Installing the OEM NAV on a non-NAV equipped Prius

Agree. I installed an ipod interface in my 2002 Corolla and it involved removing the radio and plugging the interface into the CD changer port. The most difficult part was getting the right cables and knowing where to plug them (fortunately the kit included all the cables and instructions).

I wonder if the GPS antenna is shared with something else (eg: satellite radio), as all cars are "pre-wired" for it.

 

Here are more things I discovered after driving the car for a month and interacting with users in this forum:

The dealer will install the NAV but it's not the same as the OEM nav. It's a Toyota unit that fits in a standard double-DIN slot. They are still awaiting the bracket for the 2010 Prius.

There IS information on the TIS site on the harnesses behind each head unit (JBL, non-JBL, NAV, etc). The folks doing the speed sensor mods were able to get info on which pin to tap. Someone close to me is moving to the states so he'll finally be able to sign up for a TIS login for me.

The same speed sensor wire is present in my car. My headunit can sense the speed of my car and adjust the volume automatically. Hopefully the harness that it comes in is the same as the one on a NAV equipped Prius.

There is a voice command button as well as bluetooth call and hangup buttons on the steering wheel (the same set of buttons on a NAV equipped Prius). Hopefully the connectors are the same so I don't have to cut any wires. In addition, the microphone is located near the rearview mirror and is present in all bluetooth equipped cars (NAV or non-NAV).

There is a GPS antenna located under the top dash cover. This needs to be installed and the dash has to be disassembled for this. The GPS antenna must be located very close to the bottom edge of the windshield because the roof of the car affects reception. Therefore alternate locations to install the antenna is out of the question.

The dash is easy to disassemble and reassemble. The people who installed aftermarket subwoofers can testify this.

So the following questions are still pending:

Is the backup camera interface on a Canadian non-NAV Prius the same as a NAV equipped Prius (on Canadian cars, the backup camera display is built into the rearview mirror). I wonder if it's possible to re-route it to the NAV once it's installed.

The same question about the harnesses which I look forward to finding out once I get access to TIS.

 

Definitely getting the original OEM one (provided the harnesses are the same and I don't have to cut too many wires). Just love the look and function of it.

The display on the mirror is very high res (I was pleasantly surprised). So I suspect the resolution is the same. Hopefully the wiring is accessible inside the dash and the harness is the same.

 

Yea, it also has radio and audio controls, since it replaces the original stereo. I'm not sure about steering wheel controls though.

 

I know it won't be as good as my Garmin. But for finding addresses in the city and checking where I am, it's good enough. I also look forward to installing the iPod interface (the new one which includes USB drive support, requires the NAV headunit, and doesn't disable satellite radio). And if that's not enough, I can always bring my Garmin just in case.

 

Other users also suggested this to me. My only concern is the quality. Will it live up to the rest of the car?

I also doubt it will integrate with the touch tracer controls.

From the information other Priuschatters had provided me, and from other posts, it's inside the dash for sure.

If it involves a lot of extra wiring, then I would go aftermarket instead. But so far it looks very easy.

 

My goal is to try to install the OEM headunit first. I'll get the aftermarket unit (I'll most likely go with Kenwood, which is standard double DIN and brackets are avaliable now) if it's technically impossible to install the OEM one.

I should have the information I need soon. Will attempt the install in the next month or so.

rrolff, how long did it take you to open the dash? This is my biggest concern. The OEM GPS antenna is located just under the windshield, to the left of the MFD.

 

Finally got a chance to look through the TIS documents. It is possible to install the OEM NAV but it'll require some extra wiring. There are six harnesses behind the NAV unit, and five behind the non-NAV one (both radios are JBL equipped, BTW). In addition to the missing harness, one harness is different. The harnesses terminate into one or more jumper blocks.

Looks like most of the wiring are within the jumper blocks. I assume it's easy to jumper two points within the same jumper block. But if a connection is between two different jumper blocks, is the wiring already there?

Hopefully an expert who has worked with the wiring can comment on this.


[update] Another interesting tidbit, the backup camera in the Canadian non-NAV Prius (with camera display in the mirror) and the backup camera on the NAV equipped Prius are identical. The harness on the Canadian Prius is different, and has an extra jumper block in between. Electrical connections are the same.

 

Just finished downloading all the relevant documents from TIS (plus the repair manual for my Corolla). Now it's time to digest all the information.

Looks like two harnesses are missing. One (L37) replaces an existing harness (L45) and has a few extra plugs for stuff like the backup camera. The other is completely new (L42) which contains the reverse signal, parking brake status, etc. This one terminates to several junction blocks. So for now I need the following: the two harnesses I mentioned earlier, the GPS antenna, and the NAV itself.

I have a feeling L42 is already in my dash, unused (when I opened the dash of my Corolla, there were a few unused wires, hope the Prius is the same). My next step is to actually open the dash and see what's inside. If L42 is not there, then I need to connect some wires. I know which pins to connect to, but actually how to connect it, that's another thing I have to figure out...

I already have the backup camera from the Canadian premium package, and I as mentioned before, it's identical to the one used with the NAV. I'm planning to leave the camera connected to the mirror and not connect the reverse wire to the NAV (so the backup camera stays with the mirror, and a passenger can enter destinations while I'm backing out of a spot).

Update:

The connectors for the satellite radio are also missing. On the nav equipped Prius, the satellite radio is located under the driver's seat. As a result, on the non-nav (but JBL equipped) Prius, the satellite radio is built into the headunit. Therefore, to install the OEM nav, the OEM satellite radio must also be installed (and I do use the satellite radio).