F 150 4WD V8-4.6L VIN 8 (2010)
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Ignition OFF.
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Set the gain on the TBC module to the maximum setting.
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While applying the brake pedal, measure the voltage between the trailer tow connector pin 3, circuit CAT19 (BU), component side and ground.
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Is the voltage greater than 10 volts?
Yes
The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
No
GO to AE4.
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AE4 CHECK FOR VOLTAGE TO THE TRAILER TOW CONNECTOR
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Disconnect: Trailer Tow C439a.
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NOTE: Make sure the gain is still set to the maximum setting.
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While applying the brake pedal, measure the voltage between the trailer tow C439a-3, circuit CAT19 (BU), harness side and ground.
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Is the voltage greater than 10 volts?
Yes
INSTALL a new trailer tow connector. TEST the system for normal operation.
No
GO to AE5.
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AE5 CHECK FOR VOLTAGE TO THE TBC MODULE
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Disconnect: TBC Module C2142.
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Measure the voltage between the TBC module C2142-8, circuit SBB17 (RD), harness side and ground.
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Is the voltage greater than 10 volts?
