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E90/E91/E92/E93 (2006 - 2013)
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Old 06-23-2017, 01:58 PM
newDIYer newDIYer is offline
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Location: NJ
 
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Mein Auto: 2007 BMW 328i
Turn signal malfunction...anyone else?

Hey all,

I have an '07 328i w/ 115k miles on it (auto). My front left turn signal does not work. I thought it was a burned out bulb so I took it out but it was fine. After researching a little, I found out if the metal part was burnt or corroded that i can shave it off with a knife so that there will be more contact. Mine wasn't the case but still did it anyways with no luck. So I bought some bulbs and replaced it and WHOA! it worked! BUT 2 days later, that fresh new bulb stopped working. I took it out and examined it and nope, not burnt out. I stuck it back in and it came back to life randomly while I was driving for about 10 minutes and then after that it just died again...

What is the problem with this? All other lights work fine.

Thanks in advance!
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Old 06-23-2017, 02:31 PM
MIASMABimmer MIASMABimmer is offline
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Location: Hillsboro, OR
 
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Mein Auto: 2007 328xi
Check your fuses or wiring for the light.

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Old 06-23-2017, 09:57 PM
gbalthrop gbalthrop is online now
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Location: Fairfax County, Virginia
 
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Mein Auto: 2007 328xi
Turn Indicator Fault Diagnosis

Quote:
Originally Posted by newDIYer View Post
I have an '07 328i...My front left turn signal does not work[?]. I thought it was a burned out bulb so I took it out but it was fine...So I bought some bulbs and replaced it and WHOA! it worked! BUT 2 days later, that fresh new bulb stopped working. I took it out and examined it and nope, not burnt out. I stuck it back in and it came back to life randomly while I was driving for about 10 minutes and then after that it just died again...All other lights work fine.
QUESTION:

Do BOTH (1) the turn indicator bulb under the headlight lens, AND (2) the "repeater" indicator located on the front fender, just in front of the driver door, NOT work, or does that "repeater" work?

So TWO (2) different bulbs in the left headlight lens indicator socket quit working, and upon removal, each of those two bulbs that had quit working were found to be OK??? 2nd bulb even worked when reinserted to same socket???

Only conclusion I can reach is that you have an intermittent connection or improper contact either (1) in that socket itself, or (2) in the Blue/Green wire that furnishes 12V+ to pin 12 of that socket connector, or (3) in the Brown ground wire at pin 4 of the socket connector.

See the Turn Signal Indicator Wiring diagram in the Bentley Service Manual, at pdf page 1172 of the pdf for Sedan & Wagon, or at page 1173 for Coupe & Convertible:
http://www.georgebelton.com/335i.tech/bentley.php

The lamp socket is grounded via the Brown wire at pin 4 of the socket connector that connects to a multiple-wire ground connector (X165) which you will find on the inboard side of the Left Front wheel well, just below the bracket with two bolts that holds the air filter housing to the chassis.

There is no single fuse that supplies power ONLY to the left front turn indicator bulb, so if all other turn indicator lamps light, the problem is NOT a fuse, but rather in the wiring. Of course the ground connection, is just as important as the 12V+ power supply, so check BOTH (1) 12V+ at pin 12 of the lamp socket connector (Blue/Green wire) and also for (2) continuity to ground at pin 4 (Brown wire).

Obviously check for any corrosion in the socket where the bulb base is grounded, as well as at the bulb (+) contact point, and also check for any loose wires or damaged insulation.

BTW, do you have a Check Control warning on your lower instrument cluster, and if so check for any CC-ID per the "Check Control" procedure in your Owner's Manual.

Please let us know what you find,
George

Last edited by gbalthrop; 06-23-2017 at 09:59 PM.
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