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.
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HOMESERVICE MANUALSTOYOTA2003PRIUSREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEMHV BATTERYDISASSEMBLY
2003 Toyota Prius
HV Battery: Disassembly
2003 Toyota PriusSECTION Disassembly
- REMOVE BATTERY MODULE SET BOLT
Turn the battery assembly upside down, remove the 76 battery module bolts.
NOTE: When turning it over, prevent the flange from being deformed.HINT:
When not removing a battery module, skip the operation of step 1.
- REMOVE BATTERY COVER
Remove the 12 bolts, screw and battery cover.
- REMOVE SERVICE PLUG
- Remove the rear RH and LH bus bar module protectors.
- Remove the 2 nuts for bus bar module.
- Remove the nut and wire harness protector.
- Remove the 3 bolts and service plug assembly.
- REMOVE POWER CABLE FOR SMR
- Remove the front RH and LH bus bar module protectors.
- Remove the 2 nuts, and disconnect the power cable from the front bus bar module.
- Remove the SMR cover from the SMR.
- Remove 2 bolts, and disconnect the power cable for SMR.
- REMOVE SMR
- Using the service plug, turn the interlock counterclockwise to unlock.NOTE: When the interlock is damaged, be sure to replace it with new one.
- Remove the 3 bolts and SMR.
- Using the service plug, turn the interlock counterclockwise to unlock.
- REMOVE HV BATTERY THERMISTOR
- REMOVE BATTERY ECU
- Disconnect the connector.
- Remove the 2 bolts and battery ECU.
- REMOVE BATTERY HOSE
- REMOVE BUS BAR MODULE
- Remove the 36 nuts, RH and LH rear bus bar modules.
- Remove the 36 nuts, RH and LH front bus bar modules.
- REMOVE BATTERY CLAMP BOLT
Remove the 4 bolts and battery clamp bolt.
CAUTION: Never remove the battery clamp bolt until 4 hours has passed after the ignition switch is turned OFF. An explosion due to expansion could occur.
RENDER: 1.0x
NO RELATED
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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.