It's turned on and off via canbus, which is why it is not working as the Vectra is probably giving a different wake up signal than the Meriva.
With cars going CANBUS, they are different to the Astra G, Corsa C era cars.
Not heard of anyone bypassing the illumination and wiring direct to the LEDs as there is no illumination of dimming circuit on the head unit plug, there isn't even an ignition wire, like I said it's all CANBUS.
http://www.diagnostics.org.uk/help/s...adio-Head-Unit
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