🔧 RX350 - Taillight Bulb Replacement (Both Sides)

On your RX350, the “taillight” area includes a few different lights. The most common replaceable bulbs are the rear turn signal and sometimes the reverse; the tail/brake light is typically LED and not a simple bulb replacement (it requires replacing the lamp assembly if it fails).

This guide shows how to replace the left + right rear turn signal bulbs, which is what most people mean by “both taillight bulbs.”

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

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⚠️ Safety & Precautions

• ⚠️ Turn the ignition OFF and switch all exterior lights OFF before starting.
• ⚠️ Let the bulbs cool for 5-10 minutes; they can get hot.
• ⚠️ Wear gloves; skin oil can shorten bulb life.
• ⚠️ Support the liftgate securely if you’ll be working near it.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Flashlight
• Trim panel removal tool (plastic)
• Small flathead screwdriver

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Rear turn signal bulb (7440A amber) - Qty: 2

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📋 Before You Begin

• Park on level ground and shift to P.
• Open the rear liftgate and remove cargo so you can access the side panels.
• Do a quick check: turn on hazards and confirm which side(s) are out, then turn everything OFF.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Open the access door in the cargo area (left side)

• Use a flashlight to locate the small access panel/door behind the taillight area on the left side of the cargo trim.
• Use a trim panel removal tool (plastic) to gently pop the access door open.
• If there’s a tight clip, use a small flathead screwdriver carefully and pry a little at a time. Go slow to avoid breaking clips.

Step 2: Remove the turn signal bulb socket (left side)

• Reach through the access opening and find the bulb socket for the turn signal.
• Grip the socket and rotate it counterclockwise about 1/4 turn, then pull it straight out.
• If it feels stuck, wiggle while pulling—don’t yank on the wires.

Step 3: Replace the bulb (left side)

• Wear nitrile gloves before handling the new bulb.
• Pull the old bulb straight out of the socket.
• Push the new 7440A amber bulb straight into the socket until fully seated.

Step 4: Reinstall the socket and test (left side)

• Insert the socket back into the housing and rotate it clockwise to lock.
• Turn the ignition ON and turn on the left turn signal to confirm it flashes normally.
• Turn the ignition OFF after the test.

Step 5: Repeat on the right side

• Move to the right cargo-side access panel and use the same process with the trim panel removal tool (plastic).
• Remove the socket by turning counterclockwise, replace the bulb, then reinstall by turning clockwise.
• Test the right turn signal to confirm normal flash speed.

Step 6: Refit the access doors

• Snap the access panels/doors back into place by pressing evenly with your hands.
• Make sure the trim sits flush and nothing is pinched.

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✅ After Repair

• Turn on hazards and walk around to confirm both rear turn signals flash evenly.
• If the new bulb still doesn’t work, the socket may not be fully locked—remove and reinstall it.
• If your tail/brake light is out (not the blinking turn signal), it’s usually an LED lamp assembly issue, not a bulb.

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💰 DIY vs Shop Cost

Shop Cost: $60-$150 (parts + labor)

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

You Save: $50-$120 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.

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Quick check (2 questions so I can match this exactly):

• Which light is out: turn signal, reverse, or brake/tail?
• Is it the outer lamp on the body, or the inner lamp on the liftgate?