Circuit/System Verification
WARNING: This page is about a different car, the 2010 Cadillac SRX. 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 DTC B0193 .
- Ignition ON, place the auxiliary blower motor switch in each speed position. Verify that the auxiliary blower motor operates properly in each position.
- If the auxiliary blower motor does not operate properly in all speeds, refer to DTC B0208 .
- Using the scan tool observe the mode, temperature, air inlet 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 B0223, B022A, B0233, B023A, B0408, B0418, B0428, or B3531
- Engine ON, A/C ON, place the temperature control in the coldest position. Verify that cool air flows from the ducts in the vehicle.
- If the air is not cool, refer to Air Conditioning (A/C) System Performance Test (LF1) or Air Conditioning (A/C) System Performance Test (LAU)
- 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 Sunload Sensor parameter changes.
- If it does not change, refer to Circuit/System Testing DTC B0163, B0183, or B1405 .
- Measure actual inside air temperature using a thermometer. Compare this value to the scan tool Inside Passenger Compartment Air Temp. Sensor parameter. The measured temperature should be within 5 degrees of parameter.
- If not within the specified range, refer to Circuit/System Testing DTC B0163, B0183, or B1405 .
- Measure actual temperature using a thermometer at each of the duct temperature sensors. Compare this value to the appropriate scan tool Duct parameter. The measured temperature should be within 5 degrees of appropriate Duct Temperature Sensor parameter.
- If not within the specified range, refer to Circuit/System Testing DTC B0173, B0178, B0509, B0514, B0519, B3583, or B3933 .
- Ignition ON, observe the scan tool A/C Evaporator Temperature Sensor parameter. The reading should be between -39°F (-35°C) and 185°F (85°C) and change with evaporator air temperature changes.
- If not within the specified range, refer to Circuit/System Testing DTC B0173, B0178, B0509, B0514, B0519, B3583, or B3933 .