Town Car V8-4.6L SOHC VIN W (1999)
Tail Lamp: Flow of Diagnosis
1. Verify the customer concern by operating the parking lamps.
2. Visually inspect for obvious signs of mechanical and electrical damage; refer to the following chart:
VISUAL INSPECTION CHART
Mechanical
^
Headlamp switch
Electrical
^
Blown fuse(s)
^
Damaged wiring harness
^
Loose or corroded connection
^
Parking, rear or license bulb(s)
^
Lighting Control Module (LCM)
3. If the inspection reveals obvious concern(s) that can be readily identified, repair as required.
4. 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 menu. If the NGS does not communicate with the vehicle:
^
check that the program card is properly installed.
^
check the connections to the vehicle.
^
check the ignition switch position.
5. If the NGS still does not communicate with the vehicle.
6. Perform the DATA LINK DIAGNOSTIC TEST. If the NGS responds with:
^
CKT914, CKT915 or CKT7O = ALL ECUS NO RESP/NOT EQUIP, refer to Information Bus.
^
NO RESP/NOT EQUIP for lighting control module (LCM), go to Pinpoint Test A. See: Headlamp/Testing and Inspection/Component Tests
and General Diagnostics/With Manual Headlamps/Pinpoint Tests/A No Communication With the Lighting Control Module
^
SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs and perform self-test
diagnostics for the LCM.
7. If the DTCs retrieved are related to the concern, go to the LCM Diagnostic Trouble Code (DTC) Index to continue diagnostics. See: Parking
Lamp/Testing and Inspection/Diagnostic Trouble Code Descriptions/LCM Diagnostic Trouble Code (DTC) Index
8. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics. See: Parking Lamp/Testing and
Inspection/Symptom Related Diagnostic Procedures
