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Circuit/System Verification

WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, cover the sunload sensor assembly with a shop towel or other suitable item. Verify the scan tool Right Sunload Sensor and Left Sunload Sensor parameters are within 3 counts of each other.
    • If not within the specified range, refer to Sunload Sensor Circuit Malfunction.
  2. Measure actual outside air temperature using a thermometer. Compare this value to the scan tool Outside Air Temp. Raw parameter. The measured temperature should be within 5 degrees of parameter.
    • If not within the specified range, refer to Circuit/System Testing  for Evaporator and Ambient Air Temperature Sensor Circuit Malfunction.
  3. Measure actual inside air temperature using a thermometer. Compare this value to the scan tool Inside Air Temp. parameter. The measured temperature should be within 5 degrees of parameter.
    • If not within the specified range, refer to Circuit/System Testing  for Inside Air Temperature Sensor Circuit Malfunction.
  4. Measure actual evaporator air temperature using a thermometer. Compare this value to the scan tool A/C Evap. Temperature Sensor parameter. The measured temperature should be within 5 degrees of the parameter.
    • If not within the specified range, refer to Circuit/System Testing  for Evaporator and Ambient Air Temperature Sensor Circuit Malfunction.
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