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Discussion Starter · #1 ·
But when you already have a carplay adapter box, the full-screen carplay is already working on the original car display. If you need to directly display the reversing interface of the original car on the full-screen display, it is very simple. Find the reversing control cable and extend it to the positive pole of the reversing light in the trunk of the car.
As in the picture below.
Gadget Audio equipment Electrical wiring Computer hardware Cable


Then you can open the trunk and look for the positive side of the reversing light in the trunk.
Automotive tail & brake light Hood Automotive lighting Bag Tartan


Open the trunk and look for the positive side of the reversing light, which is usually one of the plugs inside. If unsure, measure the voltage with a multimeter.
Automotive tire Safety glove Bumper Gas Automotive exterior



Safety glove Wood Automotive tire Gas Thumb


Connect the extended reversing control wire to the positive pole of the reversing light. Then in the full-screen carplay, you can directly switch to the original car reversing interface when reversing starts.
Hand Finger Automotive lighting Hood Automotive tire


 
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