JayGee wrote:

Swopped out the ECU but system still dead - any fault tracing diagnostic procedure out there or even a circuit diagram?

The plugs on the ECU? 2012 TDV8 Vogue (L322)

Correct. On mine the power/CANbus plug was fine, it was the sensor one that was affected.

Pulled the plugs apart and all the connectors look clean and corrosion free so looks like the wiring to the sensors under the bumpers to check next although increasingly not too bothered by a non working parking assist. 2012 TDV8 Vogue (L322)

Did you ever figure out the problem. My switch does nothing and I have already replaced the module with a used one. My module was bad and there was corrosion on the connector. I cleaned the connector metered the pins to make sure they were still good and replaced the module and still no joy.