🔧 GLA - Rear Turn Signal Bulb Replacement

Your GLA’s rear turn signals are inside the tail lamp assembly. The bulb is replaced by removing the tail lamp from the body, then swapping the correct bulb in the lamp’s bulb carrier.

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

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⚠️ Safety & Precautions

• ⚠️ Turn the light switch OFF and remove the key/fob from the vehicle.
• ⚠️ Let the bulbs cool before touching them; they can get very hot.
• ⚠️ Use gloves to keep skin oils off bulbs (helps prevent early failure).
• ⚠️ Protect paint edges around the tail lamp with tape to avoid scratches.
• ⚠️ Battery disconnect is not required for this bulb replacement.

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🔧 Required Tools

You'll need the following tools for this repair:

• 8mm socket
• 1/4" ratchet
• 3" extension
• Plastic trim removal tool
• Small flat-blade screwdriver
• Painter’s tape
• Flashlight
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Rear turn signal bulb - Qty: 1
• Tail lamp seal/gasket (if damaged) - Qty: 1

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Open the rear hatch and remove any cargo that blocks the tail lamp area.
• Apply painter’s tape along the body edge next to the tail lamp to protect the paint.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Access the tail lamp fasteners

• Open the hatch and locate the tail lamp access cover on the inside trim near the lamp.
• Use a plastic trim removal tool to gently pop off the access cover.
• If a clip is stubborn, use a small flat-blade screwdriver carefully at the edge. Go slow to avoid breaking clips.

Step 2: Remove the tail lamp nuts

• Use an 8mm socket with a 1/4" ratchet and 3" extension to remove the tail lamp retaining nuts.
• Place the nuts somewhere safe so they don’t fall into the trim.
• Torque to 5 Nm (44 in-lbs) during reinstallation (snug, not tight).

Step 3: Remove the tail lamp assembly

• With the nuts removed, hold the tail lamp with both hands.
• Pull the tail lamp straight rearward (toward you) to release it from the locating pins.
• If it feels stuck, wiggle gently—do not pry against the painted body.

Step 4: Disconnect the electrical connector

• Locate the tail lamp wiring connector on the back of the lamp.
• Press the locking tab and pull the connector off by hand.
• Use a flashlight to see the lock clearly.

Step 5: Remove the bulb carrier (bulb holder)

• The bulb carrier is the plastic plate on the back of the tail lamp that holds the bulbs.
• Release the carrier locks (tabs) by hand; if needed, use a small flat-blade screwdriver gently on the tabs.
• Lift/pull the carrier out of the tail lamp.

Step 6: Replace the rear turn signal bulb

• Identify the turn signal bulb position (usually the amber bulb socket location in the carrier).
• Wear nitrile gloves, then remove the old bulb by pulling it straight out of the socket.
• Install the new rear turn signal bulb fully into the socket (push straight in until seated).

Step 7: Test before reassembly

• Reconnect the tail lamp electrical connector by hand.
• Turn the ignition ON and switch the turn signal on that side.
• Confirm proper operation and normal flash speed (fast flashing can mean a bulb isn’t seated).

Step 8: Reinstall the bulb carrier and tail lamp

• Disconnect the connector again (optional but makes installation easier).
• Reinstall the bulb carrier into the tail lamp until the tabs click into place.
• Reconnect the electrical connector until it locks.
• Align the tail lamp locating pins and push the lamp straight into position.
• Install the nuts using the 8mm socket and 1/4" ratchet, then Torque to 5 Nm (44 in-lbs).

Step 9: Refit the trim access cover

• Press the access cover back into place by hand.
• Remove the painter’s tape from the body.

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✅ After Repair

• Test left and right rear turn signals, hazards, brake lights, and tail lights.
• Check that the tail lamp sits flush with the body and there are no gaps.
• If you see moisture inside the lamp later, replace the tail lamp seal/gasket.

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💰 DIY vs Shop Cost

Shop Cost: $80-$180 (parts + labor)

DIY Cost: $5-$25 (parts only)

You Save: $55-$175 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.