need help on park assist issue

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Ont240

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o7 Tahoe park assist needs service. Dealer said it was left sensor , so i replaced it. still not working. finally decided to get 4 new off ebay with the exact same # as mine was. Took bumper cover off,replaced all 4. still not working. displays service park assist. In reverse the red light only displays. The cancel switch on the cluster seems to be lit all the time. if I press it, there are 4 blinks then steady on. The bumper harness is ok for continuity on all 4 plugs.
Does anyone know how the assist switch is mounted or how to remove?
Thanks
ps.Voltage on blue wire is 8.38 v anytime the gear is in reverse
 
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Ont240

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does anyone know what the signal voltage should be?
 
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