SW Install: Firmware does not access all buttons on Steering wheel

[waywardzeek]

I have a AVH-4100NEX head unit installed on a 2012 Kia Sedona LX. I have the Maestro SW installed with standard firmware. I am able to program the Volume -/+ and Mode buttons. However I do not have the ability to program the Phone On/Off Hook and Voice/Siri buttons on my steering wheel. The standard Firmware I am using is SI-ALL01-AS. I tried to do a custom wheel firmware but have no idea how to measure the resistance of buttons.
My question: Is there an alternate firmware out there to use? Just want to have use of all buttons.

Thanks

[JustinFerroni]

If the steering wheel matches the layout f another kia yo may try that. However, it that does not work you are going to need to do a custom firmware. in order to measure the resistance values of each circuit you will need a digital multimeter.
https://www.amazon.com/Digital-Multimet ... B071CY4SF1