F 350 2WD Super Duty V10-6.8L (2009)
10. If the DTCs retrieved are related to the concern, refer to Diagnostic Trouble Code (DTC) Chart See: Testing and Inspection. For all other DTCs,
refer to the Diagnostic Trouble Code (DTC) Chart in Body Control Systems. See: Body and Frame/Body Control Systems/Testing and
Inspection/Diagnostic Trouble Code Descriptions/Diagnostic Trouble Code (DTC) Chart
11. If no DTCs related to the concern are retrieved, GO to Symptom Chart. See: Symptom Related Diagnostic Procedures
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
-
Transmission gear selection (automatic transmission)
-
Parking brake applied or released (manual transmission)
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.
The SJB can be configured to turn the DRL on for this vehicle. Refer to Information Bus for programmable parameter information.
