Pretty easy. What radar detector do you have first?Has anyone done this, if so, how...
I would recommend these as a start.
This is from an older post of mine:
I do not have an auto dim mirror, so the power at the mirror was battery voltage and not ignition so I went to the fuse panel.
Just adding the pinouts - thanks to @dhpnet
Here is the pinout for the inside rearview mirror harness (A10) on a 2014 Cruze according to the 2014 service manual.
1 - Backup Lamp Supply Voltage (wire color = L-GN/WH) for option DD8
2 - Run/Crank Ignition 1 Voltage (VT/WH) for option DD8
3 - Keypad Signal (L-GN/WH) for option UE1
4 - Keypad Supply Voltage (L-GN/BK) for option UE1
5 - Ground (BK)
6 - Keypad Green LED (YE/VT) for option UE1
7 - Keypad Red LED (BN/WH) for option UE1
8-10 Not Occupied