B3821
DTC B3821 or B3824
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 B3821 00
-
Left Rear Window Relay Power Circuit
DTC B3824 00
-
Right Rear Window Relay Power Circuit
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) supplies voltage to the rear window switches allowing for normal window operation from the rear switches. If the rear window lockout function is enabled, the BCM will not supply voltage to the rear window switches and the rear windows will only operate when the BCM receives a command to operate the appropriate rear window UP or DOWN from the driver door module (DDM).
Conditions for Running the DTC
* Battery voltage is between 9-16 volts.
* The ignition switch is in the ON position.
* The window lockout function is disabled.
Conditions for Setting the DTC
B3821 00
The BCM detects the left rear window lockout control circuit is shorted to ground.
B3824 00
The BCM detects the right rear window lockout circuit is shorted to ground.
Action Taken When the DTC Sets
The left or right rear power window will be inoperative.
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 (Except AXE) Moveable Window Schematics (Except AXE)Moveable Window Schematics (AXE) Moveable Window Schematics (AXE)
Connector End View Reference
Component Connector End Views A/C Compressor Clutch
Description and Operation
Power Windows Description and Operation (RPO AXC/AXE) Power Windows (RPO AXC/AXE)Power Windows Description and Operation (W/O AXC/AXE) Power Windows (W/O AXC/AXE)
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
Ignition ON, command the rear windows UP and DOWN by using the window switches on the driver master control and their respective rear window switches. The rear windows should perform the UP and DOWN function from each switch.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate rear window switch.
2. Ignition ON, verify the scan tool LR Window Enable Cmd. and RR Window Enable Cmd. parameters are On.
• If not the specified value, press the window lockout switch on the driver master control.
3. Test for greater than 9 volts between the control circuit terminal D and ground.
• If less than the specified range, test the control 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 (Acadia) Rear Side Door Window Switch Replacement (Traverse) Rear Side Door Window Switch ReplacementRear Side Door Window Switch Replacement (Enclave)
* Control Module References Programming and Relearning for BCM replacement, setup and programming