Case IH NH4001 – Armrest Controller (ARU / ARM / ACM): Auxiliary Stick Signal Out of Range Low

The Armrest Controller has detected that the voltage signal from the first auxiliary joystick (AUX1) is below the minimum expected threshold. This indicates a potential issue with the signal integrity, the joystick's internal sensor, the wiring harness, or the controller itself.

• Magnum
• Maxxum
• Steiger
• T-series

1. 1

   Retrieve all fault codes to check for related sensor supply voltage (e.g., ARM 8011 for low battery voltage) or CAN bus communication errors

2. 2

   Visually inspect the wiring harness and connectors leading to the auxiliary joystick in the armrest for damage, chafing, or loose connections

3. 3

   Measure the DC voltage at the signal wire for the AUX1 joystick with the key on to see if it is below the expected value (e.g., below 0.25V)

4. 4

   Verify the joystick sensor is receiving the correct supply voltage (often 5V or 8V) from the armrest controller

5. 5

   Check the integrity of the ground circuit for the joystick sensor

1. 1

   Address related faults

   If any other active faults are present, especially for power supply or CAN bus communication, diagnose and repair them first.

2. 2

   Repair wiring and connectors

   If visual inspection or voltage checks reveal damaged wires or corroded connectors, repair or replace them. Ensure all connections are clean and secure.

3. 3

   Calibrate auxiliary levers

   Enter the calibration menu for the armrest (ARM) or auxiliary levers (AUX) via the A-post display or diagnostic menu. Follow prompts to move each lever to full extend and retract positions, save the calibration, and cycle the key off before restarting.

4. 4

   Replace auxiliary joystick

   If wiring, supply voltage, and ground are good, and calibration fails to resolve the issue, the potentiometer or sensor within the joystick assembly has likely failed. Replace the joystick assembly and perform a recalibration.