🔧 CX-9 - Taillight Bulb Replacement

On your CX-9, the outer rear lamp housing contains serviceable bulbs for the rear turn signal and reverse light (depending on equipment). The brake/tail (running) light is typically LED and not a replaceable bulb—if that LED section is out, the fix is usually replacing the lamp assembly.

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

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⚠️ Safety & Precautions

• ⚠️ Turn the ignition OFF and switch all lights OFF before starting.
• ⚠️ Let bulbs cool if they were recently on (they get very hot).
• ⚠️ Wear gloves and don’t touch a new bulb’s glass with bare fingers (skin oil can shorten bulb life).
• ⚠️ Support the lamp as you pull it out so you don’t scratch paint.
• Battery disconnect is not required for this job.

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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
• Needle-nose pliers
• Work gloves
• Safety glasses
• Clean microfiber towel

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Rear turn signal bulb (7440) - Qty: 2
• Reverse light bulb (921) - Qty: 2

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📋 Before You Begin

• Park on a level surface and set the parking brake.
• Open the liftgate and remove any cargo so you can access the rear side panels.
• Place a clean microfiber towel on the bumper corner under the lamp area to protect paint.
• Tip: Replace bulbs in pairs for matching brightness.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Access the taillamp fasteners

• Use a plastic trim removal tool to pop open/remove the small access cover behind the taillamp area inside the cargo opening (left side for left lamp, right side for right lamp).
• If a plastic clip is in the way, use the plastic trim removal tool to pry it out gently.

Step 2: Remove the taillamp retaining nuts

• Use a 10mm socket, 1/4" drive ratchet, and 6" socket extension to remove the taillamp retaining nuts.
• Put the nuts somewhere safe so they can’t fall into the body.

Step 3: Pull the taillamp assembly outward

• With one hand supporting the lamp, pull the taillamp straight rearward to release the alignment pins (they’re tight, but it should pop free).
• If it’s stuck, use a plastic trim removal tool at the edge and gently wiggle—do not pry hard on painted surfaces.

Step 4: Remove the bulb socket(s)

• Twist the bulb socket counterclockwise by hand to remove it from the lamp.
• If it’s tight, use work gloves for grip. If needed, use needle-nose pliers very gently on the socket tabs (don’t crush the plastic).
• Tip: Take a quick photo before removal.

Step 5: Replace the bulb

• Pull the old bulb straight out of the socket by hand using work gloves.
• Install the new bulb by pushing it straight into the socket until fully seated.
• Wipe the bulb with a clean microfiber towel if you accidentally touched the glass.

Step 6: Reinstall bulb socket(s) and test

• Reinstall the socket into the lamp and twist clockwise until it locks by hand.
• Before bolting the lamp back on, test the light:
  • Turn signal: switch the turn signal ON.
  • Reverse bulb: key ON, shift to Reverse while holding the brake (have a helper, or use a safe method).
• If a bulb doesn’t work, remove it and rotate/reseat it, then re-test.

Step 7: Reinstall the taillamp assembly

• Align the lamp’s locating pins with the body grommets, then press the lamp straight in until it sits flush.
• Reinstall the retaining nuts using a 10mm socket, 1/4" drive ratchet, and 6" socket extension.
• Torque to 7 Nm (5 ft-lbs)
• Reinstall the interior access cover using the plastic trim removal tool as needed.

Step 8: Repeat on the other side

• Do the same steps on the other rear lamp so both sides match.

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✅ After Repair

• Verify left and right turn signals flash normally (not “hyper-flashing”).
• Verify reverse lights work on both sides.
• Check the lamp sits flush and there are no gaps (helps prevent water leaks).
• Tip: Recheck function after a short drive.

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💰 DIY vs Shop Cost

Shop Cost: $90-$200 (parts + labor)

DIY Cost: $10-$40 (parts only)

You Save: $50-$160 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.