Test D: DTCS C2806, C2807 and C2808 - Trailer Brakes Circuit Failure
PINPOINT TEST D: DTCs C2806, C2807 AND C2808 - TRAILER BRAKES CIRCUIT FAILURENormal Operation
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).
Possible Causes
^ Fuse(s)
^ Circuit open
^ Circuit shorted
^ Corrosion
^ Pushed-out pins
^ Trailer brake control (TBC) module
^ Customer trailer
D1-D3:
D3-D4:
D5-D7:
D7-D8:
