Normal Operation

When the headlamp switch is turned to the ON position, the SJB monitors input from the instrument panel dimmer switch through circuits 2085 (VT/YE and 1403 (BK/WH). The instrument panel dimmer switch outputs a pulse width modulation (PWM) voltage to the SJB, on circuit 1405 (LB/BK). The instrument panel dimmer switch internal circuitry is grounded through the SJB by circuit 1205 (BK).