John Deere 523698.09 – SSU, CCU, SST, SMV: GreenStar CAN Bus Communication Failure

This fault code indicates a communication breakdown within the GreenStar™ or Ag Management Solutions (AMS) system. The Sequence Control Unit (SMV) or Steering System Control Unit (SSU) is not receiving expected data signals from GreenStar components over the CAN bus. The '.09' suffix designates a communication system issue, typically pointing to wiring, connectors, or electronic module failures.

• 9330
• 9430
• 9530
• 9630
• 8130
• 8230
• 8330
• 8430
• 8530
• 8310RT
• 8335RT
• 8360RT
• 6020
• 6120
• 6220
• 6320
• 6420

1. 1

   Visually inspect physical connections for the GreenStar™ system, including the main display connector, GPS/StarFire™ receiver harness, and mobile processor connector for loose, corroded, or damaged pins.

2. 2

   Power cycle the vehicle by turning the key switch off, waiting a moment, and restarting to clear temporary communication glitches.

3. 3

   Inspect system controller fuses, specifically F23 (often associated with the SSU), F6 (IVT), or F35 (PowrQuad Plus).

4. 4

   Check CAN bus health in the GreenStar™ display diagnostics menu for increasing 'Passive', 'Warn', or 'Bus Off' error counts.

1. 1

   Perform initial diagnostics

   Complete all visual inspections, power cycles, and fuse checks. If the code clears, the issue was likely a temporary glitch or loose connection.

2. 2

   Test CAN bus voltage

   Using a multimeter or advanced diagnostic tools, test the CAN High and CAN Low wires for proper voltage (approximately 2.5V each).

3. 3

   Test circuit resistance

   Measure the overall circuit resistance of the CAN bus to check for wiring faults or faulty terminating resistors.

4. 4

   Isolate faulty component

   Disconnect individual components from the CAN bus one at a time to isolate which component (display, receiver, or control unit) is causing the communication failure.

5. 5

   Contact authorized dealer

   If the issue persists and cannot be isolated manually, contact a John Deere dealer. Further diagnosis requires John Deere Service ADVISOR™ and specialized CAN bus architecture knowledge.