John Deere 521476.02 – AIC (Armrest Interface Control): Armrest Rear Hitch Setup Controls Module Circuit Fault

A Local Interconnect Network (LIN) data fault originating from the rear hitch setup controls module, indicating a disrupted data transfer or communication failure between the control software and the LIN Bus module at position 'S' or 'M'. The system typically shifts into a 'Limited Function' mode to prevent incorrect operation of the hitch.

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

1. 1

   Check for related AIC codes (such as 521480.02 or 521570.09) that may indicate a broader LIN bus failure rather than a single module issue.

2. 2

   Access the wiring harness for the LIN Bus Module at Position S inside the armrest and ensure all connections are secure, clean, and intact.

3. 3

   Inspect the wiring for physical damage such as pinches, chafing, or loose pins that could disrupt LIN data transfer to the AIC.

4. 4

   Use John Deere Service Advisor to perform diagnostic testing and analyze the LIN Bus module's ability to send and receive data accurately.

1. 1

   Power Down

   Turn off the tractor and disconnect the battery to prevent electrical shorts while working on the CommandARM™ console.

2. 2

   Access the Module

   Remove the necessary Command Arm covers (e.g., cover part R306996) to access the internal control modules.

3. 3

   Repair Wiring

   If the diagnostic checks revealed damaged or loose wiring on the LIN bus circuit, repair the wiring harness or replace the damaged connector pins.

4. 4

   Replace the Module

   If the wiring is intact and the module is confirmed faulty, disconnect the electrical connector from the Armrest Rear Hitch Setup Controls Module and remove the unit. Install the new module and securely reconnect the LIN bus harness.

5. 5

   Reassemble

   Reinstall the Command Arm covers and secure all housing components.

6. 6

   System Reset and Test

   Reconnect the battery. Turn the key on and use the CommandCenter display or Service Advisor to clear the stored AIC 521476.02 code. Test the Rate of Drop, Depth, and Lift Upper Limit dials to ensure the rear hitch responds correctly and no new codes are generated.