Escape 2WD V6-3.0L (2009)
Daytime Running Lamp: Initial Inspection and Diagnostic Overview
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:
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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 additional information on this programmable parameter.
Special Tools Used With Diagnostics
Daytime Running Lamps (DRL)
Inspection And Verification
Daytime Running Lamps (DRL)
Inspection and Verification
1. Verify the customer concern.
2. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
3. NOTE: Make sure to use the latest scan tool software release.
If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
4. NOTE: The Vehicle Communication Module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.
If the scan tool does not communicate with the VCM:
-
Check the VCM connection to the vehicle.
-
Check the scan tool connection to the VCM.
-
Refer to Information Bus, No Power To The Scan Tool, to diagnose no power to the scan tool.
5. If the scan tool does not communicate with the vehicle:
