🔧 Highlander - Battery Replacement

Replacing the 12-volt battery on your Highlander is a beginner-friendly repair. The battery powers the starter, computers, lights, and accessories, and replacing it can fix slow cranking, no-start issues, and weak electrical performance.

Difficulty Level: Beginner | Estimated Time: 20-40 minutes

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⚠️ Safety & Precautions

• ⚠️ Wear safety glasses and nitrile gloves. Battery acid can burn skin and eyes.
• ⚠️ Always remove the negative battery cable first. This reduces the chance of sparks or short circuits.
• ⚠️ Do not let tools touch both battery terminals at the same time.
• ⚠️ Keep flames, cigarettes, and sparks away from the battery area.
• ⚠️ Battery disconnect may reset clock, radio presets, idle memory, and window auto functions.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 10mm wrench
• Ratchet handle 3/8-inch drive
• 6-inch extension 3/8-inch drive
• Battery terminal brush
• Battery carrier strap
• Torque wrench inch-pound 3/8-inch drive
• Safety glasses
• Nitrile gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 12-volt automotive battery - Qty: 1
• Battery terminal protector spray - Qty: 1
• Battery anti-corrosion washers - Qty: 2

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📋 Before You Begin

• Park your Highlander on level ground.
• Shift to Park and set the parking brake.
• Turn the ignition off and remove the key from the vehicle.
• Open the hood and let the vehicle sit for a few minutes so electrical modules can power down.
• A battery terminal is the metal post on top of the battery where the cable clamps attach.
• A hold-down bracket is the clamp that keeps the battery from moving while driving.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Locate the Battery

• Open the hood and support it securely.
• The 12-volt battery is in the engine bay.
• Put on safety glasses and nitrile gloves.
• Use a battery terminal brush only if you see white, blue, or green corrosion on the terminals.

Step 2: Remove the Negative Cable First

• Find the negative terminal marked with a - symbol.
• Use a 10mm wrench or 10mm socket to loosen the negative cable clamp nut.
• Lift the negative cable off the battery post and move it aside so it cannot touch the post again.
• Negative cable always comes off first.

Step 3: Remove the Positive Cable

• Open the red plastic cover over the positive terminal marked with a + symbol.
• Use a 10mm wrench or 10mm socket to loosen the positive cable clamp nut.
• Lift the positive cable off the battery post and move it aside.
• Do not let the positive cable touch metal body parts.

Step 4: Remove the Battery Hold-Down

• Use a 10mm socket, ratchet handle 3/8-inch drive, and 6-inch extension 3/8-inch drive to loosen the battery hold-down hardware.
• Remove the hold-down bracket and set it aside.
• Keep the bolts and hooks in order so they go back the same way.

Step 5: Lift Out the Old Battery

• Attach a battery carrier strap to the battery if available.
• Lift the battery straight up and out of the tray.
• Batteries are heavy, so keep your back straight and lift with both hands.
• Place the old battery upright on the ground.

Step 6: Clean the Cable Ends and Tray

• Use a battery terminal brush to clean the inside of both cable clamps.
• Clean the battery tray area with a shop-safe dry wipe if dirt or corrosion is present.
• Do not rinse the engine bay with water during this job.
• Clean terminals help prevent no-start problems.

Step 7: Install the New Battery

• Use the battery carrier strap to lower the new battery into the tray.
• Make sure the positive and negative posts are on the same sides as the original battery.
• Install the battery hold-down bracket.
• Use the 10mm socket, ratchet handle 3/8-inch drive, and torque wrench inch-pound 3/8-inch drive to tighten the hold-down evenly.
• Torque to 5 Nm (44 in-lbs) if using Toyota-style small battery hold-down hardware.
• Do not overtighten. The battery case can crack.

Step 8: Connect the Positive Cable First

• Install one battery anti-corrosion washer over the positive post if used.
• Place the positive cable clamp fully down onto the positive battery post.
• Use a 10mm wrench or 10mm socket to tighten the clamp nut.
• Torque to 5.4 Nm (48 in-lbs).
• Close the red positive terminal cover.

Step 9: Connect the Negative Cable Last

• Install one battery anti-corrosion washer over the negative post if used.
• Place the negative cable clamp fully down onto the negative battery post.
• Use a 10mm wrench or 10mm socket to tighten the clamp nut.
• Torque to 5.4 Nm (48 in-lbs).
• Spray a light coat of battery terminal protector spray on both terminals.

Step 10: Check Your Work

• Use your hand to gently wiggle each cable clamp.
• If a clamp moves, use the 10mm wrench to tighten it slightly more.
• Make sure the battery does not slide or rock in the tray.
• Confirm no tools are left in the engine bay.

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✅ After Repair

• Start your Highlander and confirm it cranks normally.
• Set the clock if it reset.
• If the power window auto function does not work, fully close the window and hold the switch up for about 2 seconds.
• Let the engine idle for a few minutes. The idle may feel slightly different while the computer relearns.
• Recycle the old battery at a parts store or recycling center. Do not throw it in regular trash.

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💰 DIY vs Shop Cost

Shop Cost: $220-$380 (parts + labor)

DIY Cost: $140-$260 (parts only)

You Save: $80-$120 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.3-0.6 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.