Case IH 55049 – Steering Controller (STEERING): No current is sensed flowing through the RELAY driver pin when expected

The control module is commanding a steering-related relay to activate, but it detects zero or abnormally low current draw on the driver circuit (specifically at Pin C056-7). This typically points to an open circuit, a disconnected harness, a pushed-out pin, or a failed relay coil.

• STX Steiger
• STX Steiger Series
• STX 275
• STX 280
• STX 285
• STX 325
• STX 330
• STX 335
• STX 375
• STX 380
• STX 385
• STX 425
• STX 430
• STX 435
• STX 440
• STX 450
• STX 480
• STX 485
• STX 500
• STX 530
• STX 535

1. 1

   Locate the Steering Controller and disconnect connector C056. Inspect Pin 7 specifically for corrosion, moisture, bent pins, or a pin that has been pushed out of the plastic connector housing.

2. 2

   Trace the wire from Pin C056-7 to the corresponding steering relay in the fuse/relay panel. Use a multimeter to check for continuity to rule out an open wire or break in the harness.

3. 3

   Remove the affected steering relay and test the resistance across the relay coil pins. If the coil is open (infinite resistance), the relay has failed.

4. 4

   Verify that the relay block and the steering controller have clean, tight ground connections.

1. 1

   Power Down

   Turn off the tractor and disconnect the negative battery cable to prevent electrical shorts during repair.

2. 2

   Access the Steering Controller

   Locate the steering controller module (usually located in the cab console or under the cab floor depending on the exact STX model).

3. 3

   Repair the Harness/Connector

   If Pin C056-7 is pushed out or damaged, use a pin-extraction tool to remove it. Crimp a new terminal onto the wire and re-seat it firmly into the C056 connector block. If the wire is broken between the controller and the relay panel, splice and solder a repair wire, sealing it with heat-shrink tubing.

4. 4

   Replace the Relay

   If the harness tests good but the relay coil is open, replace the steering relay with a new OEM equivalent.

5. 5

   Reassembly

   Reconnect the C056 connector to the steering controller. Reinstall the relay into the fuse/relay panel.

6. 6

   Clear Codes and Test

   Reconnect the battery. Turn the key to the ON position and use the tractor's AFS/Pro display or diagnostic tool to clear the inactive 55049 fault code. Start the tractor and cycle the steering lock-to-lock to ensure the code does not return and the steering priority systems function correctly.