F 150 2WD Pickup V8-4.6L CNG SOHC VIN 9 (1997)
Interior Lighting Module: Initial Inspection and Diagnostic Overview
1. The interior lighting system is a Generic Electronic Module (GEM)/Central Timer Module (CTM) controlled system.
2. Verify the customer concerns by operating the interior lamps.
3. Visually inspect for obvious signs of mechanical and electrical damage:
VISUAL INSPECTION CHART
MECHANICAL
^
Switch(es)
ELECTRICAL
^
Fuse(s)
^
Damaged wiring harness
^
Loose or corroded connector(s)
^
Circuitry
^
Damaged bulb(s)
4. If the concern is not visually evident, determine the symptom and proceed to the Symptom Chart. See: Symptom Related Diagnostic Procedures
