Circuit/System Description

The head-up display (HUD) dimming switch is a momentary press switch that adjusts the HUD display brightness. The HUD dimming switch controls the intensity of the brightness. The HUD switch dimming input is pulled up to 5 volts in the HUD. The HUD dimming switch is pulled down to ground via a 10K potentiometer. When the HUD dimming switch is pressed and the ignition is in the RUN position, the dimming switch signal to the HUD is low. The HUD senses when the dimming switch is active and adjusts the display brightness until the desired intensity is attained.