John Deere 521275.09 – AIC (Armrest Interface Control Unit): LIN Bus 2 Fault

Incorrect LIN Bus 2 message or no data is being received from the LIN Bus 2 network (Information from LIN Bus Module at Position E or M). This points to a data transfer problem between the AIC control software and the LIN Bus 2 network, indicating a communication breakdown in the LIN Bus itself or a failure in the transmitting LIN Bus module.

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

1. 1

   Visually inspect the LIN Bus 2 network, focusing on modules at Positions E and M (Rear Hitch Depth Control Unit and SCV 2/3 Rear Remote Switch unit) for physical damage, broken wires, or disconnected harnesses.

2. 2

   Use John Deere Service ADVISOR to test the integrity and functionality of the LIN Bus 2 network, looking for breaks or degradation in communication lines.

3. 3

   Examine the settings and configurations of the LIN Bus modules to ensure they are correctly set up for transmitting data.

4. 4

   Check for software updates or patches for the Armrest Interface Control Unit (AIC) that might resolve known communication issues.

1. 1

   Power Down

   Turn off the machine and disconnect battery power before servicing electrical components to prevent short circuits.

2. 2

   Wiring Repair

   If the diagnostic checks revealed breaks or degradation in the LIN Bus 2 communication lines, repair or replace the affected wiring harness and connectors between the AIC and the rear control units.

3. 3

   Module Replacement

   If the wiring is intact but a specific module is identified as faulty (failing to transmit data), replace the faulty transmitting module (Rear Hitch Depth Control Unit or SCV 2/3 Switch Unit). If the transmitting modules are functioning but the AIC cannot process the signal, the Armrest Interface Control Unit (AIC) itself may need to be replaced.

4. 4

   Recalibration

   After addressing the physical and configurational aspects of the LIN Bus 2 network, recalibrate the network.

5. 5

   System Test

   Perform a thorough system test to ensure that data is being transmitted and received correctly across all connected devices and that the fault code clears.