F 150 4WD V8-4.6L VIN 8 (2010)
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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
GO to C9.
No
GO to C6.
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C6 CHECK THE TBC MODULE PWM OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
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Ignition OFF.
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Disconnect: TBC Module C2142.
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Ignition ON.
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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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Measure the voltage between 7-pin trailer tow connector pin-3, circuit CAT19, (BU), harness side and ground while operating the following lamps
in turn:
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Parking lamps
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Stop lamps
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Reversing lamps
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Is any voltage present?
Yes
REPAIR circuit CAT19 (BU). CLEAR the DTCs. REPEAT the self-test.
No
The system is operating correctly at this time. INSPECT the 7-pin trailer tow connector for evidence of water intrusion or corrosion. INSPECT the trailer
tow harness for evidence of chaffed wiring or improper wire repair. REPAIR wiring as necessary. CLEAR the DTCs. REPEAT the self-test.
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C7 CHECK THE TBC MODULE FOR MAXIMUM OUTPUT
