F 150 4WD V8-4.6L VIN 8 (2010)
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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. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal
operation.
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Pinpoint Test E: The Trailer Brakes Are Always Engaged And/Or The Message Center Intermittently
Displays Trailer Disconnected O
Auxiliary Brake System - Trailer Brake Control (TBC) Module
Pinpoint Tests
Pinpoint Test E: The Trailer Brakes are Always Engaged and/or The Message Center Intermittently Displays TRAILER DISCONNECTED or
WIRING FAULT IN TRAILER While Towing a Trailer
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 that switches between 0 volt and battery voltage,
according to the Trailer Brake Control (TBC) module gain setting, the higher the duty cycle the more braking power available. 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 trailer tow C439A-3
circuit CAT19 (BU). The TBC module receives brake pressure information from the ABS module and Brake Pedal Position (BPP) (stoplamp) switch
information from the PCM, both over the High Speed Controller Area Network (HS-CAN) bus.
This pinpoint test is intended to diagnose the following:
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Fuse(s)
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Wiring, terminals or connectors
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TBC module
PINPOINT TEST E: THE TRAILER BRAKES ARE ALWAYS ENGAGED AND/OR THE MESSAGE CENTER INTERMITTENTLY
DISPLAYS TRAILER DISCONNECTED OR WIRING FAULT IN TRAILER WHILE TOWING A TRAILER
NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
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E1 CHECK FOR TBC MODULE DTCs
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Review the DTCs retrieved and recorded during Inspection and Verification.
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Are any TBC module DTCs present?
Yes
GO to the Trailer Brake Control (TBC) Module DTC Chart. See: Diagnostic Trouble Code Descriptions
No
