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The on / off button is an encoder like on the earlier X300 Jaguar / Alpine AJ9500A control head and that sometimes can be replaced
there are 2 different versions of the control head between the years of X308 production
the early years are more like the x300 version
Your year may be the crossover point
On the VDP you probably have the premium setup using the round cable ( problem area ) from the head to feed an amplifier in the trunk with it's own fuse
You can feel for the amplifier getting warm by feeling it as it has a form of internal protection leaving the fuse not blown
Do you get any display of tuning frequency in the head ?
Folks, thanks for all your responses. The issue is fixed. Just by pressing down the fuses and relays in the truck fuse box. Seems some fuses were loose.