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.
HV Battery Cooling: Inspection
- INSPECT BLOWER MOTOR OPERATION (See DTC P3077: BATTERY COOLING FAN MOTOR CIRCUIT MALFUNCTION )
- INSPECT BATTERY FAN RELAY
- Remove the battery fan relay.
- Inspect the battery fan relay continuity.
- Using an ohmmeter, check that there is continuity between terminals 1 and 2.
If there is no continuity, replace the relay.
- Check that there is no continuity between terminals 3 and 5.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If there is continuity, replace the relay.
- Using an ohmmeter, check that there is continuity between terminals 1 and 2.
- Inspect the battery fan relay operation.
- Apply battery voltage across terminals 1 and 2.
- Using an ohmmeter, check that there is continuity between terminals 3 and 5.
If there is no continuity, replace the relay.
- Install the battery fan relay.
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.
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