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If you know headlight is 2 years old only, swap the ecu.  Do not assume it is ok.  Proper troubleshoot will allow to look at all aspects, no matter how unlikely.

If you swap out ecus left to right, and drive and the other headlight starts acting up, you just found out ecu is bad without having to spend couple hundred bucks on a new one for a guess.

Dont give up, you will get it.  Good job.

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Tested another xenon headlight that was known to work, issue remains. Put back in the old harness wiring to test that, problem remains.

 

Nothing to do now but let the stealership look at it.

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The burnt contacts are a result of poor contact with the receptacle socket.

The solution is to modify the plastic headlight plug holding bracket on the vehicle side.

You cut off the ends of the retaining bracket with a Dremel allowing the electrical plug to be free from the holding bracket.

You then manually insert the plug into the headlight upon installation and manually remove it when you remove the headlight.

I modified mine 8 years ago and have never had a problem again with the turn signal or any other type of headlight message.

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