Just bought a 2004 XTerra in great shape. But cannot figure out how to set the clock! The "clock" button will 1) show the time 2) flash the hour number and 3) turn off as I push the button successively. When the hour button is flashing, nothing happens when I then push ANY other button on the sound system. I am used to Toyotas but nothing that works on Toys seems to work on the XTerra. Any suggestions?