E 450 V8-5.4L (2009)
If no DTCs returned, the TBC module and vehicle wiring are operating correctly. SEND the trailer to an authorized camper/trailer repair center.
CLEAR the DTCs. REPEAT the self-test.
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C4 CHECK THE TBC MODULE PWM OUTPUT CIRCUIT FOR A SHORT TO GROUND
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Ignition OFF.
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Disconnect: TBC Module C2142.
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Measure the resistance between 7-pin trailer tow connector pin-3, circuit CAT19 (BU), harness side and ground.
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Is the resistance greater than 10,000 ohms?
Yes
GO to C7.
No
REPAIR circuit CAT19 (BU). CLEAR the DTCs. REPEAT the self-test.
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C5 CHECK THE TBC MODULE OUTPUT
NOTE: Every 4 seconds a voltage pulse is applied as a trailer connectivity test.
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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 0.3-0.5 volt?
Yes
GO to C7.
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
