Chris.ac

so you have a GGH25?

I PMed you a link to my google share, with the wiring diagram and manuals

Steering control is socket D pins 23,24,25)

I don't want to get struck with a copyrght complaint, so have complied with sharing less than 20% - this shows the socket letters and pin numbers. Interestingly, should be able to use the inbuilt microphone, with some careful testing (socket D pins 4,5,6,7,20)

it should do, the cameras will be on the blue connector in car, the box converts the video to regular phono lead, so it should show what you would ordinarily see - Not sure if it is interactive though, as I dont see how it will communicate back the other way. the steering control is 3 wires on the main power plug, so this should be fine too

the brown socket on that head unit is used by the rear screen for the digitally superimposed info, such as volumn, icons, etc. The blue is for the intelligent parking assist ecu connection (It feeds in the front and side cameras) the 1st 2 connectors are both for the TV antennas, one at front of car and one at back (in spoiler) the 3rd connector on the 2nd row is telematics (GBOOK, toyota connect, emergency services - it actually has a usb protocol, so would be interesting if we can reuse this for some other purpose) the 4th socket is the aux video/audio input. the large socket on the bottom right is actually 2 sockets in one, the 8 pins on the left are the Amplifier connection.

Yes, that convertor would work (MOST is the communications protocol for the amplifier etc, there is a fair amount of crossover between 2004>2012 between LIN, MOST and the video protocol using GVIF and LVDS)

Yes, I now have the wiring diagrams for 2008>2010 for the JDM version of the alphard, all the right sockets and wiring for the headunit

i have a newer vehicle, so not sure if the same, the drainage holes seem to exit in the body work seam, just in front of the jacking point, mine was so blocked, no amount of feeding a wire down would clear it, in the end I blew it through with a tyre inflater! For me, the roof lining around the front sunroof is held with velcro fastening, but in the end, I dropped the front side of the roof lining by removing the side window trim (a pillar) and the B pillar trims, removed the grab handles and sunvisor. undid the clip holding hose on(front corners of the front sunroof), the moon roof has drains on all 4 corners, the front 2 actually just pass water to the front sunroof channel.

setting aside the argument about mpg or power, in Japan, the 2 fuel grades are 91 and 98, arguably, this is the reason they use the premium fuel as recommended, whereas in the UK regular is often 95RON. Just spare a thought for our USA cousins, their RON values are barely in the 90s

It depends on what head unit you already have installed, i chose this one because i wanted the touchscreen to work a the controller. THe principle is mostly the same on all units though, and there are various places on aliexpress selling similar units

Took me about 2hours, but this was to discover the wires needed, some routing of wires and trying different ways to route the flexi connector to the screen. I bought this: https://a.aliexpress.com/_mPcGuRy

just checked, was £62 for the cd, and £31 for taxes and shipping (I used ZenMarket for this transaction, Ive used Jauce for full 10 piece interior window covers and valanti rear fogs)

Jauce and zenmarket are perfectly legit, I have had no issue so far, except for the import costs which are shocking. I think the cdrom i ordered was about £20 to ship

Yes its worth buying newer model, next gen hybrid engine, more gear ratios on the 2.4lt engine gearbox, better regenerative braking. That and the older vehicles are packing battery cells that are several years older. Its not just the hybrid system, its age related wear on all the components like rubbers etc, regardless of mileage, entropy is a bugger.

When you say upgrade, do you mean getting carplay/android auto added, or a full replacement? I still for the most part BT connect my phone and use android apps like tunein radio to provide radio streams. The upgrade unit that some dealers are selling works fine, I did a self installation, so it only cost around £180, instead of the £350ish being bandied about. for the price, I can use the headunit screen to display waze/sygic, I have some audio apps, and mirroring seems to work perfectly fine, the good thing is, switch away from aux input, and everything else on head unit works as standard, even the cameras cut in when they are supposed to.

The overlay is generated by the ecu, with steering wheel position/angle, and sonar data. the actual video from the camera should be analogue, if you do not have the 4 wire connector, then you must have the loom that places the signal on one of the power connectors. Its a shame i didnt save all the 10 series wiring whilst the russian mirror was live, and i cant justify the £60 odd for the japanese maintenance cdrom

Should ask - do you have auto parking or the 3 camera setup?

no, that is a GVIF connector, it is used to transmit video digitally - often used in conjunction with overlay data - so this blue connector connects to the parking assist ecu, where it can combine video inputs and overlay, such as reverse lines, front side view angles, graphics for auto parking and sonar and the front/side camera images. The rear camera should exist on one of the other connectors, but I can only advise on the 20 series.

2 is parking assist system 3 GPS antenna 6 Telemetric system (G-Book, Toyota assist) 7 not used on mine, not sure what this is 8 I think is external DVD/CD multichanger 13 is TV/DBT & antenna Somewhere in the other connectors, you'd have Aux in (which you have already discovered) Electronic Toll Collection system, speakers etc, rear screen connection etc

i think the pink stripped wire is reverse signal, too, if you need it.

This may be compatible, and in stock: https://www.amazon.co.jp/-/en/Navigation-nszt-–-Y66T-Nscd-–-W66-Genuine-terebi・nabi/dp/B01N30PMGN