Massey Ferguson 10.02.11 – AIRCON: Sunlight Sensor Signal Incorrect (AIRCON)

The automatic climate control system is receiving an invalid, out-of-range, or missing signal from the sunlight sensor, which is used to automatically adjust the cab's cooling and fan speed based on the intensity of the sun.

• 7724S
• 5712SL
• 7722
• 7722S
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7726S
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 4707
• 4708
• 4709
• 4710
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626

1. 1

   Perform a visual inspection to ensure the sunlight sensor (located on the center of the dashboard or cab roof) is completely clean and unobstructed.

2. 2

   Check for water damage or moisture ingress in the control panel or the sunlight sensor itself.

3. 3

   Inspect the wiring harness and connector for the sunlight sensor for an open circuit, short circuit to ground, or short circuit to the power supply.

4. 4

   Test the sunlight sensor's resistance and voltage output using a multimeter to verify if the sensor has failed internally.

1. 1

   Turn off the tractor and disconnect the battery to prevent electrical shorts.

2. 2

   Locate the sunlight sensor on the dashboard/cab interior.

3. 3

   Carefully pry up or remove the trim cover surrounding the sensor.

4. 4

   Disconnect the wiring connector (often labeled P15 or similar for the AC sunlight sensor).

5. 5

   Remove the mounting screws or unclip the sensor assembly from its mounting bracket.

6. 6

   Install the new sunlight sensor and securely reconnect the wiring harness.

7. 7

   Reinstall the dashboard cover/trim piece.

8. 8

   Reconnect the battery, clear the fault codes using a diagnostic tool, and test the automatic air conditioning function in direct sunlight to ensure the system compensates correctly.