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 dont 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)