2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 457
parameter value.
瀚慖f not within the specified range, replace the B160 Windshield Temperature and Inside Moisture Sensor.
6. Measure actual temperature using a thermometer at the windshield temperature and inside moisture sensor. Compare this value to the scan
tool Windshield 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 B160 Windshield Temperature and Inside Moisture Sensor.
Circuit/System Testing
Windshield Temperature and Inside Moisture Sensor Power Supply Malfunction
1. Ignition OFF, disconnect the harness connector at the B160 Windshield Temperature and Inside Moisture Sensor.
2. Test for less than 10 ohm between the ground circuit terminal 3 and ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, test for 4.8-5.2 V between the ground circuit terminal 3 and the reference voltage circuit terminal 1.
瀚慖f less than the specified range, test the reference voltage 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 reference voltage 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 B160 Windshield Temperature and Inside Moisture Sensor.
Humidity Sensor Humidity Circuit Malfunction
1. Ignition OFF, disconnect the harness connector at the B160 Windshield Temperature and Inside Moisture Sensor.
2. Test for 4.8-5.2 V between the signal circuit terminal 2 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 B160 Windshield Temperature and Inside Moisture Sensor.
Humidity Sensor Temperature Circuit Malfunction
1. Ignition OFF, disconnect the harness connector at the B160 Windshield Temperature and Inside Moisture Sensor.
2. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 5 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 B160 Windshield Temperature and Inside Moisture Sensor and verify the DTC does not reset.
Windshield Temperature Sensor Circuit Malfunction
1. Ignition OFF, disconnect the harness connector at the B160 Windshield Temperature and Inside Moisture 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 B160 Windshield Temperature and Inside Moisture Sensor and verify the DTC does not reset.
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
programming
Lighting
DTC B1405, B1529, or B257B
