Loren Lyons

I have a 2021 GMC 1500 and the rear bumper has sensors into it with looks like relays on each side of the bumper. When I am in reverse I have the indicator telling me how close I am to anything in back of me but no alarm. I went into the dealer and was told my truck did not come with back up alarm even it has sensors and relays in rear bumper. can I somehow hook these sensors up so my back up alarm works?

Anybody taking out bose speakers and amp from a 2020 GMC 1500? Looking to buy Bose speakers and amp!! [email protected] . Send me a message ;tell me what you got.