Bulb size & fitment reference

Cadillac STS
Bulb Size Guide

Get the bulb-size answer first, then check factory-system differences and position-specific notes before buying.

Select Your Vehicle

Quick Answer for 2011 Cadillac STS

Start with the positions you’re most likely to replace. Full fitment details are below.

Headlight High Beam

Headlight Low Beam

H11 · Halogen Capsule

View this option →

Reverse Light

Courtesy Light

912 / 921 / T15

Shop this position →

Before You Buy: Factory Lighting Can Vary

Your vehicle may use different factory lighting systems. Check the applicable system before ordering.
Halogen bulb example

Halogen

Halogen bulbs are the standard factory bulbs and are easy to replace.

HID bulb and ballast example

HID

HID bulbs provide higher intensity light and require a ballast.

Full Bulb Fitment by Lighting Position

Find the bulb size for each lighting position and check any fitment notes before ordering.

Cadillac STS (2010–2011) Bulb Size Chart

Lighting PositionBulb SizeNoteNext Step
Headlight High Beam9005 / HB3Shop position →
Headlight Low BeamD1SHIDShop position →
Headlight Low BeamH11Halogen CapsuleShop position →
Fog LightH3Shop position →
Daytime Running LightT10 / 194 / 168Shop position →
Front Turn Signal3157 / 3156Shop position →
Parking Light3157 / 3156Shop position →
Reverse Light3157 / 3156Shop position →
License Plate LightT10 / 194 / 168Shop position →
Front Side Marker LightT10 / 194 / 168Shop position →
Rear Side Marker LightT10 / 194 / 168Shop position →
Dome LightT10 / 194 / 168Shop position →
Map LightT10 / 194 / 168Shop position →
Courtesy Light912 / 921 / T15Shop position →
Stepwell Light912 / 921 / T15DoorShop position →
Stepwell LightT10 / 194 / 168StepwellShop position →
Trunk Light211-2 / 578 / 41MMShop position →
View Fitment Options →

Cadillac STS (2008–2009) Bulb Size Chart

Lighting PositionBulb SizeNoteNext Step
Headlight High Beam9005 / HB3Shop position →
Headlight Low BeamD1SV / HID Headlamps · Base / HID Headlamps · PlatinumShop position →
Headlight Low BeamH11Halogen Capsule Headlamps · Base / Halogen Capsule Headlamps · PlatinumShop position →
Fog LightH3Shop position →
Daytime Running Light3157 / 3156Shop position →
Front Turn Signal3157 / 3156Shop position →
Parking Light3157 / 3156Shop position →
Reverse Light3157 / 3156Shop position →
License Plate LightT10 / 194 / 168Shop position →
Front Side Marker LightT10 / 194 / 168Shop position →
Rear Side Marker LightT10 / 194 / 168Shop position →
Dome Light211-2 / 578 / 41MMShop position →
Map LightT10 / 194 / 168Shop position →
Courtesy Light912 / 921 / T15Shop position →
Glove Box Light912 / 921 / T15Shop position →
Stepwell Light912 / 921 / T15DoorShop position →
Stepwell LightT10 / 194 / 168StepwellShop position →
Trunk Light211-2 / 578 / 41MMShop position →
View Fitment Options →

Cadillac STS (2006–2007) Bulb Size Chart

Lighting PositionBulb SizeNoteNext Step
Headlight High Beam9005 / HB3Shop position →
Headlight Low BeamD1SV / HID Headlamps · BaseShop position →
Headlight Low BeamH11Halogen Capsule Headlamps · BaseShop position →
Fog LightH3Shop position →
Daytime Running Light3157 / 3156Shop position →
Front Turn Signal3157 / 3156Shop position →
Parking Light3157 / 3156Shop position →
Center High Mount Stop LightT10 / 194 / 168Shop position →
Reverse Light3157 / 3156Shop position →
License Plate LightT10 / 194 / 168Shop position →
Front Side Marker LightT10 / 194 / 168Shop position →
Rear Side Marker LightT10 / 194 / 168Shop position →
Dome Light211-2 / 578 / 41MMShop position →
Map LightT10 / 194 / 168Shop position →
Courtesy Light912 / 921 / T15Shop position →
Stepwell Light912 / 921 / T15DoorShop position →
Stepwell LightT10 / 194 / 168StepwellShop position →
Trunk Light211-2 / 578 / 41MMShop position →
View Fitment Options →

Cadillac STS (2005) Bulb Size Chart

Lighting PositionBulb SizeNoteNext Step
Headlight High Beam9005 / HB3Shop position →
Headlight Low BeamD1SHIDShop position →
Headlight Low BeamH11Halogen CapsuleShop position →
Fog LightH3Shop position →
Daytime Running Light3157 / 3156Shop position →
Front Turn Signal3157 / 3156Shop position →
Parking Light3157 / 3156Shop position →
Center High Mount Stop LightT10 / 194 / 168Shop position →
Reverse Light3157 / 3156Shop position →
License Plate LightT10 / 194 / 168Shop position →
Front Side Marker LightT10 / 194 / 168Shop position →
Rear Side Marker LightT10 / 194 / 168Shop position →
Dome Light211-2 / 578 / 41MMShop position →
Map LightT10 / 194 / 168Shop position →
Courtesy Light912 / 921 / T15Shop position →
Stepwell Light912 / 921 / T15DoorShop position →
Stepwell LightT10 / 194 / 168StepwellShop position →
Trunk Light211-2 / 578 / 41MMShop position →
View Fitment Options →
Fitment Reminder
Bulb size can vary by factory setup. If you're unsure which option applies to your vehicle, confirm your current bulb or select your configuration on the product page.