Case IH 69 – Armrest Controller (ARM): Hitch Position Command potentiometer has failed

The controller is receiving an invalid, out-of-range, or missing electrical signal from the potentiometer on the armrest console, which is responsible for communicating the operator's desired rear hitch height/position to the system.

• MX Magnum
• STX Steiger
• STX Steiger series
• MX Magnum and Magnum series
• TG Series
• Puma series

1. 1

   Inspect connector ends for damaged, bent, loose, or dislocated pins.

2. 2

   Check the 5V supply circuit for proper voltage.

3. 3

   Check the wiring between Pin 8 of connector C051 and Pin 16 of connector C027 for a short to power.

4. 4

   Check the wiring between Pin 6 of connector C051 and Pin 13 of connector C027 for a short to power.

1. 1

   Visual Inspection

   Examine the armrest console wiring harness and the physical condition of the hitch position command dial/potentiometer.

2. 2

   Attempt Calibration

   Enter the Armrest Calibration Hitch Menu via the instrument cluster (ICU2) and perform the hitch calibration procedure.

3. 3

   Test the Potentiometer

   If the calibration fails (which may trigger a secondary code like ARM 9021: "Hitch position command potentiometer calibration results not acceptable") or if code 69 returns, test the position command potentiometer function directly at the armrest controller using a multimeter.

4. 4

   Replace the Component

   If the potentiometer fails the electrical sweep test (voltage/resistance is erratic or dead), replace the potentiometer. Note: On some newer models, the potentiometer is soldered to the printed circuit board, requiring the replacement of the armrest control board.

5. 5

   Recalibrate

   After installing the new part, turn the key switch to the ON position, enter the calibration menu within the first 10 seconds, and recalibrate the hitch.