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Why does high beam headlights work on a Chevy trailblazer and the low beam don't?
Wiki User
∙ 12y ago
Perhaps bad bulbs or bad switch
Actually the most common cause of low beam failure on Chevy Trailblazer, GMC Envoy and Buick Ranier is the micro relay located under the hood. It is part number 15016745 and has four prongs. To test if your relay has gone bad locate the relay in your fuse box. There will be two such relays located next to each other. One controls the low beam headlights and the other the cooling fan. Swap the relays and check your low beam headlights. If the low beams work you have a bad relay. Sometimes when the relay goes bad a bulb will burn out as well so if need be check your bulbs. Make sure to swap the relays back so that the cooling fan is not inoperative. Purchase a new relay either online, eBay, auto parts store or dealer. Best deals are usually found online but fastest is the dealer if they have them in stock. Dealer prices aren't cheap, expect to pay $40 to $50, but if you can't wait to have the relay shipped to you it is sometimes your only option. I actually found mine on eBay for $20.
Try online search for "15016745 relay"
Wiki User
∙ 12y ago
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