Keep the systems separate
A seat can move normally while the lumbar system is inoperative. Record which functions work before disassembly.
SEATS · 2002
2002 Firebird Lumbar Support Inoperative Diagnosis
Lumbar failure is its own seat-system complaint and should not be diagnosed as a main seat-adjuster failure.
APPLICATION: 2002 Pontiac Firebird / Formula / Trans Am with the factory system described. Match options and installed hardware before applying a circuit path.
Inspect the local circuit
Check the lumbar switch, accessible connectors, wiring and the seat cushion/air-control components applicable to the installed seat.
Watch for intermittent wiring
Movement of the seat can flex the under-seat harness. If the symptom changes with seat position, inspect terminals and routing before replacing components.
DO NOT REPLACE THE WHOLE SEAT
Isolate the lumbar branch. Main power-seat operation does not prove or condemn the lumbar components.
FPV RULE
OBSERVE → MEASURE → ISOLATE → PROVE → REPAIR → VERIFY. A symptom 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 →