1999 Lexus SC 400 Owners Manual - Page 52

SWITCHES The automatic light control sensor is on top of the driver's side instrument panel. Do not place anything on the instrument panel, and/or do not affix anything on the windshield to block this sensor. The lights automatically turn off when the driver's door is opened with the ignition key turned to the "ACC" or "LOCK" position. To turn them on again, turn the ignition key to the "ON" position or turn the headlight switch off and then twist the knob until the first or second clickstop. If you are going to park for over one week, make sure the headlight switch is off. When the headlight switch is turned to the first or second clickstop, the brightness of the instrument cluster will be reduced slightly unless the instrument panel light control knob is turned fully on. 34