Every control module on the 1999-2004 Chevrolet Alero — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Body Control Module (BCM)1.5 hr R&Rdealer / factory tool +0.8 hr▸ programming details
📍 Behind center console, below radio and HVAC controls, accessible after removing trim panels
🔧 Tech 2 + TIS2000
⚠️ Controls interior lighting, power windows, door locks, remote keyless entry. VIN programming and theft deterrent relearn required.
📍 Integrated within Body Control Module (BCM); no separate physical module
🔧 Tech 2 + TIS2000
⚠️ Passlock II system standard. Ignition lock cylinder replacement requires 10-minute relearn procedure. BCM replacement requires theft deterrent programming.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2003 Chevrolet Alero 2.4L I4 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.