Sunday, February 28, 2021

2010 Cadillac CTS Sedan AWD V6-3.6L Page 617

2010 Cadillac CTS Sedan AWD V6-3.6L Page 617



DTC B3821 or B3824



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 B3821 00



- Left Rear Window Relay Power Circuit



DTC B3824 00



- Right Rear Window Relay Power Circuit



Diagnostic Fault Information



Circuit/System Description



The body control module (BCM) monitors the window lockout command from the driver door module (DDM). When the rear window switch



operation is authorized, the BCM signal voltage drops approximately 5 volts to the rear window switches allowing for normal window operation



from the rear switches. If the rear window lockout function is commanded, the BCM signal voltage is at B+ voltage which disables the rear window



switches and the rear windows will only operate when the BCM receives a command from the driver master control.



Conditions for Running the DTC



* Battery voltage is between 9-16 volts.



* The ignition is ON.



Conditions for Setting the DTC



B3821 00



The BCM detects a fault in the left rear window lockout circuit.

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