Vacuum Fluorescent (VF) Dimming

The brightness of the Vacuum Fluorescent (VF) Displays is controlled by two signals: the VF Dim Displays Signal (CKT 308) and the VF Dimming Signal (CKT 230). With the Park Lights "ON" (VF Dim displays CKT 308) the VF display of the Radio and the Trip Computer will dim for nighttime viewing. When the VF Dim Displays Signal is not present (Park Lights "OFF"), the VF displays are at HI brightness for daytime viewing. When the Park Lights are "ON," the Headlight Switch provides a Pulse Width Modulated (PWM) signal (VF Dimming Signal CKT 230) which controls the brightness of the VF displays when the I/P Dimmer Switch is adjusted.