Wednesday, July 17, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 683


B3819



DTC B3819, B3820, B3822, or B3823



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 B3819 00



- Left Rear Window Up Control Circuit



DTC B3820 00



- Left Rear Window Down Control Circuit



DTC B3822 00



- Right Rear Window Up Control Circuit



DTC B3823 00



- Right Rear Window Down Control Circuit



Diagnostic Fault Information



Circuit/System Description



The body control module (BCM) monitors the window UP/DOWN command from the driver door switch (DDS). When the rear window UP or



DOWN command is received, the BCM sends a signal to the appropriate rear window switch. The rear window switches continuously monitor the



up and down signal circuits, if no function is being commanded, the signal voltage is at approximately B+ voltage. If the UP or DOWN function is



commanded, the BCM signal voltage drops approximately 0.5 volts and the appropriate rear window switch will then command the window in the



UP or DOWN direction.



Conditions for Running the DTC

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