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  • toyota4x41 07/29/09 9:00 pm PST

    You need to replace your low beam headlamp relay. It is in the underhood fuse block & is labeled HDM or headlamp module. The relay should be black in color. This is a VERY common failure on all GM vehicles of this type, Ascenders, Rainers, Envoys & Trailblazers all seem to have this problem.

    Source: GM Certified Technician

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