Case IH 603-02 - UCM – UCM: Low voltage in the right circuit of the top of the brake switch

Indicates an electrical issue with the brake switch circuit, specifically a low voltage condition in the right circuit of the top of the brake switch.

• MAGNUM AFS Connect

1. 1

   Verify the voltage at the brake switch to confirm the low voltage condition

2. 2

   Inspect the wiring harness connecting the brake switch to the UCM for any short circuits to ground (B-) or broken wires

3. 3

   Inspect the park/brake switch for shorted or corroded contacts

1. 1

   Access the brake switch located on the brake pedal assembly.

2. 2

   Disconnect the wiring harness and use a multimeter to test the switch for continuity when the pedal is depressed and released.

3. 3

   Trace the wiring from the switch back to the UCM to locate and repair any shorts or breaks in the circuit.

4. 4

   Replace the brake switch if it fails the continuity test.

5. 5

   Clear the UCM fault codes and retest the tractor to ensure the code does not return.