John Deere 000630.11 – HCU: Dash Module Internal Issue During Boot Up

The control unit has failed an internal self-test during the power-on or boot-up process. This indicates an issue with the Electrically Erasable Programmable Read-Only Memory (EEPROM), meaning that the system's calibration data is either missing or corrupt, or the EEPROM chip itself has malfunctioned. This is a Priority 3 fault, which means it should be checked but may not immediately stop machine operation.

• 9450
• 9550
• 9650
• 9660
• 9750
• 9760
• 9860
• 9560 STS
• 9660 STS
• 9760 STS
• 9860 STS
• 9660 CTS
• 9540 WTS
• 9560 WTS
• 9580 WTS
• 9640 WTS
• 9660 WTS
• 9680 WTS

1. 1

   Cycle power by turning the key switch OFF, waiting 30 seconds, and restarting the machine to see if it resolves a temporary boot-up glitch

2. 2

   Check the display for other diagnostic trouble codes; multiple CAN bus communication errors could indicate a broader electrical issue rather than a single faulty module

3. 3

   Visually inspect the wiring harnesses and connectors leading to the Header Control Unit and Cornerpost Control Unit for any signs of damage, corrosion, or loose connections

1. 1

   Prepare the machine

   Attach the header to the combine and ensure the header wiring harness is securely connected. The machine should be on a level, firm surface.

2. 2

   Access diagnostic mode

   Start the combine. On the cornerpost display or CommandCenter, press the diagnostic switch. 'DIA' or a similar indicator will appear.

3. 3

   Access calibration mode

   Press the calibration switch. 'CAL' will appear on the display.

4. 4

   Select header calibration

   Use the up/down arrow keys to navigate through the calibration menus until 'hdr' is displayed.

5. 5

   Enter header calibration mode

   Press the enter switch to begin the header calibration process.

6. 6

   Follow on-screen prompts

   The display will guide you through the calibration steps, which typically involve raising and lowering the header to establish its range of motion.

7. 7

   Save calibration

   Once the calibration sequence is complete, save the settings as prompted.

8. 8

   Replace control unit

   If the header calibration procedure fails or does not clear the fault code, the control unit itself is likely faulty and will require replacement.