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.
1993 Geo Prizm Base, StandardFACTORY OEM SERVICE PROCEDURE
Ignition Switch Test
- Using test light connected to ground, backprobe White wire and Black/Red wire terminal of ignition switch connector. Connector is located behind lower instrument panel. Test light should glow.
- If test light does not glow, check fusible link AM2. Fusible link box is located on positive battery cable. Check for open in wiring circuit to ignition switch. See appropriate chassis wiring diagram in WIRING DIAGRAMS .
- Turn ignition switch to START position. Using a test light, backprobe Black/White wire terminal at ignition switch connector (start circuit) and Blue/Red wire terminal (ignition power circuit). Test light should glow. If test light does not glow at either terminal, replace ignition switch.
Factory Service Tools
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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.