Case IH 2660-09 - ACM – ACM: Joystick disconnected while powered on

The Armrest Controller Module has detected a sudden loss of communication or electrical connection with the Multi-Function Handle (joystick) while the tractor's key switch is in the ON position. This indicates an open circuit, a CAN bus communication drop, or an internal failure of the joystick itself.

• MAGNUM AFS Connect
• Steiger AFS Connect
• Puma AFS Connect
• Older generation Magnum (215-335)
• Older generation Steiger (280-535)

1. 1

   Remove the armrest trim panels and inspect the wiring harness leading from the Multi-Function Handle to the ACM. Look for pinched, chafed, or broken wires caused by the armrest's pivoting motion.

2. 2

   Disconnect the joystick harness. Inspect the connector for pushed-out pins, bent terminals, or corrosion.

3. 3

   Verify that the joystick is receiving its required 5-volt reference and a solid ground from the ACM. (Loss of the 5V reference will often trigger secondary codes).

4. 4

   Check the continuity of the communication lines (CAN High / CAN Low) between the joystick connector and the ACM.

5. 5

   Look for associated armrest codes such as 18007 (Multi-function handle switch error), 18008 (voltage too low), or 18013 (encoder position error) which can help isolate if the issue is a power loss or an internal encoder failure.

1. 1

   Power Down

   Turn off the tractor and engage the battery disconnect switch to prevent electrical spikes during repair.

2. 2

   Access the ACM

   Remove the screws securing the right-hand console/armrest cover to expose the internal wiring and the Armrest Controller Module.

3. 3

   Harness Repair (If Applicable)

   If the diagnostic tests revealed a broken wire or damaged connector pin in the armrest harness, repair the wiring using OEM-approved connectors and heat-shrink tubing. Route the harness carefully to ensure it does not bind when the armrest is adjusted.

4. 4

   Replace the Joystick (If Applicable)

   If the wiring and voltages test good, the internal circuitry of the Multi-Function Handle has failed. Unbolt the joystick assembly from the armrest console. Disconnect the main electrical plug. Install the new Multi-Function Handle and secure the mounting hardware. Plug in the electrical connector, ensuring the locking tab clicks into place.

5. 5

   Reassembly

   Reinstall the armrest covers and trim pieces.

6. 6

   Calibration

   Turn on the battery disconnect and power up the tractor. Clear the inactive 2660-09 fault code via the Pro 1200 display. You may need to perform a joystick/transmission calibration procedure through the display's diagnostic menu to sync the new handle with the ACM.