Vento beta stereo in mk2 gti

[Munrohuna]

Hi, I have acquired a stereo from a early 90s vw vento from my uncle as my 90 spec gti had no stereo when I bought it. Now all the plugs fit straight in and the led from the vento radio starts flashing but apart from that the stereo is dead!
I have heard that some wiring needs modified in order to fit later stereos to a mk2 . Is this the case even though the vento 'beta' stereo is from roughly the same era?
Any help much appreciated.

[Mr Blue]

You mean the red LED is flashing? This flashes when the key is out/stereo off as a security code warning.

All made by Panasonic (assembled by Matsush!ta) I believe and should not need to add additional wiring. You may just need to wire it in permanently. Putting a permanent feed to the memory (yellow) AND power (red).