John Deere 522768.05 – Steering System Control Unit (XSC / XSA / TSB / XSB): Steering System Control Unit Valve Ground 1 Open Circuit

The control unit has detected an open circuit (a broken wire, disconnected plug, or internally failed coil) on the ground side of the circuit controlling Steering Valve 1.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 8235R
• 8245R
• 8260R
• 8285R
• 8310R
• 8335R
• 8360R
• 8400R
• 8310RT
• 8335RT
• 8360RT
• 9470RT
• 9520RT
• 9570RT
• 6145J
• 6165J
• 6180J
• 6205J

1. 1

   Inspect the wiring harness between the Steering Control Unit (XSC/XSA/TSB) and the steering valve for chafed wires, rodent damage, or breaks.

2. 2

   Disconnect the harness at the steering valve and the control unit to inspect the pins for corrosion, pushed-back terminals, or moisture.

3. 3

   Use a multimeter to check the continuity of the ground wire for Valve 1 from the control unit connector to the valve connector.

4. 4

   Measure the resistance across the steering valve coil to ensure it is not internally open.

1. 1

   Relieve Pressure

   With the engine off, turn the steering wheel in both directions several times to relieve trapped hydraulic pressure in the steering circuit.

2. 2

   Locate the Valve

   Remove side shields or panels as necessary. On many 8R models, the steering priority valve block is located near the transmission oil filters.

3. 3

   Disconnect Hydraulics & Electrical

   Disconnect the electrical connector from the faulty valve. Mark and disconnect the hydraulic lines, being prepared to catch residual oil.

4. 4

   Remove and Replace

   Remove the mounting bolts securing the valve. Install the new valve assembly, ensuring all O-rings on the hydraulic fittings are replaced and seated correctly.

5. 5

   Bleed the System

   Start the engine and cycle the steering wheel a minimum of six complete turns from lock-to-lock to bleed air from the hydraulic system.

6. 6

   Verify

   Check for hydraulic leaks and clear the diagnostic fault codes using a John Deere service tool.