Check the connector on side of trans, these are notorious for fluid seeping through the connector and going up harness and in to tcm, if tcm not contaminated replace connecter on trans then recheck... if the fluid is not contaminated it should cure the problem. if fluid is contaminated then it probably an internal problem.
Hope this helps.
SOURCE: I've got a 2005 ML
Hello and welcome to FixYa!
The left headlights have a box connector on the side. It's a harness that is secured with connector from the head light to the computer. The connector may just be failing that's why the light doesn't work. I suggest that you wiggle it a bit or spray a contact cleaner for the connector can be corroded.
Hope this helps and thank you for using FixYa! Have a good one!
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