How to splice cigaret lighter for usb-c charging port?

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I saw this Qi2 phone mount that's available for my 2014 LX 570 vehicle. Since I'm going for a clean OEM type of look/installation, I like to know how convert the cigaret lighter to be a USB charger from the back. So basically I want to splice the cigaret charger to also charge the Qi2 phone mount here. I'd appreciate if anyone can point me to the necessary parts and/or video that shows how this can be done.

charger.webp
 
Hey thats mine haha. I can't guarantee that all years 08-15 have the same cig wiring, I'd assume they do since thats how Toyota rolls. There's only one cig wire on that 4 pin plug that has accessory/switched 12v. That can easily be found via test probe or multimeter. If you're not buying the add-on usb pigtail, you'll need to get a 12v to 5v step down module and a cheap usb plug or an integrated unit like the one available the purchase separately. Posting same photo in case it helps others down the road.

20250503_175542.webp
 

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