Chevrolet Silverado / GMC Sierra. Manual — part 2967
Rear Side Door Window Regulator Motor Replacement (Extended Cab) or Rear
Side Door Window Regulator Motor Replacement (Crew Cab)
Front Side Door Window Regulator Motor Replacement
Rear Side Door Window Switch Replacement (Crew Cab) or Rear Side Door
Window Switch Replacement (Extended Cab)
Control Module References for DDS, PDS and BCM replacement, setup and
programming
POWER WINDOWS MALFUNCTION (A31 W/O AN3, DL3)
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
Driver Window Switch B+
1
1
-
-
Passenger Window Switch B+
2
2
-
-
Left Rear Window Switch B+
3
3
-
-
Right Rear Window Switch
B+
4
4
-
-
Left Rear Window Down
Signal
3
3
3
-
Left Rear Window Up Signal
3
3
3
-
Passenger Window Down
Signal
2
2
2
-
Passenger Window Up Signal
2
2
2
-
Right Rear Window Down
Signal
4
4
4
-
Right Rear Window Up Signal
4
4
4
-
Window Master Switch
Lockout Control
3, 4
3, 4
3, 4
-
Driver Window Motor
Control
1
1
1
-
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
Circuit/System Description
The power window system will operate any time the ignition is in the ACC or RUN position. The
power window system will also operate whenever the body control module (BCM) is in the
retained accessory power (RAP) mode. The driver power window switch contains individual
window switches for each of the power windows. All windows may be controlled up and down
from the driver master control. The individual passenger power window switches will only
control the up and down operation of their respective power window.
Each power window contains a reversible power window motor. The direction the window
travels is dependent upon the polarity of the supply voltage. By reversing polarity of the supply
voltage the window motor will move up or down. Each power window motor is internally circuit
breaker protected.
Battery voltage is supplied to each power window switch through the accessory voltage supply
circuit. The power window switch also receives a constant ground source. The power window
motor control circuits are connected to ground through the normally closed up and down contacts
of the power window switch. When the power switch is placed in the down position, the power
window motor down control circuit is switched to 12 volts and is applied to the down side of the
power window motor. Since the other side of the power motor is connected to ground through
Passenger Window Motor
Control
2
2
2
-
Left Rear Window Motor
Control
3
3
3
-
Right Rear Window Motor
Control
4
4
4
-
Driver Window Switch
Ground
-
1
1
-
Passenger Window Switch
Ground
-
2
2
-
Left Rear Window Switch
Ground
-
3
3
-
Right Rear Window Switch
Ground
-
4
4
-
1. Driver Power Window Malfunction
2. Front Passenger Window Malfunction
3. Left Rear Power Window Malfunction
4. Right Rear Power Window Malfunction
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
the normally closed contacts of the up switch, the window travels down. By placing the power
window switch in the up position, the polarity of the power window motor is reversed and the
window travels up.
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
Circuit/System Verification
1. Ignition ON, command the each window UP and DOWN using the appropriate window
switch on the driver master control and the appropriate passenger door window switch.
Each window should perform the UP and DOWN functions from each switch.
If the front driver door window is inoperative, refer to Driver Power Window
Inoperative below.
If the front passenger door window is inoperative, refer to Passenger Power Window
Inoperative below.
If the left rear or right rear door window is inoperative, refer to Rear Power Window
Inoperative below.
2. Disable the rear door window switches by activating the window lockout switch on the
driver master control. The rear door window switches should be inoperative.
If the rear door window switches are still active, refer to Window Lockout Switch
Malfunction below.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
3. Command the express down function of the driver door window by pressing down on the
driver's window switch past the first detent and releasing. The driver's window should roll
completely down.
If the function does not perform as specified, replace the driver window switch.
Circuit/System Testing
Driver Power Window Inoperative
1. Ignition OFF, disconnect the X2 harness connector at the driver window switch.
2. Test for less than 1 ohm between the ground circuit terminal A and ground.
If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal H and
ground.
If the test lamp does not illuminate, test the B+ circuit for a short to ground or an
open/high resistance.
4. Connect the X2 harness connector at the driver window switch, disconnect the harness
connector at the driver window motor.
5. Connect a test lamp between control circuit terminal A and control circuit terminal B.
6. Command the driver window UP and DOWN by using the driver window switch. The test
lamp should illuminate when commanding the UP and DOWN states.
If the test lamp is always OFF during either of the commands, test either control circuit
for a short to ground or open/high resistance. If the circuits test normal, replace the
driver window switch.
If the test lamp is always ON, test either control circuit for a short to voltage. If the
circuits test normal, replace the driver window switch.
7. If all circuits test normal, test or replace the driver window motor.
Passenger Power Window Inoperative
1. Ignition OFF, disconnect the harness connector at the passenger window switch.
2. Test for less than 1 ohm between the ground circuit terminal F and ground.
If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal G and
ground.
If the test lamp does not illuminate, test the B+ circuit for a short to ground or an
open/high resistance.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
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