See: 
https://thinkpad-forum.de/threads/212013-EM7345-LTE-GPS-aktivieren-unter-Windows10
(German)
https://zukota.com/how-to-enable-at-command-and-diagnostic-ports-and-gps-for-sierra-wireless-em7345/
(english)

Lenovo divers:
https://support.lenovo.com/us/en/downloads/ds040771
Supported ThinkPad Systems

    ThinkPad L440, L540, L450
    ThinkPad T431s, T440, T440p, T440s, T450, T450s, T540p, T550
    ThinkPad W540, W550s
    ThinkPad X1 Carbon (Machine types: 20A7, 20A8, 20BS, 20BT)
    ThinkPad X240, X250
    ThinkPad Yoga 15

https://download.lenovo.com/pccbbs/mobiles/nz0wo01w.exe
https://download.lenovo.com/pccbbs/mobiles/nz0wo01w.txt