Circuit/System Verification
WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Check for bulletins before proceeding.
- Ignition ON, place the blower motor switch in each speed position. Verify that the blower motor operates properly in each position.
- If the blower motor does not operate properly in all speeds, refer to Blower Motor Malfunction .
- Using the scan tool observe the mode, temperature and recirculation door positions. Verify the actual and commanded door positions are within 4 counts of each other.
- If not within the specified range, refer to Circuit/System Testing DTC B0228, B0413, B0423, B0433, B3779, or B3782 .
- Engine ON, A/C ON, place the temperature control in the coldest position. Verify that the A/C compressor clutch engages.
- If the A/C compressor clutch does not engage, refer to Air Conditioning Compressor Malfunction .
- If the A/C compressor is engaged, but air is insufficiently cooled. Refer to Air Conditioning (A/C) System Performance Test .
- Turn the A/C OFF and place the temperature control in the warmest position.
- If the air is insufficiently heated refer to Heating Performance Diagnostic .
- Engine OFF, 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 Sun Load Sensor Circuit Malfunction.
- 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 Ambient Air Temperature Sensor Circuit Malfunction.
- Measure actual inside air temperature using a thermometer. Compare this value to the scan tool Inside Air Temp. Sensor parameter. The measured temperature should be within 5 degrees of parameter.
- If not within the specified range, refer to Inside Air Temperature Sensor Circuit Malfunction.
- Measure actual temperature using a thermometer at each of the duct temperature sensors. Compare this value to the appropriate scan tool Duct Actual parameter. The measured temperature should be within 5 degrees of appropriate Duct Actual parameter.
- If not within the specified range, refer to Duct Temperature Sensor Circuit Malfunction.
- Ignition ON, observe the scan tool A/C Evaporator Temperature Sensor parameter. The reading should be between -39°F (-35°C) and 208°F (98°C) and change with evaporator air temperature changes.
- If not within the specified range, refer to Evaporator Air Temperature Sensor Circuit Malfunction.