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Hi all, just to note that I wired up a dashcam today and removed the A-pillar cover on a 2018 Jazz to confirm exactly where the airbag is located. As shown in both photos, the airbag is not entirely contained within the headliner, nor is it entirely contained within the A-pillar. Instead, it extends across both. Therefore, routing the cable across the edge of the headliner using the OP's routing to get to the door trim means that the cable goes right over the airbag, obstructing deployment. To have a safe setup where the cable is entirely hidden, the cable needs to follow the existing electrical wiring at least until it clears the airbag itself. Personally I routed it as shown in the second picture (also worth noting that I disconnected the battery first)
Nice job. I installed two separate fuse blocks in my Fit. One is powered directly y the battery, so power is always available. The other is powered by the car's fuse box. That's where I connected the dash cams. Instead of removing panels, I pressed with wire into the gap between the panels. I have Vioffo cameras front and rear. It's easy running the wire under the panels along with all the wires that run to the rear. I also installed a 12v power outlet in the rear.