Your install looks great. I am in the process of installing the lighted cupholders in an sel that never had ambient lighting. Below is the process as I understand it. Is there anything I am missing?
1. run wire from pin 13 on the c2280g haness in the bcm to cupholder
2. tap power and ground from somewhere
3. Change 7D0-01-02 xxx-xxx-2xxx using forscan (I did this and it did not put the ambient lights control on the sync screen, do I have to install the cupholders first before I make that change? Is there also changes that need to be made in the body control module using sync?
Where did you get power and ground from for the cupholders? Did you make a harness or just wire tap? Did you find a harness to plug into the cupholder or just cut off the factor harness that comes on the cupholder and tie wires together?
Thanks in advance for any guidance you can provide.