I've got an 05 5.3 Silverado with the driver side brake, turn signal, reverse and horn not working. At first, these problems were intermittent and now they're here to stay.
I've checked fuses on the driver side door, engine compartment and looked for corrosion at the pig tails underneath by the driver side rear tire as well as a common ground by the driver side radiator support. They could be unrelated but, is there anything else they have in common besides the BCM and that ground?