To ensure reliability, purchase GM part # 20777892 Headlight Automatic Control Module Assembly. It is sometimes referred to as Cadillac Body Control Module, Cadillac Light Control Module. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Cadillac CTS models.
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