Chevrolet Silverado / GMC Sierra. Manual — part 2962
window in the UP or DOWN direction.
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.
Reference Information
Schematic Reference
Moveable Window Schematics
Connector End View Reference
Component Connector End Views
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
Description and Operation
Power Windows Description and Operation
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Scan Tool Reference
Control Module References 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.
If the LR or RR window sets B3819 00 or B3822 00 during the UP command, refer to
B3819 00 or B3822 00
If the LR or RR window sets B3820 00 or B3823 00 during the DOWN command, refer to
B3820 00 or B3823 00
Circuit/System Testing
B3819 00 or B3822 00
1. Ignition OFF, disconnect the harness connector at the appropriate rear window switch.
2. 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.
3. 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. Test for more than 10 volts between the power window switch rear down signal circuit
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
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.
3. If the circuit tests normal, replace the rear window switch.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Rear Side Door Window Switch Replacement (Crew Cab) or Rear Side Door
Window Switch Replacement (Extended Cab)
Control Module References for BCM replacement, setup and programming
DTC B3821 OR B3824
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
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
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
Driver Door Switch B+
U0199 00
U0199 00
-
-
LR Window Switch B+
1, 3
3
-
-
Passenger Door Switch B+
U0200 00
U0200 00
-
-
RR Window Switch B+
2, 4
4
-
-
Power Window Switch Right
B3823 00
B3823 00
B3823 00
-
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
Circuit/System Description
The body control module (BCM) monitors the window lockout command from the driver door
switch (DDS). When the rear window switch operation is authorized, the the BCM signal voltage
drops approximately 5 volts to the rear window switches allowing for normal window operation
from the rear switches. If the rear window lockout function is commanded, the BCM signal
voltage is at B+ voltage which disables the rear window switches and the rear windows will only
operate when the BCM receives a command from the driver master control.
Conditions for Running the DTC
Battery voltage is between 9-16 volts.
Rear Down Signal
Power Window Switch Right
Rear Up Signal
B3822 00
B3822 00
B3822 00
-
Power Window Switch Left
Rear Down Signal
B3820 00
B3820 00
B3820 00
-
Power Window Switch Left
Rear Up Signal
B3819 00
B3819 00
B3819 00
-
Power Window Lockout Left
Rear Control
B3821 00
B3821 00
B3821 00
-
Power Window Lockout Right
Rear Control
B3824 00
B3824 00
B3824 00
-
LR Window Motor Control
3
3
3
-
Passenger Window Motor
Control
B3205 00
B3205 0B
B3205 00
-
RR Window Motor Control
4
4
4
-
Driver Window Motor
Control
B3205 00
B3205 0B
B3205 00
-
LR Window Switch Ground
-
3
3
-
RR Window Switch Ground
-
4
4
-
Driver Door Switch Ground
-
U0199 00
1
-
Passenger Door Switch
Ground
-
U0200 00
2
-
1. Driver Window Malfunction
2. Passenger Window Malfunction
3. Left Rear Window Malfunction
4. Right Rear Window Malfunction
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
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