They're is generally no need to be that cautious in such circumstances. Working around the distinctively orange clad SRS wiring harnesses is generally safe as long as you're reasonably careful and don't expose the wiring inside such that you risk damaging the insulation and exposing bare wire. Even then the bare wire would have to be subject to a short or significant static voltage for anything to happen. Having said that then of course if you lack the confidence to do that then absolutely disconnect the battery negative terminal and tuck it safely out of the way. When actually working on the air bag systems, there's a second rule of thumb to avoid keeping your head out of the line of fire if an air bag should every happen to deploy for whatever possible reason.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now