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Chevrolet Silverado / GMC Sierra. Manual - part 2966
Schematic Reference
Moveable Window Schematics
Door Control Module 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
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON, observe the operation of the power windows while commanding each window
UP and DOWN by using their respective window switches, each window should perform
the UP and DOWN function.
If the driver window is inoperative, refer to Driver Window Malfunction.
If the front passenger window is inoperative, refer to Passenger Window Malfunction.
If either rear passenger power window is inoperative, refer to Rear Passenger Window
Malfunction.
2. Observe the scan tool Driver RF Window Switch, Driver LR Window Switch and Driver
RR Window Switch parameters while using the driver master control switches. The
parameter should change between Off/Up/Down/Express Down.
If the parameter does not change, replace the DDS.
3. Observe the scan tool Window Lockout Switch parameter while pressing and depressing the
window lockout switch on the driver master control. The parameter should change between
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
On and Off.
If the parameter does not change, replace the DDS.
Circuit/System Testing
Driver Power Window Inoperative
1. Ignition OFF, disconnect the X1 harness connector at the DDS.
2. Test for less than 15 ohms between the ground circuit terminal 6 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 2 and
ground.
If the test lamp does not illuminate, test the B+ circuit for a short to ground or an
open/high resistance.
4. Ignition OFF, connect the harness connector at the DDS.
5. Ignition ON, observe the scan tool Driver LF Window Switch parameters while using the
driver power window switch. The reading should change between Off/Up/Down/Express
Down.
If the parameter does not change, replace the DDS.
6. Ignition OFF, disconnect the harness connector at the driver window motor.
7. Connect a test lamp between control circuit terminal A and control circuit terminal B.
8. Ignition ON, 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
DDS.
If the test lamp is always ON, test either control circuit for a short to voltage. If the
circuits test normal, replace the DDS
9. If all circuits test normal, test or replace the driver window motor.
Passenger Power Window Inoperative
1. Ignition OFF, disconnect the X1 harness connector at the PDS.
2. Test for less than 1 ohm between the ground circuit terminal 6 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 2 and
ground.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
If the test lamp does not illuminate, test the B+ circuit for a short to ground or an
open/high resistance.
4. Ignition OFF, reconnect the harness connector at the PDS.
5. Ignition ON, observe the scan tool Passenger Window Switch parameters while using the
passenger power window switch. The reading should change between
Off/Up/Down/Express Down.
If the parameter does not change, replace the PDS.
6. Ignition OFF, disconnect the harness connector at the passenger window motor.
7. Test for less than 1 ohm between the control circuit terminal A and ground
If greater than the specified range, test the control circuit for a short to voltage or an
open/high resistance. If the circuit tests normal, replace the PDS.
8. Test for less than 1 ohm between the control circuit terminal B and ground
If greater than the specified range, test the control circuit for a short to voltage or an
open/high resistance. If the circuit tests normal, replace the PDS.
9. Connect a test lamp between control circuit termina A and control circuit terminal B.
10. Ignition ON, command the passenger window UP and DOWN by using the passenger
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. If the circuits test normal, replace the PDS.
11. If all circuits test normal, test or replace the passenger window motor.
Rear Power Window Inoperative
1. Ignition OFF, disconnect the harness connector at the appropriate rear 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.
4. Enable the rear windows by using the window lockout switch.
5. Test for more than 10 volts on the control circuit terminal D.
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.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
6. Test for more than 10 volts on the signal circuit terminal C 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.
7. Test for more than 10 volts on the signal circuit terminal A 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.
8. Ignition OFF, connect harness connector at the rear window switch and disconnect the
harness connector at the rear window motor
9. Test for less than 1 ohm between the control circuit terminal A and ground
If greater than the specified range, test the control circuit for a short to voltage or an
open/high resistance. If the circuit tests normal, replace the rear window switch.
10. Test for less than 1 ohm between the control circuit terminal B and ground
If greater than the specified range, test the control circuit for a short to voltage or an
open/high resistance. If the circuit tests normal, replace the rear window switch.
11. Connect a test lamp between control circuit terminal A and control circuit terminal B.
12. Ignition ON, command the rear window UP and DOWN by using the rear 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. If the circuits test normal, replace the rear window switch.
13. If all circuits test normal, test or replace the rear window motor.
Component Testing
1. Ignition OFF, disconnect the harness connector at the appropriate window motor.
2. Install a 25-amp fused jumper wire between the control terminal A and 12 volts.
Momentarily install a jumper wire between the control terminal B and ground. The window
motor should perform the UP or DOWN function.
If the function does not perform as specified, replace the window motor.
3. Reverse the jumper wires; the appropriate window motor should perform the DOWN or UP
function.
If the function does not perform as specified, replace the window motor
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
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