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post #1 of 4 (permalink) Old 07-14-2012, 07:55 PM Thread Starter
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Left Front Turn Signal

2009 Cobalt -- brought in Sept of 2008
Okay here is what happened --
1) friend brought their car over because they were not able to replace the bulb in the front right turn signal -- I figured that out and replaced the bulb.
2) being the good friend I am, I checked to make sure the left front worked also --- it didn't
3) replaced the left front bulb and the running light comes on but the turn signal doesn't flash in the front --- the left rear flashes fast like a burned out bulb
4) I do normal trouble shooting and find voltage to the turn signal portion of the left socket, but it is not flashing on and off like the right trun signal does when activated.
5) I checked the ground portion of the socket with an ohm meter and it reads as a complete ground -- I am using the bolt on the strut tower on the left side labeled ground.
6) rechecked the bulb and it shows a complete circuit through the system.

What am I missing ?

Last edited by OwnerofHarriet; 07-14-2012 at 07:59 PM.
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post #2 of 4 (permalink) Old 07-14-2012, 08:16 PM
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Which bulb did you use 3057KX or 3157KX? Some people mix these up!

---------- Post added at 11:16 PM ---------- Previous post was at 11:15 PM ----------

Back-Up Lamps
921

Center High-Mounted Stoplamp (CHMSL)
912

Front Parking/Turn Signal Lamps
3157KX


Halogen Headlamps, High/Low-Beam
9007 LL

License Plate Lamp and Sidemarker
194

Stoplamp, Taillamp and Turn Signal Lamps
3057KX

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Last edited by Coby7; 07-14-2012 at 08:24 PM.
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post #3 of 4 (permalink) Old 07-14-2012, 08:34 PM Thread Starter
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I used 3357A/3457A bulbs

The right side works ---

the left doesn't light or flash and there is voltage on the turn signal side of the socket when checked with a volt meter and test light -- however it does not pulsate
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post #4 of 4 (permalink) Old 07-14-2012, 09:20 PM
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Yeah sorry they would just be different in brightness anyway. You won't see the blinker voltage change unless you have a load. My guess is a bad contact from socket to bulb. Make sure the folded wires on the bulb are in the right spot in alignement with the socket contacts. Sometimes these are bent out of place in handling.

---------- Post added 07-15-2012 at 12:20 AM ---------- Previous post was 07-14-2012 at 11:43 PM ----------

As you can tell unlike older cars the cobalt has a separate driver for front and rear bulbs.


Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

Never drive faster than your guardian angel can fly
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