Instrument Cluster and Dimmable Backlighting
WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
The generic electronic module (GEM) provides a ground for the park lamp relay when the headlamp switch is in the PARK or ON position. The instrument panel dimmer switch is a momentary contact switch that signals the desired level of brightness sent to the instrument cluster. The park lamp relay and the instrument panel dimmer switch both provide the inputs necessary for the instrument cluster to process and provide the appropriate voltage to the backlight illumination bulbs. The instrument cluster is a hybrid electronic cluster (HEC).