Case IH 18337 – ACML: Configurable Switch #2: 'PB_UserCmd2_Full_06.CfgSw_2' CAN signal from ACML - error state

The system is detecting an error state or missing signal from a user-configurable switch (Switch #2) that is routed through the ACML, indicating a Controller Area Network (CAN) communication failure.

• VESTRUM CVX
• Maxxum 135 Multicontroller (Stage V)
• Puma series

1. 1

   Verify the physical condition of Configurable Switch #2 on the armrest to ensure it is not mechanically stuck or damaged

2. 2

   Check the wiring harness and connectors between the armrest switches and the ACML for continuity, corrosion, or pin damage

3. 3

   Test the CAN bus communication lines (CAN High / CAN Low) at the ACML connector to ensure the module is properly communicating with the main vehicle ECU

4. 4

   Check the ACML ground and power supply circuits (e.g., +12V SW from IGN SW)

1. 1

   Replace switch

   Replace the faulty configurable switch if it is determined to be the point of failure.

2. 2

   Repair wiring

   Repair damaged CAN wiring in the armrest harness.

3. 3

   Replace ACML

   Replace the ACML itself if the module has failed internally and is no longer broadcasting the switch state.