Air Bag Not Deploy problems of the 2008 Lexus IS250

As inspected by Lexus dealership in woodland hills CA, my car has airbag light on/off intermittently. Error code b1861 was found that is tied to knee airbag on the driver side. There is a problem with the squib circuit in the instrument cluster I believe. Car has around 99k miles but this safety concern is serious. This airbag is something that never gets used unless you're in an accident. I've never been in one. It is just bad workmanship on Lexus to install such a wiring harness and squib circuit that'll go bad before 100,000 miles. As a customer this is not something that is visible to me nor something I would attempt to touch. It is hidden behind the instrument cluster and dashboard. Dealership quoted $3000+ to fix something that wasn't caused due to customer negligence. It is just bad workmanship from Lexus. There is a great risk involved with driving Lexus Is250's considering this light could turn on anytime and if one gets into an accident, then airbag would not deploy resulting in a possible casualty or serious injuries. This should be a recall on all Lexus affected by this. Customer shouldn't be responsible for these workmanship problems.