spaziwk — I'm attaching the TCH's Overall Electrical Wiring Diagram from the Repair Manual. Document pages 418-419 cover the NAV system, while pages 420-421 cover the non-NAV. As you can see, the main difference is that there's a SPD (speed) signal from the Combination Meter to the NAV radio, and also the CAN bus signals. But the connector pin-out isn't the same — note that there's a different power supply arrangement, taking power from the IG (ignition) ECU power line. So, some additional wiring will be needed, and some connector pins will have to be rearranged/removed.

Stan

 

"Whew. My factory installed NAV was a bargain"

I agree, 100%

 

You are not quite correct.

All the Camry NAV units are the same, whether they are from TCH or non-hybrid.

However, the input into the NAV unit is different, as SPL has so kindly posted. Nobody has been able to figure out what are the necessary wires that need to be added or pinned-out from a factory non-NAV Camry in order to send the energy monitor info to the NAV unit. Basically, somebody needs to dissect side-by-side a non-NAV TCH and a NAV-equipped TCH. Nobody with factory NAV has been willing to donate their car to OEM-Value for this experiment (with good reason!)

 

Factory installation of OEM parts is usually going to be much cheaper than aftermarket installation of the same OEM part. However, I could do an aftermarket NAV installation for the same price as your factory unit, and it would have much better functionality (i.e. DVD playback), such as the Pioneer AVIC Z1. Of course, any aftermarket install (even of an OEM part) will not be covered under factory service warranty, so sometimes it's better to go with factory.

 

Thanks for the info. That's actually good that the Nav Units are the same. At least it has the capability. Perhaps Toyota will come out with an upgrade kit/wiring harness someday.

I considered an Aftermarket NAV but I absolutely love the Camry's Bluetooth and didn't want to give it up! Even without the Energy Monitoring working I am quite happy with it.

 

spaziwk — Further to my Post #61, it would be a very challenging job to make a NAV radio display hybrid-specific information unless it's been factory installed. Further perusal of the Wiring Diagrams that I posted shows that the NAV version has 5 connectors, whereas the non-NAV radio uses only 3. Moreover, only one of these connectors uses the same wiring arrangement as the non-NAV radio. Some of the wires would need to be distributed amongst the new connectors. I suppose an adapter cable harness could be made that would take the 3 plugs from the non-NAV car, and have the wires routed to 5 new plugs that would go to the NAV radio. There are, however, 5 additional wires that are needed beyond those already present in the non-NAV vehicle's wiring harness:
(a) CANH and CANL — the two CAN bus lines
(b) IG — 12-V power from the ignition circuit
(c) SPD — the speed signal from the Combination Meter
(d) REV — a signal from the backup light relay (I wonder what this is needed for?)
Good luck if you attempt this conversion! Let us know if you're successful.

Stan

 

For the NAV's "dead reckoning" function to work (where GPS signal is temporartily unavailable) the NAV would need to know direction (forward or reverse) in addition to speed (by counting pulses). There is also an inertial device somewhere (probably tied to the stability control) that helps the nav keep track of the direction of travel during dead reckoning. So with speed, direction information the NAV does a darn good job of keeping track of its location even without a GPS signal. Good for indoor parking lots, heavily forested areas and urban canyons.

 

Of that is used to trigger the backup cam image since it only works in reverse from my understanding??

 

Since when did Toyota start offering a backup camera as a factory installed option on the Camry?

 

They don't but if I remember correctly the after market backup cam is only activated (shown) on the NAV screen when in reverse so it must be controlled by something. But who knows, maybe I read the DIY wrong.

If it was shown all the time and the drive just needed to flip a switch then we could set up a DVD player quite easily but I read it as it is only shown while in reverse.