Case IH 18400 – Armrest Control Module (ACM) or ICP (Intuitive Control Panel): EHR 1 Program / Motor Mode Switch ("EHR_Mode_1Sw") Error

The CAN signal broadcasted from the ICP regarding the position or state of the EHR 1 switch is missing, out of range, or in a recognized error state. This means the tractor's computer cannot determine the commanded position of the #1 remote valve or hitch program switch.

• VESTRUM CVX
• Case IH Steiger & Quadtrac Series (e.g., 350, 370, 400, 450, 500, 540, 600, 620)
• Case IH Magnum Series (e.g., 235–340, CVX)
• Case IH Puma Series (e.g., 140–240, 150, 160, 170)
• Case IH Optum Series
• Case IH Maxxum Series

1. 1

   Verify CAN Communication: Check if other buttons and dials on the ICP are functioning. If multiple switches are unresponsive, the entire ICP may have lost CAN communication or power/ground.

2. 2

   EST Monitoring: Connect the Case IH Electronic Service Tool (EST). Navigate to the Armrest/ICP configurations (e.g., Config B/b 6.7) and monitor the live data for the "EHR 1 motor/program switch". Toggle the switch physically to see if the state changes in the software.

3. 3

   Physical Inspection: Inspect the EHR 1 switch on the armrest for physical damage, sticking, or liquid intrusion (a common issue in open-cab or dirty environments).

4. 4

   Harness Check: Lift the armrest console and inspect the wiring harness connecting the ICP to the main armrest harness for pinched wires, corrosion, or loose connector pins.

1. 1

   Power Down

   Turn off the tractor and disconnect the battery to prevent electrical shorts while servicing the armrest CAN bus components.

2. 2

   Access the ICP

   Remove the retaining screws on the underside or perimeter of the Multicontroller armrest to lift the top cover and access the Integrated Control Panel.

3. 3

   Isolate the Switch

   Locate the EHR 1 switch assembly. Depending on the specific tractor configuration, the EHR switches may be a replaceable sub-assembly (toggle switch block) or integrated directly into the ICP circuit board.

4. 4

   Replace the Component

   If the switch is modular, disconnect its sub-harness, unclip it from the bezel, and install the new switch assembly. If the switch is hard-soldered to a failed ICP board, the entire Integrated Control Panel module must be replaced.

5. 5

   Reassembly

   Reconnect all CAN bus and power harnesses. Carefully seat the ICP back into the armrest and tighten the retaining screws.

6. 6

   Calibration/Clearing

   Reconnect the battery. Use the Case IH EST to clear fault code 18400 from the fault history. Perform a functional test of the EHR 1 remote to ensure the CAN signal is broadcasting correctly and the valve responds.