Monday, May 24, 2021

2010 Cadillac Truck SRX FWD V6-3.0L Page 149

2010 Cadillac Truck SRX FWD V6-3.0L Page 149



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 B018A 02



- Windshield Temperature Sensor Circuit Short to Ground



DTC B018A 05



- Windshield Temperature Sensor Circuit High Voltage/Open



DTC B048C 02



- Humidity Sensor Humidity Circuit Short to Ground



DTC B048C 05



- Humidity Sensor Humidity Circuit High Voltage/Open



DTC B048F 02



- Humidity Sensor Temperature Circuit Short to Ground



DTC B048F 05



- Humidity Sensor Temperature Circuit High Voltage/Open



DTC B1395 03



- Control Module Voltage Reference Output Circuit Low Voltage



DTC B1395 07



- Control Module Voltage Reference Output Circuit High Voltage



Circuit/System Description



The windshield temperature and inside moisture sensor includes the relative humidity sensor, windshield temperature sensor and humidity sensing



element temperature sensor.



This sensor assembly provides information about:



* Relative humidity level at windshield inside



* Temperature of the windshield inside



* Temperature of the humidity sensor element



The relative humidity sensor measures the relative humidity of the compartment side of the windshield. It also detects the temperature of the



windshield surface on the compartment side. Both values are used as control inputs for the HVAC control module application to calculate the fog



risk on windshield compartment side and ability to reduce fuel consumption by decreasing A/C compressor power to a minimum without causing



any fog. The sensor will also enable partial recirculation mode in order to improve heat-up performance of the passenger compartment under cold



ambient temperature conditions without the risk of mist build-up on the windshield. The humidity sensor element temperature sensor supplies the



temperature of the humidity sensor element. It is only needed if the thermal contact between the humidity sensing element and the inside windshield



surface is not sufficient.



Conditions for Running the DTC



* Ignition ON.



* The HVAC control module is ON.



Conditions for Setting the DTC



B018A 02, B048C 02, B048C 02 or B1395 03



The HVAC control module detects the sensor signal out of range. The signal voltage is less than 0.1 V for more than 50 ms.



B018A 05, B048C 05, B048C 05 or B1395 07



The HVAC control module detects the sensor signal out of range. The signal voltage is greater than 4.9 V for more than 50 ms.



Action Taken When the DTC Sets



* The system will use the last valid values as default.



* If no value is read at the time of fault, the HVAC control module uses 60% for humidity.

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