John Deere 524203.03 – ATC: High Voltage On Ambient Air Temp Front Beside AC Receiver Dryer

This code is triggered when the control unit measures a voltage exceeding 5 volts at the signal input for the front ambient air temperature sensor (designated as sensor B125, lead 2001). This high voltage condition typically indicates that the circuit is either shorted to a power supply lead or has an open circuit. As a result, the HVAC system receives incorrect ambient temperature data, which can lead to inappropriate climate control settings and reduced cabin comfort.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6M Series
• 6230
• 6330
• 6430
• 9230
• 9330
• 9430
• 9530
• 9630
• E360
• E360LC

1. 1

   Inspect the wiring harness at lead 2001 (connecting to the B125 sensor at the front beside the AC receiver dryer) for any signs of damage, wear, corrosion, or improper connections.

2. 2

   Use a multimeter to verify the voltage at the sensor's signal input. A reading above 5 volts confirms the presence of the electrical fault.

3. 3

   Check the circuit specifically for a short to a power supply lead or an open connection.

1. 1

   Isolate the fault

   Based on the multimeter readings, locate the exact point of the short to power or the open connection within the circuit.

2. 2

   Repair wiring

   Repair or replace any damaged wires or connectors in the harness leading to the B125 sensor.

3. 3

   Replace sensor

   If the wiring harness tests perfectly and the voltage irregularity is internal to the sensor, replace the front ambient air temperature sensor.

4. 4

   Test functionality

   After repairs are made, turn the system on and test the ambient air temperature sensor to ensure it accurately measures and reports temperatures to the ATC/ETC.

5. 5

   Clear codes

   Connect a compatible diagnostic tool (such as John Deere Service Advisor) to the tractor's diagnostic port, read the current codes, and clear the stored 524203.03 fault code.

6. 6

   Verify operation

   Perform a comprehensive functional test of the HVAC system to ensure it operates correctly under normal conditions.