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Fitment notes: Side post terminals standard on GM vehicles of this era; higher CCA recommended for turbocharged application
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Every control module on the 1984-1987 Buick Grand National — where it lives, replacement time, and what it takes to program a replacement.
Electronic Climate Control Module (ECC)2.0 hr R&Rno coding
📍 Behind center instrument panel, integrated with HVAC controls
⚠️ Optional automatic climate control only; manual A/C systems use no module. ECC self-diagnostics via button sequence; no external scan tool required.
Body Control Module (BCM)1.8 hr R&Rrelearn only +0.5 hr▸ programming details
📍 Behind right side of instrument panel, above kick panel
🔧 Tech 1 scanner for VATS relearn
⚠️ Controls VATS (Vehicle Anti-Theft System), power accessories, and lighting. VATS resistor key relearn required after replacement. BCM failure common; used units must match VATS resistance or require new key/lock cylinder.
⚠️ Digital/analog hybrid cluster; odometer stored in cluster. No programming required but mileage transfer not possible in this era.
Engine Control Module (ECM)1.2 hr R&Rrelearn only +0.3 hr▸ programming details
📍 Passenger side firewall, behind glove box area
🔧 PROM chip swap by VIN + ALDL relearn
⚠️ Turbo 3.8L V6 uses replaceable PROM chip for calibration; chip must match VIN/build. ALDL code clear and idle relearn required. Tech 1 scanner preferred but not mandatory for basic replacement.
Radio/Audio System Module (Radio)0.6 hr R&Rno coding
📍 Center instrument panel, radio cavity
⚠️ Delco/Bose systems common. No anti-theft coding in 1984-1985; 1986-1987 may have Delco LOC (theft deterrent) requiring dealer code retrieval.
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 1987 Buick Grand National 3.8L V6 Turbo 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.