John Deere 001553.03 – ATC: Blower Control Circuit Voltage Problem

The ClimaTrak™ automatic temperature control (ATC) system has detected an abnormal voltage reading (either too high or too low) or an open or shorted circuit related to the fan speed control.

• 6020
• 6120
• 6220
• 6320
• 6420
• 6420S
• 7715
• 7815

1. 1

   Inspect the condenser at the front of the tractor for cleanliness and ensure the cab recirculation air filter is not plugged

2. 2

   Visually inspect for any signs of damage or dirt around the blower motor and its electrical connections

3. 3

   Note and clear active and stored diagnostic trouble codes, operate the blower fan, and check for codes again to ensure the fault is current

1. 1

   Access ATC diagnostics

   On the tractor's digital display, access the stored diagnostic trouble codes to confirm that ATC 001553.03 is present.

2. 2

   Inspect blower motor and wiring

   Gain access to the main cab blower motor and its associated wiring. Visually inspect the wiring harness for any signs of damage, such as chafing, breaks, or corrosion on the connectors.

3. 3

   Perform circuit/harness test

   Check for continuity, shorts to ground, and shorts to power in the wiring between the ATC controller and the blower motor (Fan Motor Driver Unit A59). This determines if the fault lies with the wiring or the motor itself.

4. 4

   Test blower motor functionality

   If the wiring is found to be in good condition, test the blower motor by applying a known good 12V power source directly to its terminals to see if it operates correctly.

5. 5

   Replace the blower motor

   If the blower motor is found to be faulty during testing, replace it with a new unit.