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Buick LaCrosse Tail Light Bulbs Replacement Guide
How to change a burnt out rear turn signal or reverse bulb in the tail lights of a 2nd generation 2010-2016 Buick LaCrosse.

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2016 LaCrosse Tail Light
Round Plastic Fasteners
Pry Out Pop Rivet
This automotive maintenance tutorial was specifically written to assist owners of the second generation (2010, 2011, 2012, 2013, 2014, 2015 & 2016) GM Buick LaCrosse sedan in changing a burnt out rear turn signal or reverse bulb in the tail light housings.

Owners of other General Motors vehicles such as the Chevrolet Impala, Monte Carlo, Malibu, Spark, Sonic, Cruze, Volt, SS, Camaro, Caprice, Corvette, Trax, Equinox, Traverse, Tahoe, Suburban, Colorado, Silverado, Buick Verano, Regal, Cascada, Encore, Enclave, Envision, GMC Canyon, Sierra, Terrain, Acadia, Yukon, Savana, Cadillac CT6, ATS-V, ATS, ELR, CTS, XTS, XT5, SRX, Escalade and Holden Commodore may also find these DIY instructions to be helpful.

The replacement bulb part numbers are as follows: Rear Turn Signal # 7440A (or WY21W) and Reverse # 921 (or W16W).

The tools you may need to complete this procedure include a pop rivet removal tool, a pair of needle nose pliers and a plastic automotive panel pry bar tool.

Remove Plastic Pop Rivet
Pull Out 2nd Pop Rivet
Pull Back Trunk Liner
The first two steps are to open the trunk and then move to the side of the car with the burnt out tail light bulb.

Locate the two small round black plastic pop rivets or "Christmas Tree" fasteners that secure the carpeted trunk liner in place.

Pry out the fasteners with a pop rivet removal tool or you can use a pair of needle nose pliers to pull them out.

Set the two pop rivets aside in a safe place.

Gently peel back the trunk liner to expose the tail light housing fasteners.

Black Plastic Thumb Nut
Housing Thumb Nuts
Twist Off Counterclockwise
The tail light housing is held in place by four black plastic thumb nuts.

Remove the thumb nuts by turning them counterclockwise.

Buick-LaCrosse-Tail-Light-Bulbs-Replacement-Guide-010 Buick-LaCrosse-Tail-Light-Bulbs-Replacement-Guide-011 Buick-LaCrosse-Tail-Light-Bulbs-Replacement-Guide-012
Outer Corner Thumb Nut
Set the four thumb nuts aside in a safe place.
2 Pop Rivets & 4 Thumb Nuts
Gently Pry Along Outer Edge
Tail Light Assembly Removed
Try to pull the tail light housing straight off the rear corner of the car.

If you have trouble removing the housing, use a plastic pry bar tool along the outer edge.

Turn over the tail light assembly to access the bulb sockets.

1/4 Turn Counterclockwise
Turn Signal Light Bulb Socket
Pull Out Old Light Bulb
Rotate the tan colored plastic rear turn signal bulb socket 1/4 turn counterclockwise to remove it from the housing.

Pull the old bulb straight out of the socket.


Push In New 7440A Bulb
1/4 Turn Clockwise - Lock
Reverse Light Bulb Socket
Push a new amber colored # 7440A bulb straight in to the socket.

Re-insert the socket in to the housing and rotate it 1/4 turn clockwise to secure it in place.

1/4 Turn Counterclockwise
Pull Out Old Light Bulb
Push In New # 921 Bulb
Rotate the smaller grey plastic reverse light bulb socket 1/4 turn counterclockwise and pull it out of the housing.

Pull the old reverse light bulb straight out of the socket and push in a new # 921 bulb.

If you would like to have brighter reverse lights for extra safety, consider using a 921 LED bulb.

1/4 Turn Clockwise - Lock
Line Up Bolt Threads
Push On Tail Light Housing
Re-insert the reverse bulb socket in to the housing and rotate it 1/4 turn clockwise to secure it in place.

Line up the bolt ends on the back side of the tail light assembly with their corresponding holes in the rear corner of the vehicle.

Gently push the tail light housing back in to place until it is flush with the metal body panels.

Spin On Thumb Nuts
Tighten Clockwise
Replace Thumb Screws
Move to the inside of the trunk and spin on the four black plastic thumb nuts in the clockwise direction.

Tighten the thumb nuts until they are snug.

Try to avoid over tightening the thumb nuts to prevent from cracking or damaging the plastic tail light assembly.

4th Thumb Nut Replaced
Replace Trunk Carpet
Push In Pop Rivets
Push the carpeted trunk liner panel back in to place.

Push in the two black plastic pop rivets to secure the trunk liner.

Secure Trunk Liner
Trunk Liner Replaced
Test New Tail Light Bulbs
Test the new tail light bulbs by having someone step on the brake pedal, activate the hazard signals and place the transmission in reverse.

For more, check out my other 2010-2016 Buick LaCrosse DIY Repair & Maintenance Guides.

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