Answer
Apr 17, 2025 - 11:39 AM
So as far as I could tell, the 1998 Toyota 4Runner didn’t come with a factory auxiliary input. Those didn’t start showing up until the early 2000s, and even then, usually on higher trims or optional head units. If you’ve still got the original radio, there’s no AUX jack hiding behind a panel or anything — it just wasn’t built with one.
If you’re installing a portable CarPlay unit and want to run audio through your factory system, you’ve got a couple options. Easiest route is to tap into the system using an FM transmitter, which broadcasts audio through a blank FM station. Not perfect, but it works if you’re not picky about sound quality.
Better option is to use a CD changer adapter or an AUX adapter that plugs into the back of the factory radio where the CD changer would connect (if your radio has that port). Brands like GROM or USA Spec make these, and they plug in behind the head unit and give you a 3.5mm AUX or even Bluetooth input.
To access that port or swap the radio entirely, you’ll need to pull the trim around the center dash and unbolt the factory unit. This is a common mod on these trucks, and there are plenty of tutorials on YouTube showing you on how to achieve the best result 😉✌🏻
Good luck!
