F 150 4WD V8-4.6L VIN 8 (2010)
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Is the resistance less than 5 ohms?
Yes
GO to B6.
No
REPAIR circuit GD138 (BK/WH). CLEAR the DTCs. REPEAT the self-test.
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B6 CHECK FOR CORRECT TBC MODULE OPERATION
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Check the TBC module connector for:
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corrosion.
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pushed-out pins.
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spread terminals.
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Connect: TBC Module C2142.
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Make sure the connector is seated correctly, then operate the system and verify the concern is still present.
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Is the concern still present?
Yes
INSTALL a new TBC module. CLEAR the DTCs. REPEAT the self-test.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the
self-test.
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Pinpoint Test C: The Message Center Displays Trailer Fault
Auxiliary Brake System - Trailer Brake Control (TBC) Module
Pinpoint Tests
Pinpoint Test C: The Message Center Displays TRAILER FAULT
NOTE: Carry out all pinpoint tests without a trailer connected to the vehicle.
Refer to Wiring Diagram Set 95, Trailer/Camper Adapter for schematic and connector information. See: Diagrams/Electrical Diagrams/Diagrams By
Number
Normal Operation
The braking energy that is provided to the trailer is varied with a Pulse Width Modulated (PWM) signal along circuit CAT19 (BU) that switches between
0 volt and battery voltage, the higher the duty cycle the more braking power available. The Trailer Brake Control (TBC) module varies the PWM signal
based on various inputs such as the brake pressure transducer, the manual slider switch and the gain buttons. With the vehicle stationary and with the
manual slider switch fully to the left with a gain of 10, there should be greater than 10-12 volts supplied to pin 3 of trailer tow connector C439A along
circuit CAT19 (BU).
