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: When installing a new SJB, it must be configured for this feature, if originally equipped. Refer to Information Bus.

The SJB controls the Daytime Running Lamps (DRL) by using various inputs to determine whether or not the DRL should be illuminated. These inputs include:

- Ignition switch position
- Headlamp switch position
- 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.

For Taurus and Taurus X, the SJB can be configured to turn the DRL on. Refer to Information Bus for programmable parameter information.

For Sable, the DRL is not a programmable parameter.