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.
Power Main Relay Test
Remove power main relay. See POWER MAIN RELAY LOCATION table. Using an ohmmeter, check continuity between terminals No. 1 and 2. Continuity should exist. See Fig 1 or Fig 2 . Apply battery voltage to terminal No. 1 and ground terminal No. 2. Continuity should exist between terminals No. 3 and 5. If continuity is not as specified, replace power main relay.
| Application | Location |
|---|---|
| Avalon, Camry, Camry Solara, Celica & ECHO | Junction Block Behind Instrument Panel, Left Of Steering Column |
| Corolla & Prius | On Relay Block No. 1, Left Side Kick Panel |
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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.
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