John Deere 521276.09 – AIC: LIN Bus 3 Fault

Incorrect or missing message from the LIN Bus Module located at Position K or P. The system is receiving no data from the LIN Bus 3 network, which points to a data transfer problem between the control software and the LIN Bus 3. This means there is either a communication breakdown in the LIN Bus wiring 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

   Inspect the LIN Bus 3 wiring harness for continuity, shorts to ground, or open circuits between the Armrest Interface Control Unit (AIC) and the LIN Bus Module at Position K or P.

2. 2

   Check the electrical connectors at both the AIC and the LIN Bus Module (mounted beside the PTO switch) for corrosion, bent pins, moisture, or loose connections.

3. 3

   Verify if other LIN Bus modules on the network are communicating properly. If multiple modules are down, the issue is likely the main bus wiring. If only Position K or P is failing, the issue is isolated to that specific module or its direct connector.

1. 1

   Power down the tractor and disconnect the battery to prevent electrical shorts.

2. 2

   Access the Armrest Interface Control Unit (AIC) and locate the LIN Bus Module at Position K or P (typically mounted beside the PTO switch on the armrest console).

3. 3

   Disconnect the harness from the module and perform a pin drag test and visual inspection of the terminals.

4. 4

   Repair or replace any damaged wiring or connectors found in the LIN Bus 3 circuit.

5. 5

   If the wiring harness and connectors test good, the LIN Bus Module (Position K or P) has failed internally and must be replaced.

6. 6

   Install the new module and securely reconnect the harness.

7. 7

   Reconnect the battery power.

8. 8

   Turn the key to the ON position, clear the stored fault codes, and test the Light/Radio, Air con module, and Rear Remote Switch unit to confirm proper operation and that the code does not return.