2021-2024 Toyota Sienna Hybrid 12 Volt Vehicle Auxiliary Battery Replacement Instructions

Parts Needed

• Battery AGM Group 47
• Battery terminal protector spray

Tools Needed

• Socket and ratchet set(10mm)
• 1/4 inch impact driver
• Impact driver socket adapter set
• 1/4 inch torque wrench

Tips & Tricks

• →Always disconnect the negative terminal first to prevent arcing if the wrench contacts the vehicle body.
• →Reconnect the positive terminal first before the negative when reinstalling.
• →Use a vented AGM battery when replacing a hybrid auxiliary battery located inside the vehicle compartment.
• →Do not overtighten the battery hold-down bracket — overtightening can squeeze and deform the battery case.
• →Tighten battery bracket and terminal clamps to approximately 5 ft-lbs or until snug.
• →Ensure the negative terminal clamp is fully seated down on the post before tightening, or it won't grip properly.
• →Leave sliding doors closed before disconnecting the battery to avoid needing reinitialization, or be prepared to manually close them slowly to initialize.
• →After reconnection, initialize the power hatch by closing it slowly by hand.
• →Initialize the backup camera steering lines by turning the steering wheel full lock in each direction if the lines are lost.
• →An ICS warning light or lane keep assist warning after battery replacement can be cleared by driving straight over 40 mph for approximately 5 seconds.
• →After reinstallation, inspect vent hose routing to ensure it is not pinched behind the battery.
• →Apply battery terminal protective spray after reconnection to prevent corrosion.

Torque Specs