John Deere 521570.09 – AIC (Armrest Interface Control Unit / Armrest Integrated Controller): Armrest Rear Hitch Setup Controls Module Message Missing

The AIC software fails to receive essential LIN messages from the armrest rear hitch setup controls module. The system identifies this as a data transfer or communication problem at Position S on the LIN Bus, causing the control unit to shift 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

   Inspect the Armrest Rear Hitch Setup Controls Module (Position S) for any visible signs of physical damage, liquid intrusion, or operational issues.

2. 2

   Ensure that all wiring harness connections related to the LIN Bus module are secure and intact. Look for pinched wires, corrosion in the connector pins, or loose grounds.

3. 3

   Utilize John Deere Service ADVISOR to analyze the LIN Bus module's ability to send and receive data accurately. Check for corresponding CAN/LIN bus voltage faults (e.g., shorts to ground or high source).

1. 1

   Repair wiring

   If diagnostic checks reveal damaged or loose wiring or connectors, repair or replace the affected harness section to restore communication.

2. 2

   Replace module

   If the wiring is intact and the LIN Bus module at Position S is found to be internally faulty and unable to transmit data, replace the Armrest Rear Hitch Setup Controls Module.

3. 3

   Reset and test system

   After any necessary repairs or module replacements, clear the fault codes, reset the system, and perform operational tests on the rear hitch dials (rate of drop, depth, lift upper limit) to ensure the module is fully operational and that all communication errors have been resolved.