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HOMESERVICE MANUALSFORD2021EDGE SE, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 236 (AUXILIARY BRAKE SYSTEM)DIAGNOSIS AND TESTINGAUXILIARY BRAKE SYSTEM - VEHICLES WITH: TRAILER BRAKE CONTROLPINPOINT TESTSPINPOINT TEST G : U3003:16NOTES
2021 Ford Edge SE, 4WD

Pinpoint Test G : U3003:16: Notes

2021 Ford Edge SE, 4WDSECTION Notes
WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

U3003:16 

Refer to Trailer/Camper Adapter for schematic and connector information.

Normal Operations and Fault Conditions 

The TBM requires an operating voltage between 9 and 16 volts. The TBM receives this voltage from the BJB. The TBM has a single ground circuit. Excessive resistance or an open in one or more of these circuits, a discharged battery or a inoperative charging system results in the TBM setting a DTC. If the voltage drops below 8 volts the TBM disables the trailer brake output and shuts down.

DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
U3003:16 Battery Voltage: Circuit Voltage Below Threshold This DTC sets in continuous memory and on-demand if the voltage supplied to the TBM is less than 9 volts for longer than 5 minutes while not braking.

Possible Sources 

  • Fuses
  • Wiring, terminals or connectors
  • Charging system concern
  • Battery
  • TBM

Visual Inspection and Diagnostic Pre-checks 

  • Make sure the vehicle battery terminals and cables are free of any corrosion and other contaminants.
  • Make sure the vehicle battery terminals are tightened to their correct torque specifications.
  • Make sure BJB fuse 8 (40A) is OK.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.