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Sun Load Sensor Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector at the Sunload Sensor.
  2. Test for less than 1.0 ohm of resistance between the ground circuit terminal C and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the appropriate scan tool Sunload Sensor parameter is greater than 4.9 volts or 250 counts.
    • If less than the specified range test the appropriate signal circuit terminal A or B for a short to ground. If the circuit tests normal, replace the HVAC control module.
  4. Install a 3 -amp fused jumper wire between the appropriate signal circuit terminal A or B and the ground circuit terminal C. Verify the scan tool Sunload Sensor parameter is less than the 0.1 volt or 5 counts.
    • If greater than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the HVAC control module.
  5. If all circuits test normal, test or replace the sunload sensor.
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