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Home >> Ford >> 2006 >> Focus ZX5 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 849 (Auxiliary Brake System) >> Diagnostic Tests >> Auxiliary Brake System - Trailer Brake Control (TBC) Module >> Pinpoint Tests >> Pinpoint Test D: DTCs C2806, C2807 and C2808 - Trailer Brakes Circuit Failure >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The braking energy that is provided to the trailer is varied with a pulse width modulated (PWM) signal that switches between 0 volt and battery voltage, the higher the duty cycle the more braking power available. With the vehicle stationary and with the manual slider switch fully to the left with a gain of 10, there should be greater than 10-12 volts supplied to trailer tow C4099-3 circuit 43 (DB).

Every 4 seconds the TBC module sends a voltage pulse along circuit 43 (DB) to trailer tow C4099-3 to determine whether or not a trailer is connected to the trailer tow connector. If the TBC module receives a returning voltage, a trailer is connected. If the TBC does not receive a returning voltage, a trailer is not connected.

Possible Causes

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