New Holland ARMRE 18048 – Armrest Module (ARU - Arm Rest Unit): EHR 4 lever position - voltage too high

The signal voltage coming from the internal potentiometer of the 4th remote valve control lever on the armrest is exceeding the maximum allowable limit. This typically points to a short to power on the signal wire, an open ground circuit, or a complete internal failure of the lever's potentiometer.

• T6 Series
• T7 Series
• T8 Series
• T9 Series

1. 1

   Remove the armrest cover and visually inspect the wiring harness and connector at the EHR 4 lever for corrosion, backed-out pins, or chafed wires.

2. 2

   Test the ground circuit to the lever (an open ground will cause the signal voltage to default high).

3. 3

   Test the signal wire for a short to a 12V or 5V power source.

4. 4

   Use the tractor's onboard H-Menu diagnostic system (H9 menu) or the CNH Electronic Service Tool (EST) to monitor the live voltage of the EHR 4 lever. If the voltage reads high and does not change smoothly when physically moving the lever, the internal potentiometer has failed.

1. 1

   Power down and disconnect battery

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

2. 2

   Disassemble armrest console

   Disassemble the right-hand armrest control console to access the underside of the remote valve control levers.

3. 3

   Disconnect electrical connector

   Disconnect the electrical connector from the faulty EHR 4 lever.

4. 4

   Remove retaining screws

   Remove the retaining screws securing the EHR 4 lever assembly to the armrest housing.

5. 5

   Install replacement lever

   Install the replacement control lever and secure it with the screws.

6. 6

   Reconnect and reassemble

   Reconnect the electrical connector and reassemble the armrest console.

7. 7

   Perform lever calibration

   Perform a lever calibration through the A-post instrument cluster display or the CNH EST software. This allows the Armrest Module to learn the new minimum, maximum, and neutral voltage positions of the new lever. The remotes will not function correctly until this calibration is completed.