Battery and immobilizer
 

So I'm getting the seats redone. Should I put my ctek on battery? will this be ok? Or should I disconnect the battery before removing seats? I heard that I should not put key in ignition when seats are out or dreaded airbag light will come on and will have to get it reset. So wondering if the ctek is ok to keep battery charged.

So I'm also going to take out the immobilzer and add the ecu doctor waterproof box. Any tips? I saw install video and looks easy.

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I always disconnect the battery before doing anything electrical like unplugging the seats, the ECU box instructions also tell you disconnect the battery. I wouldn't worry about the battery dying if it is unplugged for a week or two, but you could always disconnect the battery and connect the ctek directly to it.