New Holland NH 4194 – DU Module (Display Unit) or Armrest/EHR Controller: Rear EHR No.1 Motor Mode Switch Faulty

The controller is receiving an invalid signal, an open circuit, or a short circuit from the switch assigned to Rear Remote No. 1.

• T6000 Series
• T6010
• T6020
• T6030
• T6040
• T6050
• T6060
• T6070
• T7 Series
• T7.220
• T7.235
• T7.250
• T7.260
• T7.270
• T7000 Series
• T7030
• T7040
• T7050
• T7060
• T8 Series

1. 1

   Use the tractor's built-in diagnostic interface (H-Menu, often H9) to monitor the live state of the EHR No. 1 motor mode switch and see if the controller registers a change in state

2. 2

   Inspect the physical switch on the armrest console or Integrated Control Panel (ICP) for physical damage, sticking, or liquid intrusion

3. 3

   Disconnect the switch and test it with a multimeter for proper continuity across its positions

4. 4

   Check the wiring harness between the switch and the DU Module/Armrest controller for open circuits, chafing, or corroded connector pins

1. 1

   Power Down

   Turn off the tractor, remove the key, and disconnect the negative battery cable to prevent electrical shorts.

2. 2

   Access the Switch

   Carefully remove the retaining screws or pry the bezel on the armrest console/ICP to access the underside of the EHR control switches.

3. 3

   Disconnect

   Unplug the electrical connector specifically routed to the Rear EHR No. 1 Motor Mode switch.

4. 4

   Test/Replace

   If your diagnostic continuity test proved the switch has failed internally, remove the retaining clips or mounting nut holding the switch in the console and extract the faulty switch.

5. 5

   Install

   Insert the new OEM switch into the console and secure it.

6. 6

   Reconnect

   Plug the wiring harness back into the switch, ensuring the connector clicks and locks into place.

7. 7

   Reassemble

   Reinstall the armrest console panels and reconnect the battery.

8. 8

   Clear Codes & Calibrate

   Turn the key on. Use the tractor's diagnostic menu or a CAN-bus diagnostic tool to clear the NH 4194 fault code. Test the operation of Rear Remote No. 1 in motor mode to verify the repair.