2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 775

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 775

Replacement)

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

B3823

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