I have 3 of them with lights. The missus has a few of lights out in her i30 (two brake and a head light) never changed car globes previously as they have always conveniently blown around service time. From memory, the airbag processor sends a low current signal through each device as a failsafe.
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With a 3 in 1 which uses a remote, and easy access in a pitched roof for the line to.
They are easier to use with the phone app than the remote that comes with them.
Those above cooking healthy & excersizing are clearly amazing people, but i'm not sure calling people who turn to lite n' easy lazy is being very understanding. Easy diy job should be plugged into 240v socket so you simply pull out d/l then tranny and unplug from plug and plug in new one and bobs ya uncle (make sure you buy d/l's. I did lite 'n easy for dinners only for a while last year. I went with the mercator ikuu ceiling fans.
So i assume a wire. It would be easy enough to test that though, because the wire to each of the bars just plugs into the bar, so you could test the bars one or two at a time by unplugging the other. And that depends on the detail of the house, how easy it is to run a line to the new switch etc. The airbag warning light is coming on in my vt.