John Deere 002049.09 – TIQ: CAN Bus Cab Message Missing

A fault has been detected in the CAN BUS communication system indicating that messages from the Cab Module (TIQ) are not being received by other control units on the network within the expected timeframe (abnormal update rate). This communication breakdown can result in a range of symptoms, from non-functional controls to the machine stopping and placing itself in park.

• 7715
• 7815
• 6J Series
• 6145J
• 6165J
• 6180J
• 6205J
• 9x30 Series
• 9230
• 9330
• 9430
• 9530
• 9630
• 6M Series
• 6R Series
• 8x30 Series
• 8130
• 8230
• 8330
• 8430
• 8530
• 9R Series
• 9360R

1. 1

   Check fuses related to the cab and instrument controllers (specifically F22 or F35 depending on the model)

2. 2

   Restart the tractor to see if a power cycle clears an intermittent communication fault

3. 3

   Visually inspect the CAN bus wiring harness for abrasions, pinch points, or sharp bends

4. 4

   Inspect connectors for corrosion (green/white powder), loose pins, or moisture intrusion

5. 5

   With battery disconnected, measure CAN bus resistance between CAN High and CAN Low at a diagnostic connector (should be approximately 60 Ohms)

6. 6

   With key on and engine off, measure CAN bus DC voltage relative to ground (CAN High, typically a yellow wire, and CAN Low, typically a green wire, should both be approximately 2.5 volts)

1. 1

   Check fuses and restart

   Check fuses F22 or F35 and restart the tractor to clear potential intermittent faults.

2. 2

   Clean and reseat connectors

   Disconnect the battery. Locate connectors for the affected controllers (ICU, ACU, etc.) and major CAN bus connection points in the cab. Clean contacts with a wire brush, apply dielectric grease to protect against moisture, and firmly reseat them.

3. 3

   Test CAN bus resistance

   With the battery disconnected, measure resistance between CAN High and CAN Low. A reading of ~120 Ohms indicates a missing terminating resistor or open circuit. A reading near 0 Ohms indicates a short between the wires.

4. 4

   Isolate faulty component

   If resistance is incorrect or the fault is intermittent, unplug one CAN bus module at a time. Re-check resistance or restart the machine to see if the fault clears, which will identify the problematic module or harness section.

5. 5

   Replace or repair faulty component

   Repair or replace the damaged section of the CAN bus wiring harness, or replace the specific control module identified as the source of the fault.

6. 6

   Program new control unit

   If a control unit was replaced, have an authorized John Deere dealer program or calibrate the new module to ensure correct communication on the network.