Symptom Chart
WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .
Symptom Chart
| Condition | Possible Sources | Actions |
|---|---|---|
| A module does not respond to the diagnostic scan tool | Fuse Wiring, terminals or connectors Module |
REFER to: Communications Network (418-00 Module Communications Network). |
| All the trailer lamps are inoperative | Refer to the Pinpoint Test | GO to Pinpoint Test A |
| One or more trailer stop/turn lamps are inoperative or always on - vehicles not equipped with a TRM | Refer to the Pinpoint Test | GO to Pinpoint Test B |
| One or more trailer stop/turn lamps are inoperative or always on - vehicles equipped with a TRM | Refer to the Pinpoint Test | GO to Pinpoint Test C |
| The trailer parking lamps are inoperative or always on | Refer to the Pinpoint Test | GO to Pinpoint Test D |
| The trailer reversing lamps are inoperative or always on | Refer to the Pinpoint Test | GO to Pinpoint Test E |
| The trailer battery charging is inoperative/does not operate correctly | Refer to the Pinpoint Test | GO to Pinpoint Test F |