Here we go....again......
The BCM runs the trailer turn/brake lights left & right. IF your truck has had the TSB completed there will be a sub harness located right next to the BCM(above the brake pedal area)that contains fuses for the left/right signals(trailer only, not the truck itself)those fuses need to be checked.
If both fuses are good, then you need to check each one for power when hitting the brakes. If there's no power to one of them then either theres a wiring issue(sub harness wire or sub pin bad) or the BCM is bad.
If you truck does NOT have the sub harness, you will need to check the 2 wires coming out of it for power like above.
This is only after double checking you have no lights at the 7 pin connector
You had all the lights at one time, so there's no missing relay.....AND relays rarely go bad compared to fuses...
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Titan KC SE 2wd StreetFighter...(Step away from the Titan)
PRG Performance Kit w/SAW's
including rear SAW 2.25" Piggys
Nitto Terra Gobblers on Pro Comp 1028 Wana-be Bead lock wheels
3.73 Gears and TruTrac for Gription
Born 9/2004
I replaced the factory air in my tires with a Citrus scented air package...
Oh yeh....I replaced the screw that holds on the mirror with a trick black oxide one that nobody will see or care about...
2002 Honda XR650R