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.
1996 Pontiac Firebird Formula, 2D Convertible, AutomaticFACTORY OEM SERVICE PROCEDURE
Left Front Window Does Not Operate
- Turn ignition switch to RUN position. Using a test light, backprobe between ground and Brown wire terminal at master switch connector. If test light is on, go to next step. If test light is off, repair open in Brown wire between master switch and power window 30-amp circuit breaker.
- Backprobe between Dark Blue wire and Gray wire terminals at master switch connector. While observing test light, press left window switch at master switch to up and down positions. If test light is on, go to next step. If test light is off, check for poor connection at master switch. If connection is okay, replace master switch.
- Backprobe between Dark Blue wire and Gray wire terminals at express down module connector, located at center of dash mat, above floor tunnel. While observing test light, press left window switch at master switch to up and down positions. If test light is on, go to next step. If test light is off, repair open in Dark Blue wire or Gray wire between master switch and express down module.
- Backprobe between Dark Blue wire and Brown wire terminals at express down module connector. While observing test light, press left window switch at master switch to up and down positions. If test light is on, go to next step. If test light is off, check for poor connection at express down module. If connection is okay, replace express down module.
- Disconnect left window motor connector. Connect test light between Dark Blue wire and Brown wire terminals at left window motor connector. While observing test light, press left window switch at master switch to up and down positions. If test light is on, check for poor connection at left window motor. If connection is okay, replace motor. If test light is off, repair open in Dark Blue wire or Brown wire between express down module and left window motor.
Factory Service Tools
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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.