🔧 GS350 - Rear Turn Signal Bulb Replacement

You’ll access the rear lamp from inside the trunk, remove the turn-signal bulb socket, and swap the bulb. This is usually quick, but some GS350 rear turn signals are LED (no bulb); in that case, the rear lamp assembly/module is replaced instead.

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

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⚠️ Safety & Precautions

• ⚠️ Turn lights off and let bulbs cool before touching.
• ⚠️ Wear gloves—bulbs can shatter if dropped.
• ⚠️ Support the trunk trim so it doesn’t snap or crease.
• ⚠️ Battery disconnect is not required for a basic bulb swap.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Trim removal tool (plastic) (specialty)
• 10mm socket
• 1/4" drive ratchet
• 6" socket extension
• Phillips screwdriver #2
• Flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Rear turn signal bulb (amber) - Qty: 1 Replace in pairs if both are old
• Trunk trim clip set - Qty: 1 Optional if clips break

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Open the trunk and remove any cargo so you can work comfortably.
• Have a small container ready for clips/fasteners.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Confirm which side and access the lamp area

• Turn the hazard lights on briefly to confirm which rear turn signal you’re replacing, then turn them back off.
• Use a flashlight to locate the access panel/trim behind the rear lamp inside the trunk.

Step 2: Remove the trunk trim/access cover

• Use a trim removal tool (plastic) (specialty) to gently pop out any push-clips holding the trunk side trim.
• If equipped with screws, remove them with a Phillips screwdriver #2.
• Peel back the trunk lining enough to reach the bulb sockets.
• Trim tool prevents scratching and broken clips. (A trim tool is a plastic pry tool made for interior clips.)

Step 3: Remove the rear turn signal bulb socket

• Identify the turn signal socket (usually labeled on the housing; it’s one of the twist-lock sockets).
• Grip the socket and rotate it counterclockwise about 1/4 turn, then pull it straight out.
• If it’s tight, wiggle gently—do not force the wiring.

Step 4: Replace the bulb

• Wear nitrile gloves.
• Remove the old bulb by pulling it straight out of the socket.
• Push the new rear turn signal bulb (amber) straight into the socket until fully seated.

Step 5: Reinstall the socket and test

• Insert the socket back into the lamp housing, then rotate clockwise to lock.
• Turn the hazards on and verify the turn signal flashes at a normal speed.
• If it flashes fast, the bulb may be wrong type, not seated, or that side may be LED-equipped.

Step 6: Reinstall trunk trim

• Reposition the trunk lining.
• Reinstall clips by pressing them in by hand; use the trim removal tool (plastic) (specialty) to align them first.
• Reinstall any screws with a Phillips screwdriver #2.

Step 7 (If your rear turn signal is LED and there is no removable bulb): Replace the rear lamp assembly

• Unplug the rear lamp electrical connector by pressing the tab and pulling straight back.
• Remove lamp retaining nuts with a 10mm socket, 1/4" drive ratchet, and 6" socket extension.
• Carefully pull the lamp straight back to release the alignment pins.
• Install the new lamp assembly and tighten nuts evenly: Torque to 5 Nm (44 in-lbs).
• Reconnect the connector and test the turn signal.

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✅ After Repair

• Verify left and right turn signals, hazards, and brake lights work correctly.
• Make sure the trunk trim is secure and not pinching any wiring.
• Check for moisture inside the lens over the next day; a loose socket can cause leaks.

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💰 DIY vs Shop Cost

Shop Cost: $80-$180 (bulb) / $450-$1,000 (LED lamp assembly)

DIY Cost: $5-$25 (bulb) / $250-$750 (lamp assembly)

You Save: $75-$155 (bulb) / $200-$400 (lamp assembly) 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.