You probably need to be in synchro shift mode depending on how many buttons your shifters have (1 on each of the contact points?) - Press the button in the junction twice-quickly until you see the green and red flash 3 times.

When you check the Di2 battery level the LEDs on your junction box will first indicate the battery level (green = battery is 75% to 100% charged), turn off and then illuminate again to indicate the selected synchro-shift mode. The different modes are:

Red and green LEDs turn on for two seconds – manual shift
Red and green blink two times – synchronized shift mode 1
Red and green blink three times – synchronized shift mode 2

source https://di2center.com/...tly-asked-questions/

Thanks this info and the website very helpful. Just a question - what is the difference between synch shift 1 and 2?


Thanks.

It depends on whether or not someone has changed the settings, because you can fully customize modes (and set both 1 and 2 to full-synchro, for example).

The default setting for shift mode 1 is full synchro, meaning that the front derailleur will shift automatically once you reach certain points on the cassette.
Shift mode 2 is semi synchronized shifting - shift the rear derailleurs up/down 1-4 sprockets when you shift the front derailleur.

Note that your bike has to support synchronized shifting (6870 and up, provided you have the BT-DN110 battery or BM-DN100 ext. battery mount).

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Thanks for the info. I am going with full synchro - so easy. My LBS is setting up the left lower buttons to scroll through my Garmin computer which would be cool.