Tuesday, June 4, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 717


* Turn Signal Multifunction Switch Replacement (See: Lighting and Horns/Sensors and Switches - Lighting and Horns/Turn Signal



Switch/Service and Repair/Turn Signal Multifunction Switch Replacement)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming



HVAC - Automatic



DTC B3933



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) 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)



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) Diagnostic Procedure Instructions provides an overview of each diagnostic category.



DTC Descriptors



DTC B3933 02



- Evaporator Air Temperature Sensor Short to Ground



DTC B3933 05



- Evaporator Air Temperature Sensor Short to Battery or Open



Circuit Description



The HVAC control module supplies the evaporator air temperature sensor with a low reference circuit and 5-volt signal circuit. The HVAC control



module determines the voltage drop across the sensor, which is proportional to temperature. As the air temperature increases, the sensor resistance



decreases and the voltage signal decreases. As the air temperature decreases, the sensor resistance increases and the voltage signal increases.



Conditions for Running the DTC



The ignition is turned ON.



Conditions for Setting the DTC



The HVAC control module detects the evaporator air temperature sensor signal circuit is less than -36锟斤拷C (-38锟斤拷F) or more than 215锟斤拷C (419锟斤拷F) for



more than 15 seconds.



Action Taken When the DTC Sets



The A/C compressor will be disabled.



Conditions for Clearing the DTC



* The DTC will become history if the HVAC control module no longer detects a failure.



* The history DTC will clear after 100 fault-free ignition cycles.



Reference Information



Schematic Reference



HVAC Schematics (See: Heating and Air Conditioning/Diagrams/Electrical Diagrams/HVAC - Automatic) HVAC Schematics



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views) Component Connector End Views



Description and Operation



* Air Temperature Description and Operation (See: Heating and Air Conditioning/Description and Operation/HVAC - Automatic/Air



Temperature Description and Operation) Air Temperature Description and Operation



* Air Delivery Description and Operation (See: Heating and Air Conditioning/Description and Operation/HVAC - Automatic/Air Delivery



Description and Operation) Air Delivery Description and Operation



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing) Circuit Testing



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs) Connector Repairs

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