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
Below 11.0 V
Replace auxiliary battery
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
11.0 to 12.5 V
Recharge auxiliary battery
Below 11.5 V
Replace auxiliary battery
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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