Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBUICK1990REGAL CUSTOM, 3.8 L, 4T60/ME9REPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSELECTRICAL COMPONENT LOCATIONSELECTRICAL COMPONENT LOCATORCONTROL UNITS
1990 Buick Regal Custom, 3.8 L, 4T60/ME9
Control Units
1990 Buick Regal Custom, 3.8 L, 4T60/ME9SECTION Control Units
CONTROL UNITS LOCATION
| Component | Location | |
|---|---|---|
| ABS Controller | Under passenger's seat. | |
| Chime Module | In convenience center. See Figure . | |
| Cruise Control Module | Behind instrument cluster, to left of brake pedal support. | |
| Daytime Running Light (DRL) Module | Behind instrument panel, left of steering column. | |
| Direct Ignition System (DIS) Module (1989) | Below exhaust manifold, on left side of engine. See Figure . | |
| Direct Ignition System (DIS) Module (1990) | Below exhaust manifold, on left side of engine. See Figure . | |
| Driver Information Center (DIC) Module | Behind right side of Instrument panel. | |
| Electronic Control Module (ECM) | ||
| 1989 | In engine compartment, in front of right strut tower. See Figure . | |
| 1990 2.3L | In engine compartment, in front of right strut tower. See Figure . | |
| 1990 3.1L (VIN T) | In engine compartment, in front of right strut tower. See Figure . | |
| 1990 3.1L (VIN V) | In engine compartment, in front of right strut tower. See Figure . | |
| Keyless Entry Module | ||
| 1989 | RH rear of luggage compartment, on rear window panel. | |
| 1990 Grand Prix | In right rear of luggage compartment. | |
| 1990 Except Grand Prix | In luggage compartment near right rear speaker. | |
| Lumbar Seat Control Module | Under driver's seat. | |
| Park/Turn Light Module | In forward light electrical center. See Figure . | |
| Passive Restraint Control Module | Behind right side of dash, above convenience center. | |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.