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.
1990 Oldsmobile Custom CruiserFACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location | |
|---|---|---|
| A/C Programmer (Auto. A/C) | Behind right side of dash, on A/C-heater plenum. | |
| A/C Blower/Clutch Control Module | On top of blower plenum. | |
| Audio Alarm Module | On convenience center. | |
| Electronic Control Module (ECM) | ||
| Carbureted Equipped Models | Behind right kick panel. See Figure . | |
| TBI Equipped Models | Behind right kick panel. See Figure . | |
| Elect. Spark Control (ESC) Module | ||
| Carbureted Equipped Models | At center of firewall. See Figure . | |
| TBI Equipped Models | At center of firewall. See Figure . | |
| Illuminated Entry Timer | Behind dash, left of steering column. | |
| Light Driver Module (Carb.) | Behind right side of dash, above ECM. See Figure . | |
| Multi-Function Chime Module | On convenience center. | |
| Twilight Sentinel Control | Under left side of dash, at rear of headlight switch. | |
Factory Service Tools
Use the Manual With the Right Hardware
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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.