F 150 4WD Pickup V8-5.4L SOHC VIN 3 (1999)
Headlamp Dimmer Switch: Initial Inspection and Diagnostic Overview
1. Verify the customer concern by operating the multifunction switch or ignition switch.
2. Visually inspect for obvious signs of mechanical and electrical damage.
3. If the concern remains after the inspection, connect the New Generation STAR (NGS) Tester to the Data Link Connector (DLC) located beneath
the instrument panel and select the vehicle to be tested from the NGS tester menu. If NGS Tester does not communicate with the vehicle:
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check that the program card is correctly installed.
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check the connections to the vehicle.
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check the ignition switch position.
4. If NGS Tester still does not communicate with the vehicle, refer to the New Generation STAR Tester manual.
5. Carry out the DATA LINK DIAGNOSTIC TEST. If the NGS responds with:
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CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, Diagnose the Module Communications Network.
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NO RESP/NOT EQUIP for Generic Electronic Module (GEM) or Central Timer Module (CTM), go to Pinpoint Test A. See: Pinpoint
Tests/Test A: No Communication With the GEM or CTM
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SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs and carry out self-test
diagnostics for the GEM/CTM.
6. If the DTCs retrieved are related to the concern, go to the GEM/CTM Diagnostic Trouble Code (DTC) Index to continue diagnostics. See:
Diagnostic Trouble Code Descriptions/GEM/CTM Diagnostic Trouble Code (DTC) Index
7. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics. See: Symptom Related Diagnostic Procedures
