2010 Cadillac Truck SRX AWD V6-3.0L Page 383
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掳C (9掳F) difference of appropriate Duct Actual parameter value.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.
2. Test for less than 10 ohm between the temperature sensor ground circuit terminal B and ground.
瀚慖f greater than the specified value, 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 4.8-5.2 V between the signal circuit terminal A and ground.
瀚慖f less than the specified range, test the signal circuit 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 for a short to voltage. If the circuit tests normal, replace the K33 HVAC Control
Module.
4. If all circuits test normal, replace the temperature 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)
B0519
DTC B0173, B0178, B0509, B0514, B0519, B3583, or B3933
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B0173 02
- Upper Left Duct Air Temperature Sensor Circuit Short to Ground
DTC B0173 05
- Upper Left Duct Air Temperature Sensor Circuit High Voltage/Open
DTC B0178 02
- Lower Left Duct Air Temperature Sensor Circuit Short to Ground
DTC B0178 05
- Lower Left Duct Air Temperature Sensor Circuit High Voltage/Open
DTC B0509 02
- Upper Right Duct Air Temperature Sensor Circuit Short to Ground
DTC B0509 05
- Upper Right Duct Air Temperature Sensor Circuit High Voltage/Open
DTC B0514 02
- Lower Right Duct Air Temperature Sensor Circuit Short to Ground
DTC B0514 05
- Lower Right Duct Air Temperature Sensor Circuit High Voltage/Open
DTC B0519 02
- Rear Upper Duct Air Temperature Sensor Circuit Short to Ground
