What is the difference between the 1804, 1805, 1806 and 1807 Scion head units? Is there a web page that has a comparison chart? What model accepts the adapter cable that allow you to control an ipod from the head unit controls?

Thanks in advance

Only the T1806, T1808, and T1809 are iPod compatible.

These require a cable to connect the headunit to the iPod.

The T1804 is the older '04 - '05 single disk one; no knob, just buttons in the middle. Plays MP3s.

The 1805 is the 6-disk version of this 1804, which also has the color changing LCD. The CD player in this unit is know to have problems, especially if shipped incorrectly.

The 1807 is the '05 - '06 base model; single disk unit, knob in the middle, plays MP3s and WMAs, Aux input, no ipod ability.

The 1806 is the upgraded '05 - '06 model; still single disk, two knobs, has the color changing LCD, plays MP3s and WMAs, Aux input, and has ipod controllability.

The 1808 is the current base model. I think it has similar features to the 1806, but it has a new control layout. Also added AAC playback.

The T1809 is the new upgraded radio with multi-color Organic Electro-Luminescent display (OEL) for which you can upload different skins/graphics. I don't know much about it, but I'm pretty sure it'll do everything the T1808 will do as well.

All above models have satellite radio capability.

Then there is the new Alpine Scion Nav System (SNS).

I'm pretty sure I got that all right. Someone correct me if I'm wrong.

Don't think the 1809 has nav, but it does have pre-outs.

Yes, you are correct. I was thinking of the new Alpine Scion Nav System (SNS).

The 1809 has a multi-color LCD for which you can upload different skins/graphics. I'll correct my post.

Here's a pic of the T1809's face:

Thanks for the info guys. Too bad I jumped the gun and bought the wrong unit. Oh well I will install it and enjoy it until the model I want comes up on Ebay.

A couple questions about the install. (2004 model)

Are the panels that house the stereo components held on with clips? Should I just be able to wiggle them and pull them off? Are there any secret screws I need to know about?

Do I have to take off the panels around the gear shift and cup holders before I take off the stereo panels?

Thanks in Advance

http://www.castulucci.com/projects/carpc/oemnaviaccess/

good info, it would help if u had pics.

Here is an 1806 in my 2004 4Runner.
I like this model, because it has the adjustment knobs, not just push-puttons.

are these plug-and-play with an '08 base 4Runner system?

are these plug-and-play with an '08 base 4Runner system?

I have not seen the cable connectors in the 2008 4Runners; so I'm not positive. I would be VERY suprised if it was not Plug-N-Play.

I have seen the head units in the SR5 '08s, and it appears to have the same opening as previous model years.

Everything should work just fine.

You could remove your head unit, take a picture of the back, and post it. Then we will know better.

I'll do that when I take it out...its quite a hassle to remove just to take a pic.

the other thing i've read someplace is that the antenna hookups are different.....any thoughts on that?

The Scion head unit only has one antenna input. There is a piece of metal covering the second input. When I installed my Scion radio, I cut off the small piece of metal, and was able to plug both antenna cable into the head unit. Both 4Runner antenna cables do plug into the Scion head unit.

However, this does not improve reception, since the Scion head unit does not use the second antenna input. It is a dead end, inside the box. This means that radio reception is slightly better with the original head unit. But it also means that your 2nd antenna cable is not loose behind the dash.

BUT: AM or FM sound quality isn't as good as CD or MP3 or iPod anyway. In my mind, it was no great loss. We still listen to FM around town, with no problems.

did you splice the antenna amp power into a live power wire? From what I read, you need power to the antenna amp for it to actually be doing anything.

how is your AM reception? All the best sports stations in this area are AM.....