Visual/Physical Inspection

Several of the symptom procedures ask for a careful visual/physical inspection. This step is extremely important. It could lead to correcting a problem without further checks and can save valuable time.

These checks include the following:

• Inspect for aftermarket devices which could affect the operation of the lighting system. Refer to Checking Aftermarket Accessories in Wiring Systems.
• Inspect the easily accessible or visible system components and harness connectors for obvious damage or conditions which could cause the symptom.
• If only one lamp is inoperative, inspect and repair a poor connection or an open in the power feed or ground circuit before replacing the light bulb. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.