🔧 Equinox - Taillight Bulb Replacement

You’ll be replacing the rear taillight bulbs in the left and right lamp assemblies on your Equinox. The lamps are held on by a couple of screws and slide-out pins, then the bulb sockets twist out from the back.

Difficulty Level: Beginner | Estimated Time: 0.5–1 hour

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⚠️ Safety & Precautions

• 🔸Make sure the ignition is OFF and the key is removed before starting.
• 🔸Do not work on the bulbs with the lights switched on; they can get hot and you can short the circuit.
• 🔸Avoid touching the glass part of new bulbs with bare fingers; oils can shorten bulb life.
• 🔸Work on level ground with the parking brake set so the vehicle can’t roll.
• 🔸Battery disconnect is not required for this job.

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🔧 Required Tools

You'll need the following tools for this repair:

• 🔸Phillips #2 screwdriver
• 🔸Small flathead screwdriver
• 🔸Plastic trim tool set
• 🔸Shop gloves
• 🔸Safety glasses
• 🔸Clean microfiber cloth

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 🔸Tail/stop/turn bulb (rear combination lamp, 3157 type) - Qty: 2 (replace left and right)
• 🔸Rear side marker bulb (if needed, 194 type) - Qty: 2 (optional, inspect while open)
• 🔸Electrical contact cleaner spray - Qty: 1 (optional)
• 🔸Dielectric grease - Qty: 1 small tube (optional, for bulb contacts)

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📋 Before You Begin

• 🔸Park the Equinox on level ground, set the parking brake, and switch the lights and ignition OFF.
• 🔸Open the rear liftgate fully so you can access the inner edges of both taillight housings.
• 🔸Remove any cargo that might get in your way while working at the rear.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Open the liftgate and locate the taillight screws

• 🔸Stand behind your Equinox with the liftgate open.
• 🔸On each taillight (left and right), look at the inside vertical edge next to the liftgate opening.
• 🔸You’ll see two visible Phillips screws holding each taillight to the body.

Step 2: Remove the taillight retaining screws

• 🔸Use the Phillips #2 screwdriver to remove the two screws from the inner edge of the taillight.
• 🔸Set the screws aside in a safe spot so they don’t fall or roll away.
• 🔸Repeat for the other side if you want to do both at the same time.
• 🔸These screws are small and do not need a torque wrench when reinstalling; snug by hand is enough, about 2–3 Nm (18–27 in-lbs).

Step 3: Release the taillight from the body clips

• 🔸The outer side of the taillight (toward the corner of the vehicle) is still held by plastic locating pins pushed into body clips.
• 🔸Place one hand on the inner edge of the taillight and the other on the outer edge.
• 🔸Gently pull the taillight straight rearward (away from the vehicle), wiggling slightly.
• 🔸Do not pry with metal tools; if it’s stuck, use a plastic trim tool set at the gap to help nudge it backward.
• Pull straight back to avoid breaking pins.

Step 4: Disconnect the wiring harness (if needed)

• 🔸Once the taillight is loose, gently pull it back enough to see the bulb sockets and wiring harness.
• 🔸You can usually leave the harness plugged in and just twist out the bulb sockets.
• 🔸If you prefer more room, press the locking tab on the main connector with a small flathead screwdriver and unplug the harness.

Step 5: Remove the bulb socket from the taillight

• 🔸Identify the main tail/stop/turn bulb socket; it is the larger socket in the assembly.
• 🔸Grip the socket body and rotate it about a quarter-turn counterclockwise.
• 🔸Pull the socket straight out of the taillight housing.
• Check which bulb lights when brakes or lights are on.

Step 6: Remove the old bulb

• 🔸Hold the socket firmly in one hand.
• 🔸Grasp the old bulb with your other hand and pull it straight out of the socket.
• 🔸If it feels stuck, gently wiggle it while pulling.
• 🔸Inspect the socket for signs of corrosion (green/white powder or rust).
• 🔸If corroded, lightly clean with a clean microfiber cloth and, if available, a small amount of electrical contact cleaner spray.

Step 7: Install the new bulb

• 🔸Avoid touching the glass of the new bulb; hold it by the base.
• 🔸If you accidentally touch the glass, wipe it with the clean microfiber cloth.
• 🔸Push the new bulb straight into the socket until it seats firmly.
• 🔸If you have dielectric grease, apply a very thin smear to the metal contacts on the socket, not the glass.

Step 8: Test the bulb before reassembling

• 🔸Temporarily set the taillight close to its normal position so the harness isn’t pulled tight.
• 🔸If you unplugged the harness, plug it back in now by pushing the connector in until it clicks.
• 🔸Have a helper press the brake pedal and turn the parking lights and hazard lights on.
• 🔸Check that the new bulb lights up for tail (dim) and brake/turn (bright) as expected.
• Test now to avoid taking it apart twice.

Step 9: Reinstall the bulb socket and taillight

• 🔸Insert the bulb and socket back into the taillight housing opening.
• 🔸Rotate the socket clockwise about a quarter-turn with your hand until it locks in place.
• 🔸Align the plastic locating pins on the outer edge of the taillight with the holes in the body.
• 🔸Press the taillight straight forward toward the vehicle until you feel the pins snap into the clips.

Step 10: Reinstall and tighten the screws

• 🔸Reinstall the two inner edge screws by hand using the Phillips #2 screwdriver.
• 🔸Tighten them snugly; do not overtighten or you can crack the plastic. Aim for about 2–3 Nm (18–27 in-lbs).
• 🔸Repeat Steps 2–10 on the other side to replace the matching taillight bulb.

Step 11: (Optional) Replace side marker bulbs while you’re there

• 🔸If the small side marker bulb is in the same assembly, remove its smaller socket the same way: twist counterclockwise and pull out.
• 🔸Replace the bulb with a new one of the same type, then twist the socket back in clockwise until it locks.

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✅ After Repair

• 🔸Turn on the parking lights and hazard lights and walk around the rear of the vehicle to verify both taillights and turn signals work.
• 🔸Press and hold the brake pedal (or have a helper do it) and make sure both brake lights are bright and even.
• 🔸Check the reverse lights at night or against a wall if you disturbed any other bulbs.
• 🔸Listen and look for any rattling from the taillight area during a short test drive; that can mean a loose screw or clip.

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💰 DIY vs Shop Cost

Shop Cost: $80–$130 (parts + labor)

DIY Cost: $10–$25 (parts only, for two bulbs)

You Save: $55–$120 by doing it yourself!

Shop labor rates vary but typically run $100–$150/hour. This repair takes a shop approximately 0.3–0.5 hours.

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