[Loss of right side steering wheel controls]

2018 RAV4. I replaced the radio head unit with an aftermarket radio. Now my right side steering wheel controls aren’t functioning. Is there any wiring from the right side buttons that would be affected by changing out the head unit? I understand the loss of the left side controls, but not the right side. Any ideas?  Thanks. 

[Loss of all steering wheel controls]

Has anyone successfully added an aftermarket head unit and ALL steering wheel controls work?

2018 RAV4 added Sony head unit. Did NOT add steering wheel controls as I never use them. But now NONE of the steering wheel controls work, including the multi information display controls. 
 

if you have replaced the OEM head and was able to keep all controls working, what add ons did you use?

 

Thanks