GR Yaris Facelift Yaris Headunit Retrofit - Is it possible?

[GR17]

Looks so promising, I wonder if there is a way to make it work.

 

[GRavy_Baby]

It fits physically, just as expected. The wiring, though... not even close.

The sensible thing would be to return it and call it a no-fit.
But I'm kind of hooked on it now. Damn it!

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[Kaxe]

LOL you went LARGER!?
Most people doing these wanted it less encroaching on the windscreen lol!
Looking at it, I guess it's just going to block your vents a little...
Good luck!

 

[tonic]

LOL you went LARGER!?
Most people doing these wanted it less encroaching on the windscreen lol!
Looking at it, I guess it's just going to block your vents a little...
Good luck!

Thanks

My seat is lowered by 30mm, and I've never had issues with the head unit obstructing the windshield.
The new head unit sits about 4mm higher, but there's still ~15mm gap to the bottom edge of the windshield.

 

[tonic]

Here's an update.

After spending way too much time digging through Toyota Tech manuals, Amayama catalogues, and Ovoko listings, I think I'm finally on the home stretch of piecing together the 10.5" head unit puzzle.

The issue is that this head unit is much more common in the Yaris Cross than the regular Yaris. As a result, used Yaris Cross parts are easy to find, while Yaris parts are pretty rare. Some components are identical but have different part numbers, while others are completely different because the lower dashboard design isn't the same. Buying everything new from Toyota would be the easy option, but it would push the cost well beyond what makes sense for this project.

Here's what's needed to fit the 10.5" unit into a Gen1 GRY.

Parts shared between Yaris and Yaris Cross:

• 10.5" head unit – 86140-0D721. There are different versions for various markets and the premium 8-speaker system, but this one appears to match the GRY CP audio setup.
• Head unit trim – 55420-0D041. There are a few variations, but most should fit.
  
  
  
  
  
• Air vents – 55670-0D660 (also listed as 0C5652D650, 0C5641D650, 0C5642D650).
  
  
  
  
  
• Center air duct – 55086-0D050.
  
  

Yaris-specific:

• Lower dashboard trim – 55435-0D290(-C0). This has the wider opening for the larger vents.
  
  
  
  
  
• Locating bracket (replaces the storage tray under the vents) – 55445-0D220. I had to order this from Toyota since the Yaris Cross version doesn't fit. Still waiting for it.
  
  

One annoying discovery is that Yaris and Yaris Cross models with the 10.5" unit actually use slightly different dashboards. The updated dashboard has a cutout where the center tray mounting points are. On the stock GRY dashboard, the new air duct and center vents interfere with that area.

The options are:

• Replace the whole dashboard panel (expensive and a lot of work).
• Trim the interfering section (works, but there's no going back as the original tray loses its main mounting points).
• Design and 3D print a custom air duct that connects the original GRY duct to the new center vents. That's the option I'm leaning towards.

I also finished mapping the wiring. As mentioned before, it's quite different. The wire colors match quite well in most places, but not everywhere, and the pinout is different. An adapter harness will definitely be needed. I'll post the full wiring diagram once I've confirmed everything works.

The GPS, FM, and DAB antenna connectors are different too, so it looks like part of the antenna loom and the GPS module under the dash will need to be swapped. The original antenna wiring uses larger connectors, so they're not directly compatible.

The USB connector is another difference. It can be cut and wired to the GRY one, but the 10.5" unit uses USB-C and I want a proper USB-C PD charging. The USB-C modules from the Yaris and Yaris Cross have a different shape and won't fit the GRY.

However, it looks like the Corolla Cross uses one that should fit the GRY location. I've got one on the way, so I'll know soon enough.

That's where things stand for now. I'll post another update once the remaining parts arrive and I can start putting everything together.

 

[GR17]

I wonder if the 3d printed air duct could be made to be slim enough so that you still have that underscreen tray?

 

[tonic]

I wonder if the 3d printed air duct could be made to be slim enough so that you still have that underscreen tray?

I'd like to keep the original tray, but there's really no way to do that with the new vents since they take up the entire space where the tray sits. The part I'm working on is an adapter that connects the new vents to the black plastic duct coming from the HVAC unit. I've already modeled the connecting parts (red and light blue) for the new vents and the original duct. Now I need to connect those together into a single part.