The automatic day-night mirror uses two photocell sensors in order to determine light conditions in the front and the back of the vehicle. At night, as the glare of the headlamps from behind increases, the mirror gradually becomes darker in order to absorb the glare. In the daytime, the mirror is in a clear state.

With the ignition switch in the ON position, battery positive voltage is applied to the automatic day/night mirror connector cavity. When the automatic day/night mirror switch is placed in the ON position, battery positive voltage is applied to the automatic day/night mirror circuit. Battery positive voltage is supplied at all times to the backup lamp relay coil through the DIC/RKE Fuse through the right side IP wiring junction block. Battery positive voltage is supplied at all times to the backup lamp relay switch through the BU LAMP Fuse through the right side IP wiring junction block. The coil is energized, closing the switch contacts. This supplies battery positive voltage to the automatic day/night mirror. The mirror will gradually change to a clear state as a result of the reverse input.