I must say I failed big with OEM front sensor retrofit.
My car is Mazda 3 HB BN 2017 with already-fitted rear sensors and visual representation.
My module is GMC8-67UU0
My harness is pretty weird (not the same as BM - my connector is way bigger but I was able to identify 10V pins for front sensors)
That means my harness is full - when I disconnect them got errors the circuit is shorted to ground or opened - I believe that means the wiring is fine).
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I tried to change only bits 720-04-16 B2 b3:0 b2:1 as my vehicle is fitted with FSC2
and then I'm losing completely the whole parking sensor system. No more overlay on the MCU and the beeper is not working too. No PID's. Whole system is dead but... NO DTC.
Is there any other place responsible for front parking sensors? That is very weird why after front activation my rear is gone. I wasn't able to see the front layout at all.
Also, I added an activation button (whole panel with heated seat control - I wasn't able to see it working at all) changing bits b3b2 for fsc1 options throwing Invalid configuration - I believe 01 is the only correct option (originally 00)
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got an extra question: as I put my front back (I need a working car to survive) can I still play with asbuilt without front sensors connected?)