Thanks for posting. Looks like wireless charging only works on 2018 models. This statement from Apple says it all:Official support documentation from Apple with regards to which car manufacturers the iPhone 8, 8+, and most likely the X, will work with.
https://support.apple.com/en-us/HT208148
The implementations of wireless charging in 2017 and earlier models from Buick, Cadillac, Chevrolet, and GMC do not meet the requirements for Qi certification. These models do not work with iPhone 8 and iPhone 8 Plus.
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