User Manual of Universal Audio Interface. Part of content: You can connect your aftermarket head unit to your original steering wheel eith this universal audio interface. Please notice that the installation for this interface is a professional job, so please go to nearby installation shop for help. Before tearing down the steering wheel, contact the local dealer or the factory first.. For installation with 95% of vehicles, it is very simple and you just need to connect 4 wires.

Interface information, eight wires in the interface:
- White wire: Input/1, Connect this wire to steering wheel audio control system signal output wire SW1 ( For the resistance is larger than 9K, such as car from Korea and USA)
- Green wire: Input/2 Connect this wire to steering wheel audio control system signal output wire SW2 ( For the resistance is less than 9K, such as car from Europe and Japan)
- Blue wire: Input/3 Connect this wire to steering wheel audio control system signal output wire SW3 ( For the resistance is less than 9K, such as car from Europe and Japan)
- Orange wire: Input/4 Connect this wire to steering wheel audio control system signal output wire SW4 ( For +12V input cars, such as Regal. Note: Please don’t connect to the +12V ACC Wire)
- Violet wire: DIN Connect this wire to steering wheel audio control system signal output wire DIN ( For +5V signal output wires, such as VW, Kreisler, and Nissan)