John Deere 521422.02 – AIC: Armrest Hitch Controls Module Circuit Fault / LIN Bus Communication Fault in Hitch Controls

There is a data transfer problem between the AIC control software and the LIN Bus module for hitch control. The system has detected an incorrect LIN Bus message originating from the LIN Bus Module at Position M, pointing to an internal fault or communication breakdown. When this code is active, the control unit will limit the functionality of the hitch control system to prevent unintended operations.

• 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 communication lines between the AIC and the Armrest Hitch Controls Module (LIN Bus Module Position M) for physical damage, disconnection, or interference.

2. 2

   Check for electrical noise, faulty grounds, or incompatible devices on the network that could cause persistent communication errors.

3. 3

   Perform diagnostic tests on the Armrest Hitch Controls Module to verify its operational status and ability to send and receive LIN messages accurately.

1. 1

   Restore Connections

   Repair or replace any faulty wiring within the communication network. Ensure all connections to the AIC and the Armrest Hitch Controls Module (A057) are secure and properly shielded to prevent interference.

2. 2

   Software/Firmware Review

   Update or reconfigure the software and firmware settings in both the AIC and the hitch control module to correct any discrepancies or bugs that could be affecting communication.

3. 3

   Component Replacement

   If the wiring is intact and software updates do not resolve the issue, the internal fault lies within the hardware. Replace the defective Armrest Hitch Controls Module (A057) or, if the bus controller itself is failed, the Armrest Interface Control Unit (AIC).

4. 4

   System Reset and Test

   After implementing repairs and adjustments, cycle the key switch to reset the control systems. Perform rigorous operational testing of the rear hitch controls to ensure that messages are being transmitted and received without any issues.