Determine one door or all doors
A shared failure points upstream toward common power/control. One affected door points farther downstream toward that door circuit, actuator or mechanism.
BODY ELECTRICAL · 2002 · DOOR LOCKS
2002 Firebird Power Door Locks Inoperative
One dead lock and all locks dead are different failures. Start with scope before replacing an actuator or switch.
APPLICATION: 2002 Pontiac Firebird / Formula / Trans Am. Configuration-specific equipment must match the vehicle before applying a circuit path.
Check other body functions
Body-control and remote-keyless-entry behavior can provide clues when multiple accessories fail together.
Inspect door wiring and mechanism
Look for connector damage, harness problems and mechanical binding before condemning an actuator.
DO NOT REPLACE THE ACTUATOR YET
Prove that the affected actuator receives the correct electrical command and that the latch/linkage is free.
FPV RULE
OBSERVE → MEASURE → ISOLATE → PROVE → REPAIR → VERIFY. A symptom or DTC is a starting point, not a parts verdict.
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 →