Principles of Operation

PRINCIPLES OF OPERATION

NOTE: The DRL option is not available on vehicles with high intensity discharge (HID) headlamps.

The smart junction box (SJB) controls the DRL by using various inputs to determine whether or not the DRL should be illuminated. These inputs include:
- Ignition switch position
- Parking brake switch input
- Headlamps on or off
- Transaxle gear selection

When the DRL is active, the SJB provides a pulse-width modulated (PWM) voltage to the low beam headlamps. This illuminates the headlamps at a reduced intensity.