Late 54 reg model L322s had the MOST Touchscreen systems fitted, as long as they were the MY05 models.
Check the fuses for all the units first, CD, TV, Sat Nav, TMC, Nokia Bluetooth Unit and HK Amp. Blown fuse will cause your symptoms.
If fuses ok, then try disconnecting the fibre optic connection from the Nokia unit, remove the cables from the connector and 'join' the two cables together through a short length of Biro tube (i.e. the case of a Bic biro cut down to about 1 inch and insert the ends of the cables into each end of the case till they touch). There's a vid on youtube demonstrating the method.
If not the Nokia unit knackered (which is the most common cause of the fault0 then you may have to repeat the process with the other units connected through the fibre optic ring.