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.
2002 Chevrolet Impala LSFACTORY OEM SERVICE PROCEDURE
Test B: Express Down Feature Inoperative
- Review information in DESCRIPTION & OPERATION . Go to next step.
- Attempt to operate express down feature. If express down feature is inoperative, go to next step. If express down feature operates, perform appropriate test. See SYMPTOM INDEX table.
- Check for poor connections at master switch assembly harness connector. Repair as necessary. After repair, go to step 5 . If no problem is found, go to next step.
- Replace master switch assembly. See WINDOW SWITCH under REMOVAL & INSTALLATION. After repair, go to next step.
- Operate system to verify repairs. If system does not operate properly, go to step 2 . If system operates properly, system is okay.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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