John Deere 522580.19 – CCU (Chassis Control Unit): Front-Wheel Drive Switch, Fault

Malfunction in the Mechanical Front Wheel Drive (MFWD) switch circuit. The controller is detecting an invalid, missing, or out-of-range electrical signal from the rocker switch used by the operator to engage or disengage the front-wheel drive.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6090MC
• 6090RC
• 6100MC
• 6100RC
• 6110MC
• 6110RC
• 6M
• 6R
• 6000 Series
• 7000 Series

1. 1

   Check the cab fuse panel for blown fuses related to the transmission or MFWD switch (often a 15-amp fuse).

2. 2

   Inspect the MFWD switch on the side console for physical damage, sticking, or lack of tactile 'click' when toggled.

3. 3

   Remove the console trim to access the back of the switch and inspect the wiring harness plug (often a 6-pin connector) for loose pins, pushed-out wires, or corrosion.

4. 4

   Unplug the switch and use a multimeter to test for continuity across the switch terminals in both the ON and OFF positions. If the switch does not show a change in state, it has failed internally.

5. 5

   Verify that the switch is receiving reference voltage from the CCU when the key is in the ON position.

1. 1

   Prepare machine

   Park the tractor on a level surface, apply the parking brake, turn off the engine, and disconnect the negative battery terminal to prevent electrical shorts.

2. 2

   Locate switch

   Locate the MFWD switch on the right-hand operator console.

3. 3

   Access switch

   Depending on the model, either carefully pry the switch upward out of its mounting bracket using a plastic trim tool, or remove the retaining screws for the side console panel to access the underside.

4. 4

   Disconnect harness

   Depress the locking tab on the electrical harness connector and unplug it from the bottom of the switch.

5. 5

   Remove old switch

   Remove the old switch from the panel.

6. 6

   Install new switch

   Snap the new OEM switch into the console bracket until it clicks securely into place.

7. 7

   Reconnect harness

   Reconnect the electrical harness to the new switch.

8. 8

   Reassemble and reconnect battery

   Reinstall any console panels that were removed and reconnect the battery.

9. 9

   Test and clear codes

   Turn the ignition ON, clear the stored CCU fault codes via the diagnostic monitor, and test the MFWD engagement to ensure the code does not return.