John Deere 002003.07 – Cab Module (TIA): CAN Bus Message Fault in Cab Module

A fault has been detected related to the CAN BUS message in the Cab Module (TIA - Tractor-Implement Automation). This indicates an issue with communication or message integrity within the system (SPN 2003, FMI 7). The Cab Module is not receiving expected messages from another control unit on the CAN bus, or the messages being received are incorrect. This communication breakdown can lead to reduced functionality of certain features or prevent the machine from operating entirely.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R

1. 1

   Visually inspect the wiring harness and connectors associated with the TIA module and other CAN bus control units for chafed wires, pinched wires, loose connections, or corrosion

2. 2

   Check battery and power supply to ensure the battery is fully charged and connections are clean and tight, as low voltage can cause CAN bus faults

3. 3

   Enter Diagnostic Test Mode (by cycling the key switch) to verify the electrical function of individual switches and identify circuit problems

4. 4

   Perform a CAN Bus Resistance Check with the machine powered off: measure resistance between CAN High and CAN Low (should be ~60 ohms; ~120 ohms indicates a terminating resistor issue, near zero indicates a short circuit)

5. 5

   Perform a CAN Bus Voltage Check with the machine powered on: CAN High should be approximately 2.5 to 3.5 volts, and CAN Low should be about 1.5 to 2.5 volts. Incorrect voltages can point to a faulty transceiver or wiring issue.

1. 1

   Address immediate issues

   If the visual inspection revealed any damaged wiring, chafed wires, or loose connections, repair or replace them as necessary. Clean any corroded terminals.

2. 2

   Isolate the faulty module

   If CAN bus resistance and voltage checks are abnormal, disconnect control modules one by one. After disconnecting each module, re-check the resistance and voltage to see if they return to normal, which identifies the source of the problem.

3. 3

   Perform a cold boot

   Disconnect the battery for a period of time to reset all electronic modules. This can sometimes resolve temporary communication glitches.

4. 4

   Check for software updates

   Contact a John Deere dealer to ensure all control modules have the latest software updates installed.

5. 5

   Replace the faulty module

   If a specific control module is identified as the cause of the fault, replace it with the correct part.