B3823

DTC B3820 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 B3820 04
- Left Rear Window Down Control Circuit

DTC B3823 04
- Right Rear Window Down Control Circuit

Circuit/System Description

The rear door windows can be raised or lowered by the appropriate rear passenger door switch or the driver window switch.

Conditions for Running the DTC

Battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

B3820 04

The left rear window down circuit is open

B3823 04

The right rear window down circuit is open.

Action Taken When the DTC Sets

* The body control module (BCM) stores the DTC to memory.
* The BCM will not attempt left/right rear window down operation.

Conditions for Clearing the DTC

A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.

Circuit/System Verification

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

Circuit/System Testing

1. Ignition OFF, disconnect the appropriate rear window switch.
2. Ignition ON, connect a test lamp between the appropriate window switch down circuit terminal C and ground.
3. Command the rear window DOWN with a scan tool. The test lamp should illuminate while commanding the DOWN state.

^ If the lamp is always OFF, test the control circuit for an open/high resistance, if the circuit tests normal, replace the BCM.

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

Repair Instructions

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

* Rear Side Door Window Switch Replacement (OUTLOOK) Rear Side Door Window Switch Replacement (Acadia) Rear Side Door Window Switch Replacement (Enclave)