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OK, I see one thing. There is a ground, W12 is the designator, it's under the center console. It's multi-wired of course. It provides the ground for both of the switches for the seatbelt extender, and for the motor units for the extenders. It seems to have less implications for the reverse lights though. You haven't had any work done in the center console lately, or maybe a aftermarket radio, anything along those lines, or pretty much an untouched car?
I'm not to keen on the fuse I mentioned before being the culprit, but that's the place to start, may end up being a corroded connector on the reverse light switch, but not one that would cause a starting problem. If the circuit is OK up to N7 then thinking it could be N7 itself.
Gilly
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