Radiator Shutter: Description and Operation: Overview

Active Grille Shutter System

Overview

The grille shutter system (when equipped) is comprised of the grille shutter assembly and the grille shutter actuator. The grille shutter system is primarily used to maximize fuel economy by reducing aerodynamic drag on the vehicle. In addition, the system is used to control coolant temperature, HVAC (Heating, Ventilation, and Air Conditioning) system performance and exhaust emissions depending on the vehicle speed. The grille shutter system is also used to shorten engine warm-up time, increasing engine efficiency and providing heat to the vehicle occupants in a timely manner. The grille shutter actuator receives position commands from the PCM (Powertrain Control Module). The grille shutter system carries out a calibration sequence whenever the engine is started, fully opening and closing the shutters before being positioned in the programmed position as requested by the PCM (Powertrain Control Module).

PCM (Powertrain Control Module) inputs/outputs used for controlling of grille shutters are the:
- ECT (Engine Coolant Temperature) sensor
- IAT (Intake Air Temperature) sensor
- A/C (Air Conditioning) pressure transducer
- APP (Accelerator Pedal Position) sensor
- ABS (Anti-Lock Brake System) module (through the HS-CAN (High Speed Controller Area Network))
- Engine cooling fan motor
- Engine oil temperature