John Deere 1080 – Header Control Unit (E01): Height Sensor Power 2 Voltage Too Low

The voltage for Height Sensor Power 2 has dropped below the acceptable threshold of 4.75VDC. This specific power circuit is responsible for supplying power to both the CONTOUR MASTER™ Angle Sensor and the Header Raise Pressure Sensor. The underlying cause is typically a short circuit to ground in the associated wiring or a faulty voltage regulator within the Header Control Unit.

• 9560 STS
• 9660 STS
• 9760 STS
• 9860 STS

1. 1

   Enter diagnostic mode on the combine's display to view the status of the Header Control Unit (E01) and check the real-time voltage of 'Height Sensor Power 2 (cc# 471)'. A normal reading should be between 4.8 and 5.2 VDC.

2. 2

   Inspect the wiring harness connected to the CONTOUR MASTER™ Angle Sensor and the Header Raise Pressure Sensor for any signs of damage, abrasion, or loose connections.

3. 3

   Test the wiring for a short circuit to ground, as this is a common cause for the voltage to drop.

4. 4

   Check for any other related fault codes on the display.

5. 5

   Check sensor calibration, as an improperly calibrated CONTOUR MASTER™ system can sometimes trigger related fault codes.

1. 1

   Disconnect power

   For safety, disconnect the battery before beginning any electrical repairs.

2. 2

   Isolate the fault

   Disconnect both the CONTOUR MASTER™ Angle Sensor and the Header Raise Pressure Sensor. Turn the machine's key to the 'RUN' position without starting the engine. Measure the voltage on the 'Height Sensor Power 2' circuit. If the voltage returns to the normal range (4.8-5.2 VDC), one of the disconnected sensors is likely faulty and causing the short. Reconnect them one at a time to identify which one causes the voltage to drop. If the voltage remains low with both sensors disconnected, the issue is likely in the wiring harness or the Header Control Unit itself.

3. 3

   Repair or replace wiring

   If a short or damage is found in the wiring harness, repair the affected section or replace the harness if the damage is extensive.

4. 4

   Replace faulty sensor

   If a specific sensor was identified as the cause of the fault during the isolation step, replace it with a new OEM part.

5. 5

   Address the Header Control Unit

   If the wiring and sensors are determined to be in good condition, the fault likely lies with the voltage regulator within the Header Control Unit. Depending on the specific model and serviceability, this may require the replacement of the entire Header Control Unit.

6. 6

   Clear fault codes

   After completing the repairs, reconnect the battery and clear the fault codes using a diagnostic scanner or through the machine's onboard diagnostic system.

7. 7

   Recalibrate system

   If the CONTOUR MASTER™ Angle Sensor or Header Control Unit was replaced, a calibration of the CONTOUR MASTER™ system must be performed.