John Deere 1533 – HCU: Return to Cut Sensor Voltage Too Low

The HEADERTRAK Return to Cut Sensor is reporting a voltage that is too low (less than 0.5 VDC) to the Header Control Unit (HCU). This condition indicates that the sensor is faulty or there is an issue within the associated wiring, such as a short to ground or an open circuit, preventing the system from accurately determining the header height.

• 9540 WTS
• 9560 WTS
• 9580 WTS
• 9640 WTS
• 9660 WTS
• 9680 WTS
• 9660 STS
• 9760 STS

1. 1

   Perform a visual inspection of the HEADERTRAK Return to Cut Sensor and its wiring harness for chafed or broken wires, loose connections, or physical damage.

2. 2

   Inspect the sensor arm and its mechanical linkage under the platform for damage, binding, or obstructions that might prevent it from moving freely.

3. 3

   Use a multimeter to check for open or shorted circuits (especially a short to ground) in the wiring connecting the sensor to the Header Control Unit. Normal height sensor power supply voltage is 4.8 to 5.2 VDC.

4. 4

   Review diagnostic addresses on the combine's display for the Header Control Unit (E01). Check Address 140 (a value of '0' signifies the input signal is less than 0.5V) and Address 146 (displays the feeder house position).

1. 1

   Disconnect power

   Turn off the combine and disconnect the battery before beginning any electrical repairs to ensure safety.

2. 2

   Repair or replace wiring

   If diagnostic checks revealed damaged wiring or a short to ground, repair or replace the affected sections. Ensure all connections are clean and secure.

3. 3

   Replace the sensor

   If the sensor is determined to be faulty, locate it near the header's skid plates or on the header frame. Disconnect the wiring harness, remove the securing bolts/screws, install the new sensor with correct alignment, and reconnect the harness.

4. 4

   Calibrate the header height control system

   Access the calibration procedure through the combine's diagnostic display. Set the minimum and maximum sensor positions by lowering the header to the ground and then raising it completely, following on-screen prompts.

5. 5

   Clear fault codes and test

   Clear the fault codes from the Header Control Unit. Start the combine and test the HEADERTRAK system to ensure it is functioning correctly.