Case IH 517766-02 - ACM – ACM: Worklight memory 2 switch circuit fault

The control system has detected an electrical circuit malfunction—such as an open circuit, short to ground, or short to power—originating from the secondary worklight memory switch.

• MAGNUM AFS Connect
• Magnum 310 AFS Connect
• Magnum 340 AFS Connect
• Magnum 380 AFS Connect
• Magnum 400 AFS Connect

1. 1

   Test the Worklight Memory 2 switch on the multicontroller armrest to see if it responds or feels physically broken.

2. 2

   Inspect the wiring harness and connectors linking the armrest switch panel to the Armrest Control Module (ACM) for pinched wires, corrosion, or loose terminal pins.

3. 3

   Test the switch itself for proper electrical continuity when toggled to rule out an internal switch failure.

1. 1

   Disconnect battery

   Disconnect the tractor's battery power.

2. 2

   Disassemble armrest

   Disassemble the multicontroller armrest console to access the internal switch panel and the ACM harness.

3. 3

   Repair wiring

   Repair any damaged wiring found during the diagnostic phase.

4. 4

   Replace switch or panel

   If the switch itself has failed internally, replace the individual worklight switch or the integrated armrest switch panel assembly.

5. 5

   Reassemble and clear codes

   Reassemble the armrest, restore battery power, and clear the inactive fault codes via the AFS Pro 1200 display.