WARNING: This page is about a different car, the 2009 Dodge Avenger and 2009 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Locating Diesel Glow Plug Control Module
Courtesy of CHRYSLER LLC
The glow plug control module is mounted to the fuel filter/water separator bracket, and is controlled by the engine control module.