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Side markers come on with tail lights on first click of rotary light switch. There is no DRL sensor. DRL come on when You put your car into drive.
 

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You mean the dusk to dawn sensor. Yes thats that dark redish bulb looking thing-a ma-bob on the top of the dash.
 

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Yea that's the case for automatic mine come on when i release the e-brake
I think the e-brake also turns the DRL's off with the automatic. I'm going to have to try this???
 

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I don't know if this has ever been posted, but I thought it might be helpful...

2007 CHEVROLET Cobalt Lighting Chart

High & low beam headlamp

9007
9007SU Silverstar ULTRA for Ultra Night Vision - The Whitest and Brightest Halogen
9007ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
9007EB EcoBright - Your Environmental Choice
9007XV XtraVision Halogen - The Brighter Light
9007CB Cool Blue Halogen - The Whiter Light

Parking light
3157LL

Front turn signal
3157LL

Rear turn signal
3157LL

Tail light
3157LL

Stop light
3157LL

High mount stop light
912
912LL Long Life Upgrade: Up to twice the life of the standard lamp

Fog/Driving light
H11
H11ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
H11XV XtraVision Halogen - The Brighter Light

License plate
194
194LL Long Life Upgrade: Up to twice the life of the standard lamp

Back up light
921
921ST Silverstar Signal Lighting: Complete the Look: Crisp, Clean, Style
921LL Long Life Upgrade: Up to twice the life of the standard lamp

Front sidemarker

194
194LL Long Life Upgrade: Up to twice the life of the standard lamp

Rear sidemarker
194
194LL Long Life Upgrade: Up to twice the life of the standard lamp

Map light
2825LL

Dome light
562

Step/Courtesy light
212-2

Trunk Light

194




The above info is for a 2007 Cobalt...I think they are all the same, but here is the catalog link to look up your particular year (or any other vehicle):

OSRAM SYLVANIA - Replacement Guide - Start
Good looking ou ton this chart bro helped me out
 

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9007XV XtraVision Halogen - The Brighter Light

Let me know if anyone is looking for these, I have projectors and my dumb ass bought these bulbs and since i opened them I can't return them.
 

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I bought a blue led dome light from superbrightleds.com...not a bad light. really nice color. id like to get one for my trunk on my '10 LT but im not sure which bulb to get. Ill check out that list, but if anyone knows offhand that would be awesome! :)
 

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A 194 Led light should fit in there. All the specs of the light are on the first post.
 

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yeah i suppose i should go back and read a little more before i start asking questions, but thanks for the info
 

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No problem make sure to post a pic of it when you do it! we like picturrzz
 

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Will post pics when its done, ill probably order it tomorrow :) And i do not have courtesy lights as far as i can tell.
 

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Here's what I did for my trunk light...

 

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Thats nice! you dont see that every day! i like the more subtle look though :p
 

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You can't see it unless you get in the trunk. It lays in a channel that seems to have been made just for this.
 

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Gotcha yeah i see that now, i had some issues figuring out where it was when i first looked, ITS SO DARK :p
 
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