John Deere 521421.02 – AIC (Armrest Interface Control): Armrest Hitch Controls Module Circuit Fault

The system has detected an incorrect LIN Bus message originating from the LIN Bus Module at 'Position M', indicating an internal fault or a data transfer problem between the Armrest Interface Control (AIC) software and the LIN Bus module responsible for hitch control. The control unit will restrict the operational capabilities of the hitch, placing it into a 'Limited Function' mode.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 8225R
• 8245R
• 8270R
• 8295R
• 8320R
• 8335R
• 8345R
• 8370R
• 8400R
• 9470RT
• 9520RT
• 9570RT

1. 1

   Inspect the LIN Bus Module at Position M for physical damage, electronic failure, or internal errors

2. 2

   Test electrical circuit integrity to ensure signal pathways are continuous and free from disruptions

3. 3

   Inspect the LIN/CAN Bus network for physical defects such as damaged wires, poor connections, or electrical noise causing transmission errors

4. 4

   Use diagnostic software to monitor LIN Bus traffic, identify sources of errors, and check for incompatible or malfunctioning devices

1. 1

   Repair Wiring and Connections

   Address any identified issues with the wiring harness or connectors. Ensure all electrical components on the LIN Bus network are securely connected and free of corrosion.

2. 2

   Replace Defective Modules

   If diagnostic testing confirms that the LIN Bus Module at Position M or the Armrest Hitch Controls Module is defective and cannot transmit data properly, remove and replace the faulty module.

3. 3

   Reevaluate System Post-Repair

   After completing the repairs or module replacements, reset the system error counters.

4. 4

   Operational Testing

   Perform operational tests on the CommandARM to verify that the rear hitch controls are functioning correctly and that no further signal errors or limited function modes are triggered.