Ford error code B1D09:12
Right trailer direction indicator - circuit short to battery.
What to check, and in what order, is in the app. The flow Lamp-circuit detection - current, thresholds and LEDs walks this code step by step with the pass/fail measurements, wiring schematics and procedures that go with it, and it works offline in the bay.
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- Ford SSM 52279 - 2021-2023 F-150 Trailer Brake System Fault, no trailer connectedFord Motor Company / NHTSA ODI
- Trailer Detection Field Manual Rev. 1.0 + Engineering Supplement Rev. BIn-house (shop technical reference)
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