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Stuck trailer brake relay!
My 2013 Suburban LTZ hads the "Service trailer brake system" light on the dash. Traced the problem to the relay. I located it just in front of the spare tire. To get to the 10 mm bolts that secure it, you have to remove three star/torx bolts in order to slide the controller out of the way. When...- AZPatriot1963
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- Forum: Suburban / Yukon XL / Escalade ESV
