Case IH 518050-02 - ACM – ACM: Manual differential lock switch circuit fault

Electrical circuit malfunction, such as an open circuit, short circuit, or disconnection, specifically tied to the manual differential lock switch or its wiring harness.

• MAGNUM AFS Connect

1. 1

   Inspect the differential lock keypad and switch connections on the armrest to verify plug security.

2. 2

   Test the switch circuits for continuity and shorts using insulated tools.

3. 3

   Inspect the specific wiring harness leads going to the switch, looking for damage on the differential lock switch signal wire (black/light blue) and the ground wire (black).

1. 1

   Power down tractor

   Power down the tractor and access the Armrest Control Module (ACM) console.

2. 2

   Disconnect harness

   Disconnect the wiring harness plug from the manual differential lock switch.

3. 3

   Remove switch

   Remove the switch from its holder/bezel.

4. 4

   Replace or repair

   Replace the faulty switch (or repair the damaged black/light blue or black wires in the harness).

5. 5

   Reconnect and verify

   Reconnect the harness, power on the tractor, and clear the stored fault codes from the ACM to verify the repair.