Aux cable help!
 

Hi, I have a 54 plate Copper with radio model RCD108-01. The back has a 12 pin socket which is supposed to be for a AUX cable? I bought the cable off the internet, connected it but the radio doesnt give me the AUX option when I press the mode button. I've tried with ignition on, phone plugged in to AUX outlet and phone not on charge but still no luck. Can anyone help?

Thanks
Emma