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Backup lights don't come on 2007 avalanche. No power to fuse underhood, but they come on when power is jumped to fuse 15

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  • Cars & Trucks Master
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Note the wiring diagram, the relay has to be energized before the fuse will get voltage. The load side of relay is that line with arrow head, when the relay is energized that line moves to other terminal and voltage goes to the fuse. Voltage to load side of relay is hot all the time. The control side of relay is left side in the diagram, has to have voltage and ground. Ground is a constant ground, voltage comes from bcm. Your neutral switch is part of this.
backup lights don't come on 2007 avalanche.  No po - back up 1-0103vjq2xqhyauegtcci2npk-3-0.jpg

back up 2-0103vjq2xqhyauegtcci2npk-3-2.jpg

Posted on May 01, 2017

Testimonial: "So the BCM or the relay is bad? is the rilay removable or a permanent one? It's a new BCM, but could have a broken wire ."

  • jack layton
    jack layton May 02, 2017

    The relay looks to be permanent. My first thought isn't the bcm, I'd have to check the neutral switch. Yes, there could be a wiring problem?

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