2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 800

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 800

* 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掳C (-38掳F) or more than 215掳C (419掳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