The image below shows the tip/sleeve wiring of the Tombit 3rd-Gen Toyota Tacoma mic adapter’s 3.5mm mic cable. The preponderance of aftermarket head units use this convention where the tip of the jack is wired to the Mic + and the sleeve of the jack is wired to the Mic -.
![](https://tombit.com/wp-content/uploads/2021/11/3.5mm-TS-Mono-Cable-Wiring.png)