2010 Cadillac Truck SRX FWD V6-3.0L Page 151

2010 Cadillac Truck SRX FWD V6-3.0L Page 151

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

B048D

DTC B048D or B048E

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 B048D 01

- Auxiliary Heater Temperature Command Circuit Short to Battery

DTC B048D 06

- Auxiliary Heater Temperature Command Circuit Low Voltage/Open