2015 1500 Silverado LT crew cab 5.3 gas engine (late 2015 model no jumper harness required) Chrome tow mirror Manual fold/extend tow mirrors. Harnesses Drivers side 23342729 passenger 23342715. Ok let me try and explain this as to not confuse myself or everyone LOL. Lets start with what works. marker lights turn signals and white LEDs when cargo light is turned on. After I installed the drivers side Mirror I had up down left and right control and all lights worked. moved onto Passengers side. I cant remember if I checked movement after passenger side install or not, the more I think about it the more 'i'm unsure I checked the movement and just assumed it worked. when mirror selector switch is on the drivers side mirror will move left only. when I switch over to the passenger side selector the drivers side will still move only to the left no control to the passenger side mirror. I may of not had these controls on Friday and just noticed it the next day while driving to the store. that's why I'm thinking I need the re-flash I have the correct harnesses from the GM bullatian and it states it will need the BCM flashed for all functions to work properly.