so you have had a dent and paint job where about on the vehicles would narrow the problems maybe a disturbed connector unattached earth damaged or trapped harness a fuse blown or dislodged
that the problem most of my images are around 3Mb and I'm unable to post them .the one's I post are re-sized and then further resized by the site in some cases view them in windows paint (as they are created in paint in PNG format as the colors don't bleed)
The firing order is the same for the 3.5 and 3.9 (changes when fitted in the Range Rover )your set up is one position out from the reference point but the firing order is still 1,8,4,3,6,5,7,2 so is correct but your marking are out
try https://www.europeanservicecenter.com/4-reasons-why-your-land-rovers-airbag-warning-light-is-on-in-atlanta/ I believe the battery safety unit is like the BMW and fires a charge to disconnect some of the battery outputs in the event of a crash leaving the hazards and other critical systems...
Sumitomo Header used on most land rover models blue 6,4 ,6, 4 20 way male (64000014 ) and female (64090073),they separate to isolate the spliced cable affectively a means of joining harness cables in a 6,4,6,4 configuration. The grey is 8,4,8