound system?
Yes, the factory Harman Kardon amplifier is retained. However, fade control (front-to-rear audio balance) is not supported through this interface.
Will my factory reverse camera still work after installation?
Yes, provided the camera was originally fitted. The ASSU9C retains the factory reverse camera including front and side cameras where equipped. The aftermarket head unit must have an RCA reverse camera input to utilise this feature.
Do I need to cut any factory wiring?
No. The ASSU9C uses a vehicle-specific plug that connects directly into the existing factory wiring harness without cutting or splicing.
What is the APP8 harness and do I need it?
The Aerpro APP8 is a head unit secondary ISO harness that connects between the aftermarket head unit and the ASSU9C interface, simplifying the overall installation. It is sold separately and while not mandatory, Aerpro recommends it for a cleaner, more straightforward install.
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