Case IH 10024 – Front Suspension (UCM/VCM or ICU): 12VF1 voltage supply is low. (possible blown fuse*)

The control module is detecting that the voltage on the 12VF1 power input circuit has dropped below the normal operating threshold. The system explicitly flags this as a likely blown fuse on the power supply line.

• Magnum
• Case IH Magnum 235 - 340 (Series 4)
• Case IH Steiger Series

1. 1

   Locate the main fuse and relay panel behind the operator's seat by removing the rubber liner and tray.

2. 2

   Identify the 12VF1 fuse, usually located in Block 2B, position F-053 (labeled UCM/VCM +12VF1) on Magnum models.

3. 3

   Pull the fuse and check for a blown filament, using a multimeter to check for continuity.

4. 4

   If the fuse is blown, inspect the wiring harness on the 12VF1 circuit for chafed wires or shorts to ground before replacing it.

5. 5

   Check the UCM/VCM connectors to ensure they are tight, undamaged, and that the pins are seated in the correct positions.

1. 1

   Turn off the tractor and remove the key to de-energize the cab circuits.

2. 2

   Remove the rubber liner and tray behind the operator's seat to expose the fuse and relay panel.

3. 3

   Locate fuse F-053 (5A) in Block 2B.

4. 4

   If the fuse is blown, repair any exposed or shorted wiring found during your diagnostic checks on the front suspension harness.

5. 5

   Install a new 5A fuse into the F-053 slot.

6. 6

   If the fuse was not blown, use a multimeter to measure the voltage at the fuse terminal and at the UCM/VCM power input pin to trace where the voltage drop is occurring.

   Repair the damaged wire or connector causing the open circuit.

7. 7

   Turn the key on. If the fault code is no longer present, return the machine to proper operation.