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Drew: My 2007 9-5 has a headlight problem(s): the left one flickers intermittently and the right one occasionally goes dark and then recovers shortly thereafter. In a post with a one-sided problem you advised that the owner switch the "ecu" to the other headlamp. I wanted to try the same but since the headlight assembly is not easily accessed I thought I would replace both of them. However, I can't find a source. The only name for "ecu" I can find is Engine Control Unit which I doubt is just for the headlights. My ALLDATAdiy.com Leading Source of Factory Automotive Repair Information does not list an "ecu." Can you straighten me out?