I found that I could enable Pandora functionality in my CRV. I got into the service a menu and switched Pandora on. Now, when I plug my iPhone into the USB port, I can select the source Pandora. From my I-Mid I can chose channels, like or unlike tracks, etc. Nice to enable an undocumented function.

To access the service menu:
1. Press the MENU button on the steering wheel
2. Press and hold the MENU and SOURCE buttons on the steering wheels for around 5 secs
3. The Service Menu will appear
4. Scroll down to Pandora, select it and choose to switch it ON
5. Press MENU button to exit the service menu.

Please note this source will only work if you use the USB cable and that Pandora needs to be running on your smart phone.