Hi Sandy,
Prior to me fitting it I found a really useful link from a mainly US Lexus forum, its really good and pretty much summarizes all that needs to be done. It took me around 2 hours to fit and I routed the cable along, into and through to roof lining which was really easy. The cables need to be ran immediately behind the linings so that they don't interfere with airbag deployment but thats all you need. Couple of things I done differently:
1. I ran the rear camera cable from the front to the back and coiled up the excess cable in under the tailgate moulding panel.
2. I did not take the A Frame pillar moulding off, there’s plenty of room behind the door pillar rubber door seal arrangement and this avoids interfering with the A pillar airbag. The cables are easily tucked between the headlining and A frame plastic cover.
3. I used the tailgate grommet that is used to route the washer fluid pipe, there’s much more room for the camera cable (some washing up liquid helps to pass it through).
4. I used a stripped out cable (live or neutral) from some 2.5mm twin and earth ring main domestic type to act as a router / pull through. Just some care not to disturb any trim or internal wiring etc. Any stiff rodding will do but this made it easy as its quite flexible too.
All the panels came apart easily and as long as your careful nothing should break, worst that could happen is for one of the plastic facia clips to break which are easy to replace. The Nextbase camera came with a small plastic tool which is helpful to remove mouldings and prize away roof lining etc to enable the cables to be snuggly fitted in.The power supply is from a piggy back connector fitted to the auxiliary fuse system which only powers up when the car is being used, I bought the additional cabling which included everything for the install Only thing is that the fuse cover can’t be refitted due to the size of the piggy back, I just left it off. I’ll add a couple pics re-positioning but its to the left of the rear view mirror and just below the safety camera, it does not interfere with driving, in fact you don’t notice it’s even there. The cables run in the channel and into the headlining so it’s completely hidden.
See link below:
https://www.clublexus.com/forums/ux-models-2019-present/960258-dash-cam-progress-thread-viofo-a129-duo.html?utm_source=LexusOwnersClubUK&utm_medium=ForumLinks&utm_source=LexusOwnersClubUK&utm_medium=ForumLinks