JLG 1850SJ Operator Manual - Manual (Page 106)

SECTION 5 - LCD DISPLAY PANEL
5-6 – JLG Lift – 3121618
5.4 KEYSWITCH IN GROUND MODE:
If the keyswitch is set to ground mode, the display shows the Key
Switch in Ground Mode Image.
Figure 5-7. Keyswitch In Ground Mode Screen