John Deere 523824.05 – SSU/SST: Steering Wheel Position Sensor Voltage Problem

The Steering System Control Unit (SSU) has detected an issue with the electrical circuit of the second steering wheel position sensor, indicating low voltage or an abnormally low current (less than 4 mA). The steering system uses two position sensors to provide redundant and accurate steering wheel position data. A fault in one of these sensors causes the system to question the validity of the steering input, leading to the disengagement of the AutoTrac™ assisted steering system as a safety precaution.

• 7020LF
• 7030LF
• 8030
• 8R
• 8130
• 8230
• 8330
• 8430
• 8530
• 8230T
• 8330T
• 8430T
• 9030
• 9230
• 9330
• 9430
• 9530
• 9630
• 9320
• 9420
• 9520

1. 1

   Confirm that fault code 523824.05 is active or stored in the SSU or SST controller.

2. 2

   Visually inspect the wiring harness and connectors between the steering wheel position sensor and the SSU for signs of damage, corrosion, or loose connections.

3. 3

   Isolate the faulty component by swapping the electrical connectors for the two steering wheel position sensors (located on the steering shaft under the steering column cowl).

4. 4

   After swapping the connectors, clear the codes and operate the steering. If code 523824.05 returns, the issue is likely in the wiring harness between the sensor and the SSU.

5. 5

   If a new fault code corresponding to the first steering wheel position sensor appears (e.g., SSU 1807.05) after swapping connectors, the Steering Input Device (SID) is likely faulty.

6. 6

   Consult official technical manuals (e.g., TM2254 for 9430-9630 or TM2280 for 8130-8530) for model-specific wiring diagrams and in-depth circuit tests.

1. 1

   Disconnect battery

   Before starting any electrical repairs, disconnect the battery to prevent electrical shorts.

2. 2

   Access steering sensors

   Remove the steering column cowls and covers to access the steering wheel position sensors located on the steering shaft.

3. 3

   Repair wiring harness

   If diagnostic checks point to a wiring issue, carefully trace the wires from the sensor connector back to the SSU. Repair any breaks, chafing, or corroded sections of the wire and ensure all connectors make a clean, solid connection.

4. 4

   Replace sensor or SID

   If the sensor itself is determined to be faulty, unplug the electrical connector, remove the mounting hardware securing it to the steering column, and install the new sensor or complete Steering Input Device (SID). Ensure it is correctly aligned before reconnecting.

5. 5

   Reassemble and test

   Reinstall the steering column covers, reconnect the battery, and clear all fault codes. Operate the tractor and steering system to ensure the fault code does not return and AutoTrac is working correctly.

6. 6

   Calibrate steering system

   Perform a steering system calibration procedure if required by the operator's or service manual for your specific tractor model.