For conducting a Garmin speed cadence sensor reset first of all access main menu then further select settings go to Bike settings from the list that appears select your bike then select ANT +SPD/CAD further press reset button on GPC 10 allow the reset button to flash red and green light then select “yes” under the option “bike censor present” then select rescan after that pedal the bike and check if the red green lights are flashing or not.