John Deere 523343.19 – SCO: Incorrect CAN Bus Message, Information from AIC Control Software

The value of the multi-function lever (specifically function 3 / the trigger switch) cannot be determined and provided on the CAN Bus by the AIC (Armrest Interface Control) software. Because the system cannot verify the lever's position, a transmitted replacement value generates this diagnostic trouble code, and the associated Selective Control Valve (SCV) is disabled for safety.

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

1. 1

   Check for Priority AIC Codes: In its active state, this fault can also generate diagnostic trouble codes directly at the AIC control software. AIC codes take priority and must be diagnosed first.

2. 2

   Inspect CAN Bus Wiring: Check all CAN Bus wiring and harnesses between the Armrest Multi-Function Lever, the AIC module, and the SCO for signs of physical damage, loose pins, or corrosion.

3. 3

   Verify Multi-Function Lever Operation: Ensure that the multi-function lever's trigger switch is not physically stuck, broken, or jammed with debris.

4. 4

   Test CAN Bus Network: Use John Deere Service ADVISOR to test the CAN Bus network for proper communication. Monitor the live data for the multi-function lever to see if the trigger switch state changes when manually pressed.

1. 1

   Read and Clear Codes

   Connect the diagnostic tool and read all active/stored codes. If AIC module codes are present, troubleshoot the armrest circuitry first.

2. 2

   Harness Repair

   If the diagnostic checks reveal a voltage drop or open circuit on the CAN Bus lines between the armrest and the chassis module, repair or replace the damaged wiring harness section. Secure all connections.

3. 3

   Recalibrate the Lever

   If the wiring is intact but the signal is out of range, attempt to recalibrate the multi-function lever using the tractor's CommandCenter™ display or Service ADVISOR.

4. 4

   Replace the Component

   If calibration fails or the trigger switch is internally shorted/open, the multi-function lever controller (or the specific switch module, depending on the exact cab configuration) must be replaced.

5. 5

   Final Testing

   Clear the SCO 523343.19 code. Start the tractor and test the Selective Control Valves (SCVs) via the multi-function lever to ensure hydraulic functions have been restored.