GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2007 🢒 Lumina VE 🢒 Body Systems 🢒 Fixed and Moveable Windows 🢒 Power Window Express Down Function Inoperative

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Circuit/System Description

The power window express function is operated by the window switch, window motor and power window control module. The system is powered by a battery supply circuit, ignition supply and retained accessory power signal circuit. These determine when the window may be operated. The switch signal circuits supply battery voltage which is supplied via a relay and monitored within the BCM. When a front window switch is pressed for a duration of .4 seconds the express down function is acknowledged by the power window control module and supplies power to the window until it reaches the fully down position.

Reference Information

Schematic Reference

Moveable Window Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Circuit/System Verification
  1. Verify that the Retained Accessory Power (RAP) circuit is functioning normally.
    2. ⇒If the RAP is not functioning normally refer to Retained Accessory Power (RAP) Description and Operation .

Circuit/System Testing

Window Switch Test

  1. Disconnect the window switch harness connector.
  2. Verify less than 1 ohm of resistance from the ground circuit terminal and ground.
    3. ⇒If the resistance is greater than the specified value, repair the ground circuit for an open/high resistance.
  3. Ignition On, connect a fused jumper wire from the ground circuit terminal in the harness connector to the open signal circuit terminal and verify that the window opens.
    4. ⇒If the window does not open perform the Window Motor Circuit Test.
  4. Connect a fused jumper wire from the ground circuit terminal to the close signal circuit terminal and verify that the window closes.
    5. ⇒If the window does not close perform the Window Motor Circuit Test.
  5. Connect a fused jumper wire from the ground circuit terminal to the open signal circuit terminal and verify that the window opens.
    6. ⇒If the window does not open perform the Window Motor Circuit Test.
  6. Connect a fused jumper wire from the ground circuit terminal to the close signal circuit terminal and verify that the window closes.
    7. ⇒If the window does not close perform the Window Motor Circuit Test.
  7. Connect a fused jumper wires from the ground circuit terminal to the express signal circuit terminal the open signal circuit terminal and verify that the wind express opens.
    8. ⇒If the window does not express open perform the Window Motor Circuit Test.
  8. If all circuits test normal, replace the window switch.

Window Motor Circuit Test

  1. Disconnect the window motor harness connector.
  2. Verify less than 1 ohm of resistance from the ground circuit terminal and ground.
    3. ⇒If the resistance is greater than the specified value, repair the ground circuit for an open/high resistance.
  3. Connect a test lamp from the ground circuit terminal to the battery supply circuit terminal and verify that the test lamp illuminates.
    4. ⇒If the test lamp does not illuminate, repair the battery supply circuit for an open/high resistance or short to ground.
  4. Ignition on, connect a test lamp from the ground circuit terminal to the ignition supply circuit terminal and verify that the test lamp illuminates.
    5. ⇒If the test lamp does not illuminate, repair the ignition supply circuit for an open/high resistance or short to ground.
  5. Ignition on, connect a test lamp from the ground circuit terminal to the accessory supply circuit terminal and verify that the test lamp illuminates.
    6. ⇒If the test lamp does not illuminate, repair the accessory supply circuit for an open/high resistance or short to ground.
  6. Connect the window motor connector and disconnect the window switch connector.
  7. Ignition on, verify that battery voltage is present at each of the switch signal circuit terminals in the switch harness connector.
    8. ⇒If battery voltage is not present at all of the signal circuits, test the affected signal circuit for an open/high resistance or short to ground. If the circuit tests normal replace the window motor.
  8. If all circuits test normal, replace the window motor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Front Side Door Window Regulator Replacement .
    •  Power Mirror Switch Replacement .
    •  Front Door Module Replacement .

Step

Action

Yes

No

Schematic Reference: Moveable Window Schematics

Connector End View Reference: Component Connector End Views

1
  1. Front windows in the fully up position.
  2. Turn key on to the Accessory Position.
  3. Press down the right front window switch momentarily. (less than .5 seconds)

Does the right front window move down with each button press?

Go to step 2

Go to step 7

2
  1. Right front windows in the partial / fully DOWN position.
  2. Key in the accessory position.
  3. Pull up the right front window switch momentarily. (less than .5 seconds)

Does the right front window move up with each button press?

Go to step 3

Go to step 10

3
  1. Right front window in the fully up position.
  2. Key in the accessory position.
  3. Press down the right front window switch and hold for 1 second then release.

Does the right front window move down automatically? Can it be cancelled with momentary front up or down switch activation?

Go to step 4

Go to Replace PWCM and repeat tests from step 1

4
  1. Left front window in the fully up position.
  2. Key in the accessory position.
  3. Press down the left front window switch momentarily. (less than .5 seconds)

Does the left front window move up with each button press?

Go to step 5

Go to step 11

5
  1. Left front windows in the partial / fully DOWN position.
  2. Key in the accessory position.
  3. Pull up the left front window switch momentarily. (less than .5 seconds)

Does the left front window move up with each button press?

Go to step 6

Go to step 13

6
  1. Left front window in the fully up position.
  2. Key in the accessory position.
  3. Press down the left front window switch and hold for 1 second then release.

Does the left front window move down automatically? Can it be cancelled with momentary front up or down switch activation?

System is serviceable

Replace PWCM and repeat tests from step 1

7

Back probe power (circuit 1001) and ground circuit (2050) to the power window control module.

Is there 12V supplied to the PWCM?

Go to step 8

Diagnose accessory circuit (1001), ground (2050), BCM and circuit breaker B2/20A_X129

8
  1. Back probe right down switch input (circuit 167 - Pin 9) to a known ground.
  2. Press down right window switch.

Is the value 12V when the switch is pressed and 0V when the switch is deactivated?

Go to step 9

Diagnose windows switch sub-system, and circuit 167

9
  1. Connect a test light on PWCM motor outputs for the right front window motor. (circuit 666 pin 1 and 667 pin 10)
  2. Press down right window switch.

Does the test light illuminate for 20 seconds (max)?

Diagnose right front window motor

Replace PWCM and repeat tests from step 1

10
  1. Back probe the right up switch input (circuit 166 - 3) to a known ground.
  2. Pull up the right window switch.

Is the value 12V when the switch is pressed and 0V when the switch is deactivated?

Replace PWCM and repeat tests from step 1

Diagnose windows switch sub-system, and circuit 166

11
  1. Back probe the left down switch input circuit (circuit 1136 - pin 12) to a known ground.
  2. Press the left switch down.

Is the value 12V when the switch is pressed and 0V when the switch is deactivated?

Go to step 12

Diagnose windows switch sub-system, and circuit 1136

12
  1. Connect a test light on the PWCM motor outputs for the left window motor. (circuit 164 pin 11 and 165 pin 2)
  2. Press down the left window switch.

Does the test light illuminate for 20 seconds?

Diagnose left front window motor

Replace PWCM and repeat tests from step 1

13
  1. Back probe the left up window switch input (circuit 1300 - pin 6) to a known ground.
  2. Pull up the left window switch.

Is the value 12V when the switch is pressed and 0V when the switch is deactivated?

Replace PWCM and repeat tests from step 1

Diagnose the window switch sub-system and circuit 1300