🔧 Highlander - Rear Turn Signal Bulb Replacement

You’ll remove the rear tail lamp assembly, twist out the turn-signal bulb socket, and swap the bulb. This restores rear signaling so other drivers can see your turns clearly.

Difficulty Level: Beginner | Estimated Time: 0.5-1.0 hours

Assumption: Your Highlander uses a 7440 amber rear turn signal bulb.

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⚠️ Safety & Precautions

• ⚠️ Turn the lights OFF and remove the key before starting.
• ⚠️ Let bulbs cool if they were recently on; they can burn you.
• ⚠️ Wear gloves to keep oil off the new bulb glass (oil can shorten bulb life).
• ⚠️ Support the tail lamp with your hand so it doesn’t drop and crack.
• Battery disconnect is not required for this repair.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" drive ratchet
• 6" socket extension
• Plastic trim removal tool
• Flashlight
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Rear turn signal bulb (7440 amber) - Qty: 2 Replace in pairs
• Dielectric grease - Qty: 1 Optional

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Open the liftgate fully for access to the tail lamp fasteners.
• Have your flashlight ready so you can see the bulb socket orientation.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Access the rear tail lamp fasteners

• Open the liftgate.
• Locate the tail lamp mounting area on the side you’re working on (inside edge of the lamp, visible with the liftgate open).
• Use a flashlight to identify the 10mm fasteners and any small trim covers.

Step 2: Remove the tail lamp mounting fasteners

• If there’s a small cover hiding a fastener, gently pry it with a plastic trim removal tool.
• Use a 10mm socket, 6" socket extension, and 1/4" drive ratchet to remove the tail lamp fasteners.
• Place the fasteners somewhere safe so they don’t roll away.

Step 3: Remove the tail lamp assembly

• Hold the lamp with both hands.
• Pull the tail lamp straight rearward to release the alignment pins/clips. Don’t twist; pull straight.
• If it feels stuck, wiggle gently while pulling; do not use a metal tool on painted surfaces.

Step 4: Remove the rear turn signal bulb socket

• Find the turn signal bulb socket on the back of the tail lamp (it will twist-lock into the housing).
• Turn the socket counterclockwise by hand to unlock it, then pull it out.
• If it’s tight, use nitrile gloves for better grip.

Step 5: Replace the bulb

• Pull the old bulb straight out of the socket (it’s a push-in style).
• Install the new 7440 amber bulb by pushing it straight in until fully seated.
• Optional: Apply a tiny amount of dielectric grease to the socket seal area (not on the bulb glass or metal contacts). Dielectric grease helps prevent moisture and corrosion.

Step 6: Reinstall the socket and test the turn signal

• Insert the socket back into the tail lamp and twist clockwise by hand until it locks.
• Turn the ignition to ON and test that side’s rear turn signal (and hazards). Use your flashlight to confirm the bulb lights.
• If it doesn’t work: remove the socket and re-seat the bulb firmly, then test again.

Step 7: Reinstall the tail lamp assembly

• Align the lamp’s locating pins with the body holes.
• Press the lamp straight inward until it sits flush.
• Reinstall the fasteners using a 10mm socket, 6" socket extension, and 1/4" drive ratchet.
• Torque to 5 N·m (44 in-lbs)
• Reinstall any trim covers using the plastic trim removal tool (press them in by hand).

Step 8: Repeat on the other side

• Replace the bulb on the other rear lamp using the same steps. Matching bulbs look more even.

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✅ After Repair

• Test left and right rear turn signals and hazard lights.
• Confirm the tail lamp is seated evenly and there are no gaps.
• Over the next few days, check inside the lens for condensation (a sign the seal/socket isn’t fully locked).

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💰 DIY vs Shop Cost

Shop Cost: $80-$180 (parts + labor)

DIY Cost: $10-$30 (parts only)

You Save: $70-$150 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1.0 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.