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.
How to splice cigaret lighter for usb-c charging port? (1 Viewer)
- Thread starter Charlielj
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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.
3.4A Fast Charging Compatible USB-A Pigtails (single Unit) - Etsy
This Car Accessories item is sold by YotaForge3D. Ships from Orem, UT. Listed on Sep 4, 2025
www.etsy.com
- Thread starter
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Is this the splice pigtail I will need to split the cigaret behind the dash so I can power the mount charger?3.4A Fast Charging Compatible USB-A Pigtails (single Unit) - Etsy
This Car Accessories item is sold by YotaForge3D. Ships from Orem, UT. Listed on Sep 4, 2025
Correct. Comes with bare power and ground ready to splice into. It converts from 12v to 5v as needed.
bloc
SILVER Star
I tried wiring up a magsafe puck with a pretty basic 12v to USBC adapter on the cig lighter circuit and it turns out it didn’t make enough power to actually charge the phone. I believe the inductive nature of the magnetic chargers means they are less efficient and you need to throw a lot of power at it.
I ended up getting a high power usbc cigarette lighter adapter then spliced in a cig lighter socket for the adapter to live in behind the dash. Copious tape to keep it from backing out.. it has worked well for a couple years now.
I ended up getting a high power usbc cigarette lighter adapter then spliced in a cig lighter socket for the adapter to live in behind the dash. Copious tape to keep it from backing out.. it has worked well for a couple years now.
It must depend on what the converter is rated for. The ones I use charge phones great with the qi2 magsafe chargers, even while using android auto/carplay.
There's actually lots of layers at work and it's easy to get wrong. Factors include the USB physical interface, power spec, power delivery protocol, policy engine, magsafe physical compatibility including case, magsafe spec, charging protocol, temp compensation, etc. The newer phones and magsafe implementations should be able to deliver enough power to both charge and use at the same time, but again, depends on everything ahead of it properly being supported.
To the OP, some of the newer USB specs can deliver over 100W of power. I'm not sure I would splice the small gauge wire and circuit meant for only 1 cigarette lighter at 10A.
I recommend using an add-a-circuit from the fuse boxes in the footwells. Driver footwell if you want ignition on power, or passenger footwell for constant power.
I wouldn't bother with USB-A any longer. It's not capable of the newer Power Delivery (PD) specs associated with USB-C that every modern device now uses.
bloc
SILVER Star
Yeah, the first adapter was most likely not PD, only selected to make wiring all of this easier, but the second was. Name brand 30W on the second, IIRC. The first would charge the phone via cable but on magsafe wouldn’t show charging at all. You’re correct, there could have been a bunch of reasons for this.
And I totally agree on USB-A. There’s just no point to it anymore.
