WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Antilock Brake Module
Courtesy of DAIMLERCHRYSLER CORP.
1 - ABM
2 - HCU
The G-sensor is located inside the ABM (Antilock Brake Module) (1). The sensor is not a separate serviceable part from the ABM (1).