John Deere 524096.02 – AIC (Armrest Interface Control Unit): Armrest Engine Speed Control Module Message Fault / Hand Throttle Potentiometer, Voltage Ratio Between Channel 1 and Channel 2 Not Correct

There is a communication fault between the Armrest Interface Control software and the engine speed control module (hand throttle). The controller is either receiving a faulty LIN message from the module, or it detects a mismatch in the dual-channel signal voltages coming from the hand throttle potentiometer, causing the hand throttle function to be disabled or restricted.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 8225R
• 8245R
• 8270R
• 8295R
• 8320R
• 8335R
• 8345R
• 8370R
• 8400R
• 9510R
• 9470RT
• 9520RT
• 9570RT
• 6090MC
• 6100MC
• 6110MC
• 6090RC
• 6100RC
• 6110RC

1. 1

   Power cycle the tractor's ignition to see if the fault is a transient glitch that clears upon a system reboot.

2. 2

   Inspect the LIN Bus system wiring harness between the AIC and the hand throttle/engine speed control module for physical damage, pinched wires, or disconnections.

3. 3

   Check the connectors at the hand throttle potentiometer for corrosion, loose pins, or moisture ingress that could interfere with signal transmission.

4. 4

   Use a multimeter to verify that the engine speed control module is receiving proper power and ground.

5. 5

   Check the voltage ratio between Channel 1 and Channel 2 of the hand throttle potentiometer to confirm if the sensor itself has failed.

1. 1

   Disconnect Power

   Disconnect the tractor's battery to prevent electrical shorts during the repair.

2. 2

   Access the Armrest Console

   Carefully disassemble the armrest control console to access the internal wiring and the hand throttle assembly.

3. 3

   Repair Wiring

   If the diagnostic checks revealed damaged wiring or corroded connectors on the LIN Bus circuit, repair the wiring or replace the connector pigtail.

4. 4

   Replace the Potentiometer/Module

   If the wiring is intact but the potentiometer failed the voltage ratio test (or is not sending LIN messages), remove the retaining screws/clips holding the hand throttle potentiometer or the armrest engine speed control module. Install the new OEM replacement part.

5. 5

   Reassembly

   Reconnect the wiring harness to the new module and reassemble the armrest console.

6. 6

   System Reset and Test

   Reconnect the battery. Turn the key on and use a diagnostic tool (or the tractor's CommandCenter display) to clear the fault codes. Perform a test run, operating the hand throttle through its full range of motion to ensure the AIC is successfully receiving the correct messages and the fault does not return.