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Rear defrost stopped working. Button and fuse are good as mirrors still working. All the window wires look good, so thinking it has come loose or wire connector is bad. Before I start pulling trim loose wanted to see if someone can tell me where the main wire connects to the grid. Thanks
 

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I would likely start with seeing if current is still getting to the terminals at the rear window.
 

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There are fuses and relay(s) beyond just the button, which only controls switching power. Can't speak specifically to your 2015 but some vehicles have as many as 4 fuses involved in the circuit. Consult your owners manual for their ratings and location(s)
 

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The wire it going to be under the C-Pillar plastic trim. But all you need to do is take a voltmeter and touch the leads to the grid itself. One probe on the left side of the grid, and one on the right. Be sure to have a steady hand, you dont want to scratch, and potentially break, the trace path.
 
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