John Deere 709.2 – Steering System Control Unit (XMC, XMA, XSC, TMA, PSC): Steering System Control Unit Fault - Steering Wheel Position Sensor Channel 2 Fault

Indicates a Steering System Control Unit Fault, specifically isolated to a Steering Wheel Position Sensor Channel 2 Fault (often referred to as the Steering Input Device or SID). The control unit monitors both signals for redundancy and accuracy. This code triggers when the controller detects an invalid signal, open circuit, or internal failure on Channel 2 of the sensor, which will typically disable automated steering systems like AutoTrac™ and may trigger a warning light.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 8225R
• 8235R
• 8245R
• 8260R
• 8270R
• 8285R
• 8295R
• 8310R
• 8320R
• 8335R
• 8345R
• 8360R
• 8400R
• 8100T–8430T
• 8320RT
• 8345RT
• 9300T–9630T
• 9470RT
• 9520RT
• 9570RT
• 6145J
• 6165J
• 6180J
• 6205J
• CH570
• CH670
• 3520

1. 1

   Visual & Harness Inspection: Access the steering column cowl and inspect the wiring harness and connectors leading to the Steering Input Device (SID). Look for signs of an open circuit, loose pins, or corrosion on the Channel 2 circuit.

2. 2

   Voltage/Current Verification: Verify that the power supply to the sensor is within specification (typically above 4.75V) and return current should not fall below 4 mA.

3. 3

   Cross-Testing (If Applicable): Interchange the steering wheel position sensor connectors at the SID. Clear the codes and turn the steering wheel. If the same Channel 2 DTC returns, the issue is likely in the wiring harness between the SID and the Steering Control Unit (XMC). If the DTC shifts to the other position sensor channel, the Steering Input Device (sensor) itself has failed internally.

4. 4

   Software Check: Ensure the Steering System Control Unit software is up to date, as software anomalies can sometimes cause false signal mismatch codes.

1. 1

   Preparation

   Park the machine on a level surface, turn off the engine, and disconnect the battery to prevent electrical shorts.

2. 2

   Access the Sensor

   Remove the steering column covers/cowl beneath the steering wheel to expose the steering shaft and the Steering Input Device (SID).

3. 3

   Disconnect

   Carefully unplug the electrical harness connectors from the faulty Steering Wheel Position Sensor.

4. 4

   Removal

   Unbolt and slide the faulty position sensor assembly off the steering column/shaft.

5. 5

   Installation

   Mount the new Steering Wheel Position Sensor into position and secure the mounting hardware.

6. 6

   Reassembly

   Reconnect the electrical harness, ensuring the connector locks firmly into place. Reinstall the steering column covers.

7. 7

   Calibration

   Reconnect the battery. Connect a John Deere diagnostic tool (Service ADVISOR) to clear the inactive 000709.20 fault code. Crucial Step: You must perform a steering system calibration procedure so the XMC module can learn the end-stops and center position of the new sensor.

8. 8

   Testing

   Test the steering manually from lock to lock, then engage AutoTrac™ to ensure the system operates without kicking out.