John Deere 522580.19 – CCU: Front-Wheel Drive Switch, Fault

The control unit is detecting an invalid signal, open circuit, or short in the Mechanical Front Wheel Drive (MFWD) switch circuit.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6090MC
• 6090RC
• 6100MC
• 6100RC
• 6110MC
• 6110RC
• 5620
• 5720
• 5820
• 6100-6900 series
• 310J
• 410J
• 210K

1. 1

   Test switch positions (ON, OFF/Brake Assist, AUTO) using a multimeter or diagnostic tool to verify the MFWD switch signal circuit.

2. 2

   Inspect the 6-pin connector (Connector X75) at the back of the switch for pushed-out pins, corrosion, or moisture.

3. 3

   Check the wiring harness for continuity between the MFWD switch connector and the CCU to rule out broken wires or chafed harness shorts.

1. 1

   Power Down

   Turn off the tractor ignition and disconnect the negative battery cable.

2. 2

   Access the Switch

   Locate the MFWD switch on the right-hand control console or dash panel.

3. 3

   Remove the Switch

   Carefully pry the retaining clips of the rocker/toggle switch to pop it out of the console panel.

4. 4

   Disconnect

   Unplug the 6-pin electrical connector from the rear of the switch.

5. 5

   Replace

   Connect the 6-pin plug to the new OEM MFWD switch. Ensure the connector clicks securely into place.

6. 6

   Reinstall

   Snap the new switch back into the console cutout.

7. 7

   Clear Codes

   Reconnect the battery, turn the key to the ON position, and use your diagnostic tool or the tractor's onboard display to clear the CCU 522580.19 fault code.

8. 8

   Verify Operation

   Test the MFWD engagement in OFF, ON, and AUTO modes to ensure the repair is successful.