Principles of Operation

PRINCIPLES OF OPERATION

NOTE: When installing a new smart junction box (SJB), it must be configured for this feature, if originally equipped. Refer to Information Bus (Module Communications Network).

The daytime running lamps (DRL) are controlled by the SJB. The SJB operates the low beam headlamps at a reduced intensity. The DRL driver (integral to the SJB) supplies pulse-width modulated (PWM) voltage to the low beam headlamps when the following conditions are met:
- The high beam headlamps are not on.
- The ignition switch is in the RUN position.
- The parking brake is not engaged.