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.
2012 Toyota Prius TwoFACTORY OEM SERVICE PROCEDURE
Service Data
| Auxiliary battery voltage | Positive (+) terminal - Negative (-) terminal | 20°C (68°F), Power switch off | 12.5 V or higher Auxiliary battery is OK |
| 11.0 to 12.5 V Recharge auxiliary battery |
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| Below 11.0 V Replace auxiliary battery |
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| Recharge auxiliary battery | S46B24R | 4 to 5 A | |
| Positive (+) terminal - Negative (-) terminal | 20°C (68°F), Power switch off | 12.5 V or higher Auxiliary battery is OK |
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| 11.0 to 12.5 V Recharge auxiliary battery |
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| Below 11.5 V Replace auxiliary battery |
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| Fuse | Standard resistance | Below 1 Ω | |
| DC/ DC converter function | Current flowing from auxiliary battery Auxiliary battery positive cable |
Power switch on (READY) (The headlight position switch and blower motor switch are in the HI position, and the rear window defogger is turned on.) | 0 A or less (no current from auxiliary battery) |
| Auxiliary battery voltage Positive (+) terminal - Negative (-) terminal |
13 to 15 V | ||
| Auxiliary battery thermometer sensor | Standard Resistance | 1 - 2 | 3.00 to 3.73 kΩ at 10°C (50°F) |
| 2.45 to 2.88 kΩ at 15°C (59°F) | |||
| 1.95 to 2.30 kΩ at 20°C (68°F) | |||
| 1.60 to 1.80 kΩ at 25°C (77°F) | |||
| 1.28 to 1.47 kΩ at 30°C (86°F) | |||
| 1.00 to 1.22 kΩ at 35°C (95°F) | |||
| 0.80 to 1.00 kΩ at 40°C (104°F) | |||
| 0.65 to 0.85 kΩ at 45°C (113°F) | |||
| 0.50 to 0.70 kΩ at 50°C (122°F) | |||
| 0.44 to 0.60 kΩ at 55°C (131°F) | |||
| 0.36 to 0.50 kΩ at 60°C (140°F) | |||
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.
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