🔧 Tundra - Rear Turn Signal Bulb Replacement

The rear turn signal bulbs are accessed by removing each taillight assembly. This is a simple repair with no wiring changes or scan-tool programming required.

Difficulty Level: Beginner | Estimated Time: 15–30 minutes

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⚠️ Safety & Precautions

• ⚠️ Switch off the ignition and all exterior lights before starting.
• 🧤 Allow the bulbs to cool before touching them.
• 🔌 Battery disconnection is not required.
• 💡 Do not force the taillight sideways; its locating pins release by pulling the assembly straight rearward.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4-inch drive ratchet
• 1/4-inch drive torque wrench rated 2–20 Nm
• Plastic trim-removal tool (specialty)
• Nitrile work gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 7440NA amber rear turn signal bulbs - Qty: 2 - Replace in pairs

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📋 Before You Begin

• 🚙 Park your Tundra on level ground, select Park, and engage the parking brake.
• 🔑 Switch off the ignition, remove the key, and turn off the exterior lights.
• 📦 Lower the tailgate to expose the two taillight mounting bolts on each side.
• 🧤 Put on safety glasses and nitrile work gloves.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the Taillight Bolts

• Use a 10mm socket and 1/4-inch drive ratchet to remove the two bolts along the inner edge of the taillight.
• Support the assembly with one hand after removing the second bolt.

Step 2: Release the Taillight Assembly

• Grip the inner edge and pull the taillight straight toward the rear of your Tundra.
• If it is tight, use a plastic trim-removal tool gently between the forward edge of the lamp and body.
• The locating pins are smooth alignment posts that hold the outer edge in place.
• Do not twist the assembly or pull it sideways.
• Use steady pressure instead of sudden force.

Step 3: Remove the Turn Signal Socket

• Support the taillight so its wiring is not stretched.
• Locate the turn signal socket connected to the amber section of the lamp.
• Using your gloved hand, rotate the socket counterclockwise approximately one-quarter turn.
• Pull the socket straight out of the housing.

Step 4: Replace the Bulb

• Use your gloved fingers to pull the old wedge-base bulb straight out of its socket.
• Align the contacts of the new 7440NA amber bulb with the socket.
• Push the bulb straight into the socket until fully seated.
• Do not apply grease unless the bulb manufacturer specifically supplies or requires it.

Step 5: Test the New Bulb

• Keep the taillight supported and away from painted surfaces.
• Switch on the ignition and activate that turn signal.
• Confirm the new bulb flashes brightly and at the normal speed.
• Switch off the ignition and exterior lights before continuing.
• If it does not illuminate, remove the bulb with your gloved fingers, rotate it 180 degrees, reinstall it, and test again.

Step 6: Reinstall the Socket

• Insert the socket into the taillight housing using your gloved hand.
• Rotate the socket clockwise approximately one-quarter turn until it locks.
• Confirm the socket seal sits evenly against the housing.

Step 7: Reinstall the Taillight Assembly

• Align the outer locating pins with their body-mounted retainers.
• Press the assembly straight forward using both hands until it sits flush.
• Start both mounting bolts by hand to prevent crossed threads.
• Use the 10mm socket and 1/4-inch drive torque wrench to tighten both bolts to 5.4 Nm (48 in-lbs).
• Do not overtighten the bolts; the plastic lamp housing can crack.

Step 8: Replace the Opposite-Side Bulb

• Repeat Steps 1–7 on the opposite taillight using the same listed tools.
• Replacing both bulbs together helps maintain equal brightness and reliability.

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✅ After Repair

• ✅ Test the left and right turn signals separately.
• 🚨 Switch on the hazard lights and confirm both rear bulbs flash evenly.
• 👀 Confirm each taillight sits flush and does not move when pressed gently.
• 💧 Check that both bulb sockets are locked to help prevent water entry.
• 🔧 No warning-light reset, coding, or scan-tool procedure is required.

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💰 DIY vs Shop Cost

Shop Cost: ₹1,000–₹2,500 (parts + labor)

DIY Cost: ₹300–₹1,200 (parts only)

You Save: ₹700–₹1,300 by doing it yourself!

Local labor rates vary. This repair takes a shop approximately 0.2–0.5 hour.

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🎯 Ready to get started?

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