Case IH 2873-07 - BCM – BCM: CAN main light switch - switch error

Indicates a malfunction, signal error, or communication failure originating from the CAN-based field/main light switch.

• MAGNUM AFS Connect
• Magnum 400 AFS Connect
• Magnum 180-380
• Steiger

1. 1

   Inspect the physical condition of the CAN field light switch on the cab console for sticking buttons or physical damage

2. 2

   Inspect the wiring harness and connectors between the field light switch and the BCM for corroded pins, loose connections, opens, or shorts to ground/power

3. 3

   Check if the BCM is logging other CAN communication fault codes (if multiple CAN codes are present, the issue may be a broader CAN bus wiring problem rather than an isolated switch failure)

1. 1

   Turn off the ignition and disconnect the battery

   to prevent electrical shorts.

2. 2

   Carefully pry up or remove the console trim panel

   to access the rear of the field light switch.

3. 3

   Disconnect the electrical connector

   from the faulty CAN field light switch.

4. 4

   Depress the retaining tabs on the switch body

   and push it out of the console bezel.

5. 5

   Snap the new OEM light switch into the console

   and reconnect the wiring harness.

6. 6

   Reinstall the console trim

   and reconnect the battery.

7. 7

   Clear the BCM fault codes using a diagnostic tool

   and test the field lights in all positions to verify the repair.