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 MANUALSCHEVROLET1989STEP VAN P30, 4.8 T, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALCOMPONENT LOCATIONSELECTRICAL COMPONENT LOCATORCONTROL UNITS
1989 Chevrolet Step Van P30, 4.8 T, Standard
Control Units
1989 Chevrolet Step Van P30, 4.8 T, StandardSECTION Control Units
CONTROL UNITS LOCATION
| Component | Location | |
|---|---|---|
| Audio Alarm Module | On bracket, to left of steering column. | |
| Cruise Control Module | On brake pedal bracket. | |
| Electronic Control Module (ECM) | ||
| 4.3L | Under driver's seat. See Figure. | |
| 5.0L & 5.7L - 1989 | Under driver's seat. See Figure. | |
| 5.0L & 5.7L - 1990 | Under driver's seat. See Figure. | |
| 7.4L - 1989 | Under driver's seat. See Figure. | |
| 7.4L - 1990 | Under driver's seat. See Figure. | |
| Elect. Spark Control (ESC) Module | ||
| 4.3L | Under driver's seat. See Figure. | |
| 5.0L & 5.7L - 1989 | Under driver's seat. See Figure. | |
| 5.0L & 5.7L - 1990 | Under driver's seat. See Figure. | |
| Glow Plug Controller (Diesel) | ||
| Diesel Component View | On left rear of intake manifold. See Figure. | |
| Diesel Engine Component View | On left rear of intake manifold. See Figure. | |
| Hot Fuel Handling Module | ||
| 5.0L & 5.7L - 1989 | Under driver's seat. See Figure. | |
| 5.0L & 5.7L - 1990 | Under driver's seat. See Figure. | |
| 7.4L - 1989 | Under driver's seat. See Figure. | |
| 7.4L - 1990 | Under driver's seat. See Figure. | |
| Hydro-Boost Elect. Delay Module | Behind left side of instrument panel. | |
| Light Driver Module (Diesel) | Under right side of dash. | |
| Power Door Lock Delay Module | Above left kick panel. | |
| Pulse Wiper Control Module | Taped to harness, at right side of steering column. | |
| RWAL Elect. Control Unit | In engine compartment on bracket attached to master cylinder. | |
RENDER: 1.0x
NO RELATED
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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.