Buick Lacrosse Fires Caused by Faulty HDM Module?

During a recent investigation, it was learned that there have a number of complaints (posted on–line) concerning the inadvertent failure of headlights in Buick Lacrosse vehicles. The vehicle that we were working on was a 2009 year model but, the problem is apparently in 2007 year models as well. Basically, the complaint centers on drivers noticing that their headlights are going out for no reason while driving at night. Sometimes the headlights will come back on. The problem is not as noticeable during the day if the headlights are also used as day running lights. In the case that was investigated, a small fire erupted in the fuse block and specifically the HDM (Headlight Drivers Module) module. As a result, the wiring harness that is connected to the HDM module was also damaged and had to be replaced. It was later learned that headlight failure was also a symptom that had occurred at an earlier time. Although the National Highway Traffic Safety Administration (NHTSA) has recorded 13 complaints regarding 2009 Buick Lacrosse Vehicles, four complaints are directly related. As of the date of this blog entry, no recall for the HDM modules has been issued by NHTSA or General Motors.

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