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Sunload Sensor Circuit Malfunction

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the sunload sensor.
  2. Ignition OFF, test for less than 10 ohms of resistance between the low reference circuit terminal C and ground.
    • If greater than the specified range, test the ground circuit for high resistance.
  3. Ignition ON, test for 4.8-5.2 volts between the low reference circuit terminal C and the appropriate signal circuit terminal.
    • Left sunload sensor circuit terminal A.
    • Right sunload sensor circuit terminal B.
    • If less than the specified range, test the signal circuit for high resistance. If the circuit tests normal, replace the HVAC control module.
  4. If all circuits test normal, test or replace the sunload sensor.
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