Hello I have a TomTom Multi-Sport Cardio with Cadence/Speed Sensor since December last year, but just decided to install de cadence sensor this weekend. Unfotunately it did not work. I did everything recomended on the manual and on the TomTom Youtube chanel. But no communication could be stablished. The sensor is set to "on" on the watch I also checked the battery and it is ok. Any suggestions?