Case IH F-841-12 - CGR – CGR: Receiver Hardware Fault

The Failure Mode Indicator (FMI) 12 specifically designates a "bad intelligent device or component," meaning the internal circuitry, memory, or processing hardware within the receiver has experienced a critical internal failure.

• MAGNUM AFS Connect
• STEIGER AFS Connect
• Magnum AFS Connect series tractors
• Optum series tractors
• Steiger AFS Connect tractors
• AF10 combines

1. 1

   Inspect the Vector Pro receiver dome on the cab roof for physical damage, cracks, or signs of water ingress

2. 2

   Power cycle the machine to see if the fault is a transient software glitch

3. 3

   Verify that the receiver is getting clean power and ground from the machine's harness

4. 4

   Check the J1939 CAN bus wiring by measuring the resistance across the datalink backbone (should read approximately 60 ohms, indicating both 120-ohm terminating resistors are intact)

1. 1

   Power down the machine and disconnect the battery to prevent electrical spikes.

2. 2

   Access the cab roof and disconnect the main wiring harness from the back of the Vector Pro receiver.

3. 3

   Unlatch the mounting bracket and remove the faulty Vector Pro receiver from the machine.

4. 4

   Install the replacement Vector Pro receiver onto the roof mount and secure the latch.

5. 5

   Reconnect the wiring harness.

6. 6

   Power on the machine. Access the AFS Pro 1200 display to configure the new receiver, input any necessary RTK/correction unlock codes, and verify that the F-841-12 fault has cleared and satellite tracking has resumed.