E 450 V8-5.4L (2009)
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Y1 CHECK THE TRAILER ELECTRIC BRAKE CONTROLLER FOR A SHORTED OUTPUT
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Ignition ON.
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Measure the voltage between the trailer tow connector electric brake control supply pin, circuit CAT19 (BU), component side and ground.
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Is any voltage present?
Yes
GO to Y2.
No
GO to Y3.
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Y2 CHECK CIRCUIT CAT19 (BU) FOR A SHORT TO VOLTAGE
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Disconnect: Trailer Electric Brake Controller C2142.
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Measure the voltage between the trailer tow connector electric brake control supply pin, circuit CAT19 (BU), component side and ground.
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Is any voltage present?
Yes
REPAIR circuit CAT19 (BU) for a short to voltage. TEST the system for normal operation.
No
INSTALL a new trailer electric brake controller. TEST the system for normal operation.
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Y3 CHECK THE TRAILER ELECTRIC BRAKE CONTROLLER OUTPUT
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Set the gain on the trailer electric brake controller to the maximum setting.
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While applying the brake pedal, measure the voltage between the trailer tow connector electric brake control supply pin, circuit CAT19 (BU),
component side and ground.
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Is the voltage greater than 10 volts?
