Texanforlife

I just came to the dealership after installing these mirrors and harnesses only to find out they cannot flash it to work. Truck originally had blind spot monitors, so they say that’s why it will not work. Turn signals and power mirror portion works so I may just deal with check engine light. Don’t really care about spot lamps not working but the remote start stopped working so that may be a deal breaker for me. 2021 Sierra Elevation 3.0