Problem with 2005 Navigation system

I just purchased a used 2005 Prius in the UK. This is my first Prius and I love driving it. However, the satellite navigation system is not working. When I press the Menu or Map buttons, the screen displays "Please insert the correct map disc" with some Japanese characters underneath. I searched the forum and found that other people have had a similar issues and the fix was to reset the ECU by following the procedure detailed here.

However, when I opened up the ECU it only has one circuit board, not two as shown in the procedure. I scoured the circuit board looking for any switches to press - the only one I could find is used to eject the DVD.

The label on the ECU has the following information on it:
86841-50100
EM03A
e13
021446
EJDC008119

Any ideas how to reset it? There is a blue plug with nothing attached - is this some kind of service plug?

 

Yes, that is the first thing I checked

I took the nav unit apart again tonight to see if maybe I missed a reset switch or something else that would give me a clue on how to proceed - no luck. In the hopes that someone will see something that I missed, attached are some pictures of the circuit board.

Appreciate any and all help!

Bryan

 

An update on this issue.

From the diagnostics System Check Mode, the navigation system (NAVI) status shows as NCON. According to the Prius repair manual, this means "The device was previously present, but does not respond in diagnostic mode." The suggested troubleshooting steps are:
1. Check power supply wire harness of the device.
2. Check the AVC−LAN of the device.

The unit is getting power (disc is inserted and ejected by the automatic mechanism, disc spins in unit) so I don't think it is #1. I plan to check #2 tomorrow.

Any other ideas on what might be wrong?

 

Final update on this issue. I ended up taking my Prius into the dealer and they also diagnosed the issue as a bad Navigation ECU. Even though the error message "Please insert the correct map disc" would lead you to believe the problem was with the disc (or the Navigation ECU's ability to read the disc), the more telling clue was the NCON status returned by the System Check Mode. NCON indicates that the Navigation ECU is not communicating on the AVC-LAN.

The cost of a replacement Navigation ECU was over 1645 GBP (~$3,300). Since my car was just 2 months out of warranty, Toyota customer service agreed to reduce the price to 820 GBP (~$1,650). Better, but still highway robbery considering I could have bought 4 Tom Tom GPS units for the same price. I decided to go ahead and replace it so I could have full access to the navigation, phone, and voice recognition capabilities of the car.