Circuit/System Verification

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 .
Remove the shop towel and shine a flashlight on the sunload sensor assembly. 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/INSIDE AIR TEMPERATURE SENSOR CIRCUIT MALFUNCTION .
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 AMBIENT/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/EVAPORATOR TEMPERATURE SENSOR CIRCUIT MALFUNCTION .
Measure actual temperature using a thermometer at the A/C evap. temperature sensor. 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 DUCT TEMPERATURE/EVAPORATOR TEMPERATURE SENSOR CIRCUIT MALFUNCTION .