John Deere 003509.04 – ATC: ATC 5-Volt Sensor Supply Low Voltage

The Automatic Temperature Control (ATC) module, also known as the Roof Module, has detected that the voltage in its 5-volt sensor supply circuit has dropped below the specified threshold (e.g., below 4.59 volts). This low voltage condition disrupts the normal operation of the climate control sensors connected to the circuit, leading to inaccurate readings and potential HVAC system malfunctions.

• 8235R
• 8260R
• 8285R
• 8310R
• 8335R
• 8360R
• 8310RT
• 8335RT
• 8360RT
• 8230T
• 8330T
• 8430T
• 9230
• 9330
• 9430
• 9530
• 9630
• 9470RT
• 9520RT
• 9570RT

1. 1

   Inspect the battery and charging system to ensure they are functioning correctly and providing stable voltage to the machine's electrical systems.

2. 2

   Perform a general inspection of the air conditioning system, including checking the cleanliness of the condenser at the front of the tractor and ensuring the cab's recirculation air filter is not plugged.

3. 3

   Visually inspect the wiring harnesses leading to the ATC module and each associated sensor (Water Valve Position, Evaporator Temp, Outlet Air Temp, Ambient Temp, Cab Temp, Refrigerant Pressure) for chafing, pinching, corrosion, or loose connections.

4. 4

   Disconnect the sensors on the 5-volt circuit one by one. After disconnecting each sensor, clear the fault codes and check if the 003509.04 code returns. If the code disappears, that sensor is likely the cause of the issue.

5. 5

   Test any suspect sensors with a multimeter. For temperature sensors, measure the resistance across the terminals relative to ambient temperature.

1. 1

   Ensure safety

   Lower all equipment to the ground, stop the engine, and disconnect the battery ground strap before beginning any repair.

2. 2

   Replace faulty sensor

   If a specific sensor is identified as the cause, disconnect its electrical connector, unscrew the old sensor, and install the new one, ensuring any necessary seals are in place.

3. 3

   Repair damaged wiring

   If the wiring harness is found to be damaged, repair the individual wires or replace the affected section of the harness.

4. 4

   Replace ATC module

   If all sensors and wiring have been checked and are in good condition, the ATC module itself may be at fault and will need to be replaced.

5. 5

   Reassemble and test

   After replacing the faulty component, reconnect the battery, start the machine, verify that the fault code does not reappear, and test the functionality of the climate control system.