Case IH 522840-05 - PCM – PCM: Cellular antenna open circuit

The control module is unable to detect the cellular antenna. This "open circuit" condition typically means the antenna is unplugged, the coaxial cable is severed/pinched, or the internal circuitry of the antenna itself has failed.

• MAGNUM AFS Connect
• Case IH Magnum AFS Connect series
• Case IH Steiger AFS Connect series
• Case IH combines and sprayers equipped with AFS Connect telematics

1. 1

   Locate the PCM (Processing and Communications Module) in the cab roof or behind the operator seat.

2. 2

   Check the physical connection of the cellular antenna coaxial cable at the PCM to ensure the connector is fully seated and tightened.

3. 3

   Disconnect the antenna cable from the PCM and inspect the pins and receptacles for corrosion, moisture intrusion, or bent pins.

4. 4

   Trace the coaxial cable from the PCM to the cellular antenna on the exterior cab roof, looking for severe pinches, cuts, or chafing in the wire.

5. 5

   Temporarily connect a known-good cellular antenna to the PCM to see if the 522840-05 code changes to inactive.

1. 1

   Power Down

   Turn off the machine's key switch and disconnect battery power if required by your specific model's safety guidelines.

2. 2

   Disconnect the Antenna

   Access the PCM and unscrew the cellular antenna coaxial connector.

3. 3

   Remove the Old Antenna

   Navigate to the exterior roof mount. Depending on the antenna style (adhesive, magnetic, or bracket-mounted), carefully remove the faulty antenna and pull the wiring harness out of the cab routing channel.

4. 4

   Install the New Antenna

   Mount the replacement cellular antenna on the outside of the vehicle (ensure it is mounted at least 1 meter away from GNSS/radio antennas to prevent interference, per OEM guidelines).

5. 5

   Route the Cable

   Carefully route the new antenna cable back into the cab and down to the PCM, ensuring it is not pinched by interior trim panels.

6. 6

   Reconnect and Clear

   Connect the new antenna to the PCM. Power the machine back on, allow the PCM to boot up, and verify that fault code 522840-05 is no longer active.