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You didn't say where you're from - Euro model car or North America model? On the NA model, its to the left of the steering wheel, just above the lever that releases the charge port door. The switch has a logo with a car and the squiggly lines and say 'OFF' on it
2012 iMiEV SE Premium, White
2012 iMiEV SE Premium, Raspberry Metallic
2012 iMiEV SE, White
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2006 Itasca Navion Sprinter Motor Home