This mode is used to access deeper system addresses and specific Diagnostic Trouble Codes (DTCs) stored in the tractor's control units. When "diA" is active, the display acts as a portal for you or a technician to pinpoint electrical or mechanical issues within the machine. What "diA" Means on Your Display
: Look for pinched, frayed, or broken yellow/green twisted wires (the standard John Deere CAN bus colors) throughout the chassis. Low System Voltage john deere d1a code full