2009 Chrysler 300 Owner Manual - Page 172

170 UNDERSTANDING THE FEATURES OF YOUR VEHICLE NOTE: Installing a vehicle front-end protector or an aftermarket grille or modifying the grille is not recommended. Doing so may block the sensor and inhibit ACC operation. ACC Unavailable Warning If the system turns off, and the EVIC displays ЉACC UNAVAILABLE,Љ there may be a temporary malfunction that limits ACC functionality. Although the vehicle is still drivable under normal conditions, ACC will be temporarily unavailable. If this occurs, try activating ACC again later, following a key cycle. If the problem persists, see your authorized dealer. Service ACC Warning If the system turns off, and the EVIC displays "SERVICE ACC," it indicates there is an internal system fault. Although the vehicle is still drivable under normal conditions, have the system checked by an authorized dealer.