2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 462
Circuit/System Verification
1. Verify that DTC B1405 02 or B1405 05 is not set.
瀚慖f DTC is present, refer to Ambient Light/Sunload Sensor Power Supply Malfunction.
2. Verify that DTC B0163 02 or B0163 05 is not set.
瀚慖f DTC is present, refer to Passenger Compartment Temperature Sensor Circuit Malfunction.
3. Verify that DTC B0183 02 or B0183 05 is not set.
瀚慖f DTC is present, refer to Sunload Sensor Circuit Malfunction.
4. Measure actual inside air temperature using a thermometer. Compare this value to the scan tool Passenger Compartment Air Temperature
parameter. The measured temperature should be within 5掳C (9掳F) difference of parameter value.
瀚慖f not within the specified range, replace the B10B Ambient Light/Sunload Sensor.
Circuit/System Testing
Ambient Light/Sunload Sensor Power Supply Malfunction
1. Ignition OFF, disconnect the harness connector at the B10B Ambient Light/Sunload Sensor.
2. Test for less than 10 ohm between the B10B Ambient Light/Sunload Sensor ground circuit terminal 6 and ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the K33 HVAC
Control Module.
3. Ignition ON, test for battery voltage between the reference voltage circuit terminal 2 and ground.
瀚慖f greater than the specified range, test the reference voltage circuit for an open or short to ground. If the circuit tests normal, replace the
K33 HVAC Control Module.
4. If all circuits test normal, replace the B10B Ambient Light/Sunload Sensor.
Passenger Compartment Temperature Sensor Circuit Malfunction
1. Ignition OFF, disconnect the harness connector at the B10B Ambient Light/Sunload Sensor.
2. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 3 and ground.
瀚慖f less than the specified range, test the signal circuit terminal for a short to ground or open/high resistance. If the circuit tests normal,
replace the K33 HVAC Control Module.
瀚慖f greater than the specified range, test the signal circuit terminal for a short to battery. If the circuit tests normal, replace the K33 HVAC
Control Module.
3. If all circuits test normal, replace the B10B Ambient Light/Sunload Sensor.
Sunload Sensor Circuit Malfunction
1. Ignition OFF, disconnect the harness connector at the B10B Ambient Light/Sunload Sensor.
2. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 4 and ground.
瀚慖f less than the specified range, test the signal circuit terminal for a short to ground or open/high resistance. If the circuit tests normal,
replace the K33 HVAC Control Module.
瀚慖f greater than the specified range, test the signal circuit terminal for a short to battery. If the circuit tests normal, replace the K33 HVAC
Control Module.
3. If all circuits test normal, replace the B10B Ambient Light/Sunload Sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* HVAC Component Replacement Reference (See: Heating and Air Conditioning/Service and Repair/Removal and Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for HVAC control module replacement, setup, and
