make sure you have power on the red and yellow pins at the radio harness9use a test light). if not there is a power/fuse problem, also make sure ground is correct, ansome cars need antenna plugged in for radio to work.
Hi The car i am installing it into is an older car there is power on when ignition is on and also a constant power wire. I earthed the unit by running a fly lead from the battery. Still no luck. Checked the fuses etc.