I’ve been looking at changing some of the steering wheel controls into cruise control buttons this week. This might be easier becuase the SZL handles both the steering wheel buttons and the cruise stalk.
The DTC switch is operated through the JBF and the steering wheel controls; SZL. However they are both on the K-CAN so should be possible right?
Basically you need to sniff the CAN for the message that is sent when you press your desired steering wheel button. Then sniff the CAN for the message when the DTC button is pressed.
Then you need an electronic controller (Aurdrino with CAN receiver and transmitter) with some code on it that will send the DTC burton press CAN code when it sees the CAN code for the steering wheel button press.
This is a good read through on how it’s possible to manipulate the CAN bus communication of the buttons:
https://tbruno25.medium.com/car-hack...d-783d7e0a2046