John Deere 520286.09 – Rear Chassis Module (HCC): Rear Hitch Set Lower Set Point Button CAN Message Missing

The control module expects to receive a continuous or specific CAN data message from the rear hitch raise/lower button (external fender switch or in-cab set point button), but the signal is missing. This typically indicates a broken wire, a corroded connector, a failed switch, or a CAN bus network interruption.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 8245R to 8400R
• 9470RT
• 9520RT
• 9570RT

1. 1

   Inspect the rear hitch raise/lower buttons (both the in-cab controls and the external fender-mounted switches) for physical damage, sticking mechanisms, or water ingress.

2. 2

   Trace the wiring harness from the affected hitch button to the Rear Chassis Module (HCC). Look for chafed wires, pinched harnesses, or corroded/loose connector pins.

3. 3

   Using a multimeter or an oscilloscope, verify the integrity of the CAN High and CAN Low communication lines at the switch connector. Ensure there is proper voltage and no short to ground or power.

4. 4

   Ensure the HCC module itself is receiving proper power and ground, and that it is successfully communicating with other modules on the tractor's network.

1. 1

   Power Down

   Turn off the tractor ignition and disconnect the negative battery cable to prevent electrical shorts during testing.

2. 2

   Access the Switch

   Locate the specific rear hitch raise/lower button that is failing to communicate.

3. 3

   Clean Connections

   Disconnect the switch harness. Spray the connector pins with electrical contact cleaner and check for pushed-back pins. Reconnect and test to see if the code clears.

4. 4

   Repair Harness

   If the wiring harness fails a continuity test between the switch and the HCC, repair the broken wires or replace the damaged section of the harness.

5. 5

   Replace the Switch

   If the wiring and CAN bus lines are verified as intact but the switch is still not broadcasting its CAN message, the internal circuitry of the switch has failed. Replace the switch assembly.

6. 6

   Replace the HCC

   If the switch and wiring are both verified as fully functional, the fault lies within the Rear Chassis Module (HCC) failing to process the signal. Replace the HCC.

7. 7

   Reassembly and Clearing Codes

   Reconnect the battery, turn on the ignition, and use a John Deere Service ADVISOR tool (or equivalent diagnostic scanner) to clear the stored 520286.09 fault code. Test the rear hitch raise/lower functionality to ensure the repair is successful.