John Deere 1565 – ACU: CAN Bus Message Missing from Armrest Control Unit - Header and Separator Engaged

The system has detected that a CAN Bus message is missing from the Armrest Control Unit (ACU) when the Header and Separator are engaged. This indicates a communication interruption within the control unit or its associated circuitry on the Controller Area Network (CAN bus). The loss of this message prevents the exchange of status information between electronic control units.

• 9540
• 9560
• 9580
• 9640
• 9660
• 9680
• 9560 STS
• 9650 STS
• 9660 STS
• 9750 STS
• 9760 STS
• 9860 STS
• 9870 STS

1. 1

   Verify code activity through the machine's display to confirm fault code 1565 is currently active

2. 2

   Inspect the wiring harness and connectors between the Armrest Control Unit and the main CAN bus network for physical damage, rodent damage, chafing, or corrosion (particularly behind the plug panel in the cab)

3. 3

   Check CAN bus terminating resistors by measuring resistance between CAN High (yellow wire) and CAN Low (green wire), which should measure approximately 60 Ohms on a healthy system

4. 4

   Perform a cold boot by disconnecting the battery for at least 30 seconds to allow all control units to reset

5. 5

   Check for other active CAN bus error codes that might indicate a systemic issue, central controller problem, or major wiring harness failure

1. 1

   Disconnect and reconnect ACU

   Disconnect the main electrical connectors to the Armrest Control Unit (often labeled X653 and X654), inspect the pins for damage or corrosion, and securely reconnect them.

2. 2

   Isolate the Armrest Control Unit

   If the problem persists, disconnect the ACU to determine if it is the source of the network disruption by observing if other CAN bus errors resolve.

3. 3

   Replace the Armrest Control Unit

   If diagnostics confirm the Armrest Control Unit is faulty and the communication condition persists, replace the unit.