John Deere 639.14 – Armrest Interface Control Unit (AIC): Vehicle CAN BUS Fault / CAN Bus Error Limit Exceeded

The control unit detects a very high error rate on the Vehicle CAN BUS network, meaning the module is receiving an excessive number of incorrect CAN BUS messages, or there is a general connectivity problem within the network. This causes the control unit to disable or degrade certain functions to prevent erroneous operations or data corruption.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 8225R
• 8245R
• 8270R
• 8295R
• 8310RT
• 8320R
• 8335R
• 8345R
• 8360RT
• 8370R
• 8400R
• 9360R
• 9410R
• 9430
• 9460R
• 9470RT
• 9510R
• 9520RT
• 9530
• 9560R
• 9570RT
• 9630
• 7210R
• 7230R
• 7250R
• 7270R
• 7290R
• 6M-1654
• 6M-1854
• 6M-2104
• 5090R
• 5100R
• 5115R
• 5125R

1. 1

   Inspect all CAN BUS wiring and connectors leading to the Armrest Interface Control Unit (AIC) for signs of physical damage, corrosion, or loose connections

2. 2

   Use John Deere diagnostic tools (like Service ADVISOR) to test the integrity of the CAN BUS network for electrical interference, signal degradation, or specific data packet failures

3. 3

   Ensure that the CAN BUS termination resistors are present, securely connected, and functioning correctly to maintain network stability

4. 4

   Systematically test other modules connected to the CAN BUS (such as the Remote Power Train or Engine Speed Control modules) to ensure a different malfunctioning module isn't flooding the network with bad data

5. 5

   Verify that the AIC and interfacing modules are running the latest firmware, as software bugs can hinder communication

1. 1

   Secure and Clean Connections

   Disconnect the harnesses at the AIC. Clean the pins to remove any corrosion and securely reconnect them to ensure reliable communication.

2. 2

   Repair Wiring

   If any CAN BUS wires are found to be shorted, open, or damaged, repair or replace the affected harness sections.

3. 3

   Replace Faulty Components

   If diagnostic testing proves the Armrest Interface Control Unit (AIC) has an internal hardware failure or a burnt CAN transceiver, remove and replace the AIC module.

4. 4

   Update Software

   Apply any available firmware or software updates to the AIC and other CAN BUS modules to ensure they are operating with the latest fixes.

5. 5

   Reboot and Clear Codes

   Reset or reboot the control units involved to clear any transient errors or glitches. Clear the 000639.14 code using a diagnostic tool.

6. 6

   Test Run

   Conduct a thorough test run of the tractor's armrest functions to ensure that messages are being correctly received by the AIC and that full functionality has been restored without the code returning.