Chevrolet Silverado / GMC Sierra. Service manual — part 2963
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
The ignition is ON.
Conditions for Setting the DTC
B3821 00
The BCM detects a fault in the left rear window lockout circuit.
B3824 00
The BCM detects a fault in the right rear window lockout circuit.
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
Connector End View Reference
Component Connector End Views
Description and Operation
Power Windows Description and Operation
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
Scan Tool Reference
Control Module References 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, with the rear window switches enabled, test for more than 10 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
3. If all circuits test 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
SYMPTOMS - FIXED AND MOVEABLE WINDOWS
1. Perform the Diagnostic System Check - Vehicle before using the Symptom Tables in
order to verify that all of the following are true:
There are no DTCs set.
The control modules can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions.
Refer to the following system descriptions:
Power Windows Description and Operation
IMPORTANT: The following steps must be completed before using the symptom
tables.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
Rear Window Defogger Description and Operation
Visual/Physical Inspection
Inspect for aftermarket devices which could affect the operation of the system. Refer to
Checking Aftermarket Accessories .
Inspect the easily accessible or visible system components for obvious damage or conditions
which could cause the symptom.
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to
Testing for Intermittent Conditions and Poor Connections .
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the
symptom:
Rear Window Defogger Malfunction
Power Windows Malfunction (A31/AN3/DL3) or Power Windows Malfunction (A31
w/o AN3, DL3)
Power Rear Sliding Window Malfunction
REAR WINDOW DEFOGGER MALFUNCTION
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.
Diagnostic Fault Information
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
Relay Switch B+
2
2
-
-
Rear Defog Relay Control
B0283 06
B0283 06
2
-
Rear Defog Relay Ground
-
B0283 06
2
-
Rear Defogger Control
2
2
1
-
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
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