Tried the CAN - AMP switch over via the Volume advanced menu. No joy. Actually switching to AMP causes AM signal and the illumination on the buttons on the head unit to cut off.
I also have what seems to be be a weird issue. When the car is stationery everything is fine but when in motion DAB / FM / AM all seem to struggle keeping a consistent signal and the output sound fades in and out.
It doesn’t seem to be related with the location / driving path. Rest of the functionality of the pccm plus unit seems to be operational as expected. Recently acquired 996 2004 with BOSE (CD Changer and AMP in front trunk)
Any suggestions/checks ? Read a thread about the wrong connections and loop back in the antenna piece etc.
Wanted to see if anyone else has experienced a similar issue before I start dismantling things…
Thanks