New Holland NH 1059 – XCM (Multi-function Control Module) / ARM / EDC: 5 volt reference Open circuit ( not used )

The "(not used)" designation indicates that this specific reference circuit or pin is either unassigned in the controller's software or physically not utilized in your machine's specific configuration. When it triggers, it usually points to a ghost code, a software glitch, or a wiring harness issue (like moisture bridging pins) that tricks the controller into sensing an open circuit on an unused pin.

• T5 series
• T5.95
• T6 series
• T7 series
• TM series
• Puma
• Farmall

1. 1

   Verify Configuration: Determine if your specific machine configuration actually utilizes Electronic Draft Control and draft load sensing pins. Because the code explicitly states '(not used)' in standard New Holland literature, it is highly likely this circuit is unpopulated on your machine.

2. 2

   Inspect for Moisture/Corrosion: Check the main chassis harness and the connectors at the XCM. Water ingress or corrosion in an unused connector port can cause the controller to falsely detect an open or shorted reference voltage.

3. 3

   Check for Ghost Codes: Determine if the code is active or stored. If it is stored and causing no operational issues, it may be a software anomaly.

1. 1

   Connect Diagnostic Tool

   Hook up your diagnostic scanner to verify the active or inactive status of code NH 1059.

2. 2

   Harness Inspection

   Locate the XCM (Multi-function Control Module). Disconnect the main harness and inspect the pins. Look specifically for bent pins, pushed-out terminals, or green corrosion.

3. 3

   Draft Pin Wiring (If Equipped)

   If your tractor does use draft load sensing pins, trace the wiring from the draft load sensors back to the XCM. Look for chafed wires or disconnected plugs that would cause an open 5V or 8V reference circuit.

4. 4

   Clean and Protect

   Clean any affected connectors with electrical contact cleaner. Apply dielectric grease to the connectors (especially to unused plugs) to seal out moisture, then reconnect them.

5. 5

   Software Update / Code Clearing

   Clear the fault code. If the code immediately returns on a machine where the circuit is definitively "not used," consult a dealer to flash the XCM with the latest software update, which often patches erroneous ghost codes.

6. 6

   Bypass/Replace

   If the draft load pins are equipped and have failed internally causing the open circuit, replace the draft sensor pin or install a draft load sensing pin elimination kit to bypass the circuit.