Case IH 520608-02 - ACM – Armrest Control Module (ACM): Rear hitch raise switch circuit fault

Indicates an electrical circuit malfunction (such as an open circuit, short to ground, or short to power) associated with the rear hitch raise switch located on the Multi-Function Handle (MFH).

• MAGNUM AFS Connect
• Magnum 180
• Magnum 200
• Magnum 220
• Magnum 235
• Magnum 240
• Magnum 250
• Magnum 260
• Magnum 280
• Magnum 290
• Magnum 310
• Magnum 315
• Magnum 340
• Magnum 380
• Puma 165
• Puma 180
• Puma 190
• Puma 195
• Puma 200
• Puma 205
• Puma 210
• Puma 215
• Puma 225 CVX
• Puma 230
• Steiger 400

1. 1

   Check for other Armrest Control Module (ACM) error codes. Make a note of them, clear the codes, and test the system for normal operation to see if the fault returns.

2. 2

   Use the Electronic Service Tool (EST) or the tractor's diagnostic menu to monitor input d6 (MFH - Rear hitch raise switch) to see if the ACM is recognizing the button press.

3. 3

   Inspect all Armrest Control Module and Tractor Control Unit (TCU) connectors. Ensure the connectors are fully seated, not damaged, and that the pins are in the correct position with a tight fit.

1. 1

   Clear and Retest

   Clear the stored fault codes in the ACM and operate the rear hitch raise switch. If the fault does not return, it may have been a transient voltage spike.

2. 2

   Harness Inspection

   If the fault is still present, inspect the wiring harness between the Multi-Function Handle and the Armrest Control Module for chafing, pinched wires, or corrosion.

3. 3

   Component Replacement

   Because the rear hitch raise switch is integrated into the Multi-Function Handle, a hard failure of the switch itself typically requires replacing the entire Multi-Function Handle assembly.

4. 4

   Recalibration

   After replacing the handle or the ACM, use the EST to verify the ACM configuration (Config B/b 3.6) and ensure the new handle is communicating properly on the CAN bus.