Normal Operation

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The TBC module receives fused battery power from central junction box (CJB) fuses 101 (30A) and 28 (10A) along circuits 50 (RD) and 298 (VT/OG), respectively. The ground path for the TBC module is along circuit 206 (WH). 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, according to the TBC gain setting, the higher the duty cycle the more braking power available. On vehicles built before March 23rd, 2005 , with the vehicle stationary and with the manual slider switch fully to the left with a gain of 10, there should be greater than 1--2 volts supplied to trailer tow C4099-3, circuit 43 (DB). On vehicles built March 23rd, 2005 and later , 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).