B3820

DTC B3819, B3820, B3822, or B3823

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptors
DTC B3819
- Left Rear Window Up Control Circuit

DTC B3820
- Left Rear Window Down Control Circuit

DTC B3822
- Right Rear Window Up Control Circuit

DTC B3823
- Right Rear Window Down Control Circuit

Diagnostic Fault Information





Circuit/System Description

The rear passenger power windows can also be operated from the DDS through a serial data message to the BCM. The rear passenger window switches on the DDS have 2 positions, up and down, their position is a direct input into the DDS. When the BCM receives a command to operate a rear window up or down the appropriate signal circuit to the rear door window switch.

Conditions for Running the DTC

Battery voltage is between 9-16 volts.

Conditions for Setting the DTC

B3819

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

B3820

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

B3822

The BCM detects a fault in the right rear window up circuit.

B3823

The BCM detects a fault in the right rear window down circuit.

Action Taken When the DTC Sets

The left or right rear power window will be inoperative from the driver master control.

Conditions for Clearing the DTC

* The DTC will be current for as long as the fault is present.
* When the fault is no longer present, the DTC will be a history DTC.
* A history DTC will clear after 50 ignition cycles.

Reference Information
Schematic Reference

Moveable Window Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Power Windows Description and Operation (Power Windows Description and Operation)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

Command the appropriate rear door window UP and DOWN with a scan tool. The rear door window should perform the UP and DOWN function.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate rear window switch.
2. Ignition ON, test for greater than 9 volts between the signal circuit terminal C and ground while commanding the rear window UP with a scan tool.

• If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.

3. Test for greater than 9 volts between the signal circuit terminal B and ground while commanding the rear window DOWN with a scan tool.

• If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.

4. If all circuits test normal, replace the rear window switch.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Rear Side Door Window Switch Replacement (Rear Side Door Window Switch Replacement)
* Control Module References (Programming and Relearning) for BCM replacement, setup and programming