Wondering the same. You must buy a PAC or metro Harness pack. And I believe you have to buy the JBL harness and steering wheel harness if you want those to work with the controls in the AMP. I found an Android one on eBay. It likes factory. Just if you have JBL you need the harness and I'm not sound what those head units are compatible with, you'd have to message the seller.

 

I’m pretty clear on the wiring/harness side. I’m asking specifically about the dash kit. The Metra 98-2222 says that it’s not for Highlander factory Nav models and I’m just trying to understand why and whether there’s a way to modify it it in some way to use with the factory nav models.

 

Post a picture of your head unit

 

There is no Metra 98-2222, but there is the 99-8222. The reason why Crutchfield says it doesn't work is because the hazard / ABS / passenger seat belt indicators are built-in to the factory navigation radio. You can still use the 99-8222 kit, but will need to source the separate indicator panel that fits in the lower opening in the kit.

 

Thank you so much for the clarification and the information. This was extremely helpful. Just to ensure I’m looking for the right part, would this be it? It's Toyota Part #840100E050C0

 

Did that actually work for you? I was worried that it might not plug into the connector or plug in but not work properly.

 

Yup, that's the part.