Hyundai CANBus audio control

The primary purpose of this project is to add volume control using a Raspberry Pi, a HiFiBerry Digi+ i/o board, and a CAN hat to a 2015 Hyundai Genesis 5.0 with 14 speaker Lexicon sytem.

The 2015 Hyundai Genesis with the 14 speaker Lexicon audios system uses S/PDIF to transmit audio digitally to the OEM amplifier in the rear trunk of the car, however it is a fixed volume signal. The amplifier in the rear of the car receives signals from the CAN BUS interface to set the volume level, mute, and car on/off status. In order to replace the OEM amplifier with more powerful, better sounding amplifiers the digital signal must be volume controlled prior to being sent to a DSP and/or amplifiers.

The following equipment is needed at minimum to interface with the OEM S/PDIF and CAN BUS interface:

• Raspberry Pi 4 2GB
• CAN HAT
• Fault Tolerant CAN converter
• HiFiBerry Digi+ I/O
• 12V delay relay
• 12V to 5V power supply

The following is an example diagram of how to connect the necessary components:

Raspberry Pi Setup information can be found in the Installation Guide