Both windows dead
Start upstream: RAP/ignition state, shared circuit protection and system power. Two dead windows are not evidence that two motors failed together.
BODY ELECTRICAL · 2002
2002 Firebird Power Windows — Separate Power, Control and Drag
2002 Firebird power-window diagnosis separating RAP/shared power, switch/control, loaded wiring, motor and mechanical binding before parts replacement.
APPLICATION: 2002 Pontiac Firebird / Formula / Trans Am with power windows. Body-electrical scope; engine family does not change the basic 2002 window architecture.
One window dead or slow
Check mechanical binding and loaded electrical delivery, then separate switch/control, wiring, motor and regulator/mechanism.
Driver express-down only
The driver's express-down feature uses its own power-window control module. Treat an express-down complaint differently from a completely dead motor circuit.
What the 2002 system does
- The BCM controls Retained Accessory Power (RAP) that can supply the windows after key-off until the RAP period ends or a door is opened.
- The window motors are reversible; switch direction reverses motor polarity.
- Each motor contains an internal circuit breaker that can open at end-of-travel or when the window is obstructed.
DO NOT REPLACE YET
Slow window ≠ proven motor
Mechanical drag can increase current demand and trigger protection. Inspect binding/track/regulator condition and test voltage delivery under load before condemning the motor.
Modified-car checkpoint
Alarm/remote-start wiring, audio work, added relays and prior door-harness repairs can alter accessory circuits. Inspect what has been changed before blaming the BCM, switch or motor.
AFTER THE FAILURE IS PROVEN
Use the proven failed branch—not the original symptom—to choose the replacement. Go from diagnosis to the Parts Verdict →