Suzuki has some cars with "S-ene-charge" that is electric motor assist . us ko hybrid keh saktay hain . this is ene charge . matlab jab car decelerate ho rahi ho gi to it will charge the batteries.
so 1st thing is that your stingray is not "hybrid" matlab ke electricity base pe engine na hi chalta hai na hi koi assist hai .
2ndly , why display is not working .. do you wear seat belt ? driver seat belt is required for idle stop to work . agar seat belt pehente hain aur phir bhi idle stop feature nhi chal raha to there is a problem . get it computer scanned and check what the error is.