Principles of Operation

Daytime Running Lamps (DRL)


Principles of Operation

NOTE: The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).

NOTE: The Daytime Running Lamps (DRL) is not a programmable parameter for this vehicle.

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

For vehicles with halogen headlamps, when the DRL is active, the SJB provides a pulse-width modulated voltage to the low beam headlamps. This illuminates the headlamps at a reduced intensity.

For vehicles with High Intensity Discharge (HID) headlamps, the SJB activates the fog lamp relay. This illuminates the fog lamps at full intensity.