B3820

DTC B3819, B3820, B3822, or B3823

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* 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

When the body control module (BCM) receives a command to operate the appropriate rear window UP or DOWN from the driver door switch (DDS), it will send a signal to the appropriate rear window switch to command the window UP or DOWN.

Conditions for Running the DTC

Battery voltage is between 9-16 volts.

Conditions for Setting the DTC

B3819 00

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

B3820 00

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

B3822 00

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

B3823 00

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.

Circuit/System Verification

Command the appropriate rear door window UP and DOWN with a scan tool. The rear door window should go UP and DOWN as commanded.

If the LR or RR window sets B3819 00 or B3822 00 during the UP command, refer to B3819 00 or B3822 00 B3819
If the LR or RR window sets B3820 00 or B3823 00 during the DOWN command, refer to B3820 00 or B3823 00 B3820

Circuit/System Testing

B3819 00 or B3822 00

1. Ignition OFF, disconnect the harness connector at the appropriate rear window switch.
2. Ignition ON, test for 0 volts between the power window switch rear up signal circuit terminal B and ground

^ If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.

3. Test for more than 10 volts between the power window switch rear up signal circuit terminal B 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.

4. If the circuit tests normal, replace the rear window switch.

B3820 00 or B3823 00

1. Ignition OFF, disconnect the harness connector at the appropriate rear window switch.
2. Ignition ON, test for 0 volts between the power window switch rear down signal circuit terminal C and ground.

^ If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.

3. Test for more than 10 volts between the power window switch rear down signal circuit terminal C 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 the circuit tests normal, replace the rear window switch.

Repair Instructions

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

* Rear Side Door Window Switch Replacement