F 150 4WD V8-4.6L VIN 8 (2010)
GO to E2.
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E2 CHECK THE TBC BRAKE ON/OFF (BOO_TBC) PID
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Connect the scan tool.
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Ignition OFF.
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Enter the following diagnostic mode on the scan tool: DataLogger - TBC Module.
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Monitor the BOO_TBC PID while pressing and releasing the brake pedal.
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Does the PID agree with the brake pedal position?
Yes
GO to E4.
No
GO to E3.
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E3 CHECK THE PCM BOO PID
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Enter the following diagnostic mode on the scan tool: DataLogger - PCM.
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Monitor the BOO1 and BOO2 PIDs while pressing and releasing the brake pedal.
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Do the PIDs agree with the brake pedal position?
Yes
REFER to Information Bus to diagnose the HS-CAN bus.
No
REFER to Lighting and Horns to diagnose the stoplamp (BPP) switch.
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E4 CHECK THE TBC MODULE OUTPUT
NOTE: Every 4 seconds a voltage pulse is applied as a trailer connectivity test.
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Ignition ON.
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Make sure the brake pedal is not pressed and the manual slider switch is not being applied.
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Measure the voltage between 7-pin trailer tow connector pin-3, circuit CAT19 (BU), harness side and ground.
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Is the voltage approximately 0.3-0.4 volt?
Yes
The TBC module and vehicle wiring are operating correctly. SEND the trailer to an authorized camper/trailer repair center.
