Component Tests and General Diagnostics

Inspection and Verification

1. Verify the customer concern by operating the trailer tow lights.

Visual Inspection Chart:

2. Verify the exterior lighting system of the vehicle is operating correctly. If not, refer to the appropriate pinpoint test in this section.
3. Visually inspect for obvious signs of electrical damage.
4. If the fault is not visually evident, determine the symptom and proceed to SYMPTOM TROUBLESHOOTING CHART - TRAILER LAMPS. Symptom Related Diagnostic Procedures