bare with me on this , straigh out of the manual.
: The light will illuminate when the ignitions is turned ON and turn off when the engine is started.
: The light will illuminate if there is an abnormality in the Atessa E-TS sytem.
: There are occasions when the front tyres is large.
Warning
: when the 4WD warning light shows or will not illuminate when the ignition is in the ON postition, have your vehicle checked by your Nissan Dealer ASAP.
: If thewarning light flashes check that all tyres are the same size and brand. (only use tyres that are the same size and brand). check pressure and put air in if pressure is low. If the light continues to flash, have you car checking by your Nissan Dealer.
Advice
: If the light turns on when driving, the Attesa E-TS system will cease functioning but normal driving will be possible.
: A 'motor' noise might be heard when starting the engine or while driving. If the noise stops straight away this is not an abnormality
Hope this helps Tim. safe driving