Case IH 518434-14 - ACM – ACM: Incorrect multi function handle keypad configuration

The control module has detected a mismatch between the software configuration for the MultiFunction Handle (MFH) keypad and the physical hardware installed, or it is receiving unexpected parameters from the keypad on the CAN bus.

• MAGNUM AFS Connect
• Case IH Magnum AFS Connect Series (models 250, 280, 310, 340, 380, 400, and Rowtrac variants)
• Case IH Steiger & Quadtrac AFS Connect Series
• Case IH Patriot 50 Series Sprayers

1. 1

   Check for related active ACM fault codes (such as 518434-19 or 518434-13) which could point to a physical connection failure rather than a configuration error

2. 2

   Verify the current ACM configuration using the Case IH Electronic Service Tool (EST) to ensure software settings match the physical hardware options installed

3. 3

   Inspect the wiring harness and connectors between the MultiFunction Handle and the Armrest Control Module (ACM) for damaged wires, loose pins, or corrosion

1. 1

   Connect diagnostic tool

   Connect the Case IH Electronic Service Tool (EST) to the machine's CAN1/ISOBUS diagnostic connector.

2. 2

   Navigate software

   Open the EST software, select the "Configuration" item in the toolbar, and navigate to "General Configuration".

3. 3

   Review configuration

   Access the ACM (Armrest Control Module) settings and review the MultiFunction Handle keypad configuration.

4. 4

   Reconfigure settings

   Reconfigure the keypad options to correctly match the installed equipment and save the configuration to the ACM.

5. 5

   Inspect and clean connector

   If the configuration was already correct, disconnect the MultiFunction Handle, inspect the connector pins for damage, clean them, and reconnect.

6. 6

   Replace component

   If the fault persists after verifying the wiring and configuration, the internal circuitry of the MultiFunction Handle has likely failed and the handle must be replaced.

7. 7

   Clear codes and test

   Clear the error codes using the EST, cycle the key, and test the programmable hot key buttons on the handle to ensure normal operation.