hello, the power for the trailer outputs comes from the total intergrated power module-- this can be reset by doing a battery disconnect--
if problem return that would indicate a short in the trailer side of the wiring,tim
The 2006 DR/DH/D1 is equipped with a Totally Integrated Power Module (TIPM) that provides power feeds for a trailer that are separate from the vehicle lighting feeds. The TIPM uses a dedicated 20A fuse (no electronic control) to power the Park/Position Lamps, and dedicated electronic drivers to power the Left and Right Stop/Turn Signal feeds. On the Stop/Turn outputs, if a load of more than 15 amps is sensed, the TIPM is designed to shut down the circuit and set a Trailer Stop/Turn short circuit fault code (B178C or B166E). This strategy was put in place to protect the vehicle and trailer wiring if a short circuit condition on the trailer occurs.
disconnect the negative post only,tim
after doing this test the outputs of the trailer connector with a test light -- do not hook back up to the trailer until tested
the tipm may have to be reset with the dealers star scan if the battery disconnect does not reset -- it has a stored code in the computer,tim
tipm(totally intergrated power module) is locked up and not delivering the output on that wire