2010 Cadillac CTS Sedan AWD V6-3.6L Page 646
If any switch position is not within the specified range, replace the turn signal multifunction switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* 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
B3933
DTC B3933
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 Descriptor
DTC B3933 06
- Evaporator Air Temperature Sensor Short to Ground or Open
Diagnostic Fault Information
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
Ignition 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 10 seconds.
Action Taken When the DTC Sets
The A/C compressor will be disabled and the A/C ON LED is turned off. The DIC will display Service A/C System to notify the driver.
Conditions for Clearing the DTC
