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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 -.
Need help identifying the type of fuse your aftermarket head unit uses? Compare the fuse included with your aftermarket head unit to the ones shown below.