The radio should reboot instantly. The display will flash, the CD mechanism may whir, and then it should return to normal operation (e.g., showing a radio station frequency). If this works, your problem is solved.
If you are staring at a blank screen, a blinking red LED, or the dreaded "SAFE" message, you do not need to rush to a dealership. In most cases, a simple reset can bring your RCD 300 back to life. How To Reset Vw Volkswagen Rcd 300 Radio
If you don't have the code at all:
If you own a Volkswagen from the mid-2000s era—such as a Golf MK5, a Jetta, a Passat B6, or a Touran—chances are you are familiar with the RCD 300 radio unit. It was the standard double-DIN audio system known for its decent sound quality and simple, utilitarian design. The radio should reboot instantly
