Control button unit, OnStar
The OnStar control button unit is positioned on the instrument panel to the right of the steering wheel and has three buttons and an indicator lamp. The indicator lamp shows a green or a red light depending on the status of the system. The 6 pin connector of the control button unit is connected, via the car wiring harness, to the 16 pin connector on the VCIM (Vehicle Communication Interface Module) of the OnStar control module.