John Deere 524103.02 – ACU (Armrest Control Unit) or AIC (Armrest Interface Control): SCV IV Control Lever Switch/Sensor Circuit Conflict

There is a discrepancy between the physical position of the Selective Control Valve IV (SCV 4) control lever switch and the sensor voltage readings, causing the System Control Computer (SCC) to automatically disable the SCV IV function.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 7185J
• 7195J
• 7205J
• 7210J
• 7225J
• 7720
• 7820
• 7920
• 8310RT
• 8335RT
• 8360RT
• 8400R
• 9230
• 9330
• 9430
• 9530
• 9630

1. 1

   Restart the engine to verify if the active Service Code reappears, as it may be a temporary communication glitch

2. 2

   Inspect the SCV IV control lever switch and the corresponding sensor for physical damage, wear, or debris

3. 3

   Check all related wiring harnesses and connections in the armrest for damage, pinched wires, or loose contacts

4. 4

   Utilize a diagnostic tool or multimeter to measure and record the voltage output at various positions of the SCV IV control lever

5. 5

   Attempt to recalibrate the SCV lever sensor and switch settings via the CommandCenter display

1. 1

   Power down and disconnect battery

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

2. 2

   Remove armrest console cover

   Remove the armrest console cover/trim to access the internal ACU/AIC control modules.

3. 3

   Locate module

   Locate the SCV IV control lever module.

4. 4

   Disconnect wiring harness

   Disconnect the electrical wiring harness from the faulty SCV IV switch/sensor assembly.

5. 5

   Remove faulty module

   Unbolt and remove the faulty SCV IV control module from the armrest bracket.

6. 6

   Install new module

   Install the new SCV control switch module and securely reconnect the wiring harness.

7. 7

   Reassemble console

   Reassemble the armrest console.

8. 8

   Reconnect battery and power on

   Reconnect the battery and power on the tractor.

9. 9

   Recalibrate SCV control lever

   Recalibrate the new SCV control lever using the tractor's diagnostic monitor so the ACU learns the new sensor's voltage parameters for the neutral, extend, retract, and float positions.