Cigarette Lighter: Description and Operation

CIRCUIT DESCRIPTION

Digital clock
Battery voltage is applied at all times to the digital clock from fuse 25 to provide clock memory. With the ignition switch in ACC or ON, battery voltage is applied to the clock through fuse 9. The digital clock light up and displays the time. With the light switch in PARK or HEAD, the light switch provides ground to the digital clock and the digital clock's display will dim.

Cigarette lighter
With the ignition switch ACC or ON, battery voltage is applied from fuse 18 to the cigarette lighter. When you depress (push) the lighter, the lighter element completes the circuit to ground. When the element becomes sufficiently heated, it is spring-released and the circuit opens.