CLAAS Id78D7h / 78D7h – EXT (A62): The CSM sequence cannot be started. Speed exceeds 20 km/h.

The CSM (CLAAS Sequence Management) sequence cannot be started because the vehicle speed exceeds the programmed safety threshold of 20 km/h. This is typically an operational limitation warning rather than a hardware failure.

• Arion 510-640
• Axion 800
• Axion 810
• Axion 830
• Axion 840
• Axion 850
• Axion 920
• Axion 950

1. 1

   Verify Operator Use: Confirm with the operator if they are trying to trigger the headland management sequence while driving over 20 km/h.

2. 2

   Verify Speed Sensor Data: If the tractor is stationary or moving slowly (under 20 km/h) but the code still triggers, check the live vehicle speed data on the CAN bus via the diagnostic terminal.

3. 3

   Check CAN Bus Communication: Verify that the CAN 'Speed' message is being properly sent from the dashboard module (DBD A101) to the EXT (A62) module.

4. 4

   Inspect Speed Sensors: Check the physical condition of the speed sensors (radar, GPS, or wheel speed sensors) for damage or debris that might cause erratic, falsely high speed readings.

5. 5

   Check the CSM Switch: Verify the integrity of the 'CLAAS Sequence Management' switch (S177) to ensure it isn't sending erratic activation signals.

1. 1

   Operational Correction

   Instruct the operator to reduce the vehicle speed to below 20 km/h before pressing the CSM activation buttons on the CMOTION or ELECTROPILOT joystick. In most cases, this clears the condition.

2. 2

   Sensor Diagnosis

   Connect a diagnostic laptop to the tractor's diagnostic port. Monitor the speed output from the radar, wheel sensors, and GPS.

3. 3

   Wiring Inspection

   If the speed reading is erratic or spiked above 20 km/h while moving slowly, trace the wiring harness from the faulty speed sensor to the DBD (A101) dashboard module. Look for chafed wires or loose connector pins.

4. 4

   Sensor Replacement

   If the wiring is intact but the sensor outputs a falsely high speed, replace the faulty speed sensor (radar or wheel sensor).

5. 5

   Clear Codes

   After replacing any faulty sensors or correcting the operator's driving parameters, clear the error codes from the EXT (A62) module and test drive the tractor below 20 km/h to ensure the CSM sequence activates normally.