Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Power Window Express Down Function Inoperative
2008 Pontiac Grand Prix BaseSECTION Power Window Express Down Function Inoperative
WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
Power Window Express Down Function Inoperative
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Moveable Window Schematics Connector End View Reference: Window Systems Connector End Views |
|||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 | Activate the power window switch to the express down position and release the power window switch. Does the power window continue to travel downward after the power window switch is released? |
Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
| 3 |
|
Go to Step 4 | Go to Step 6 |
| 4 | Is the express down function inoperative on the passenger front power window? | Go to Step 5 | Go to Step 6 |
| 5 | Inspect for poor connections at the passenger door module (PDM). Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 9 | Go to Step 7 |
| 6 | Inspect for poor connections at the driver door module (DDM). Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 9 | Go to Step 8 |
| 7 | Replace the PDM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the repair? |
Go to Step 9 | - |
| 8 | Replace the DDM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the repair? |
Go to Step 9 | - |
| 9 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 3 |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.