Grand Marquis V8-4.6L Flex Fuel (2010)
Daytime Running Lamp: Initial Inspection and Diagnostic Overview
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:
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Check the VCM connection to the vehicle.
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Check the scan tool connection to the VCM.
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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:
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Verify the ignition key is in the ON position.
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Verify the scan tool operation with a known good vehicle.
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Refer to Information Bus to diagnose no response from the PCM.
6. Carry out the network test.
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If the scan tool responds with no communication for one or more modules, refer to Information Bus.
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If the network test passes, retrieve and record the continuous memory DTCs.
7. 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
8. Check the Lighting Control Module (LCM) and make sure the Daytime Running Lamps (DRL) configuration is enabled.
9. 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
