Field-IQ diagnostics 19 Diagnostics
1. Check for the right harness.
2. CT harness (John Deere) will always have pins 27 and 28 populated. These will be a power and a
ground that provides 8 V to the sensors. DO NOT ASSUME YOUR JD PLANTER HAS A CT
HARNESS IT MAY HAVE BEEN RETROFITTED WITHA PM STYLE HARNESS.
3. PM harness. (Also referred to as a Dickey John or DJ harness. Typically on all planters but JD.)
These harnesses will have pins 24-27 populated. 24 and 25 are 8 V power. 26 and 27 are ground.
If you have the correct harness and have power to the sensor:
Check that all the sensors have 8 V power and 5 volt signal. If not this could represent a bad seed
sensor harness.
Planter Seed Sensor troubleshooting
No communication with seed sensors.
1. Check that the Auxiliary I/O connector is plugged in.
2. A power cycle must be performed every time a cable is plugged in. The system only looks for
the sensors on boot up. If they are not present it won’t look for them until power is cycled.
3. Check that sensors are compatible with Field-IQ.
If the cables are connected:
1. Check for the right harness.
2. CT harness (John Deere) will always have pins 27 and 28 populated. These will be a power and a
ground that provides 8 V to the sensors. DO NOT ASSUME YOUR JD PLANTER HAS A CT
HARNESS IT MAY HAVE BEEN RETROFITTED WITHA PM STYLE HARNESS.
3. PM harness. (Also referred to as a Dickey John or DJ harness. Typically on all planters but JD.)
These harnesses will have pins 24-27 populated. 24 and 25 are 8 V power. 26 and 27 are ground.
If you have the correct harness and have power to the sensor:
Check that all the sensors have 8 V power and 5 volt signal. If not this could represent a bad seed
sensor harness.
Sprayer/Liquid Strip TillRate Control troubleshooting
Control valve will not open.
1. Check valve type in Rate control set up.
2. Check that hydraulic motor is receiving flow (PWM)(pump servo).
500 FM-1000 Integrated Display User Guide Version 9.25, Revision B
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