Looking to buy a 2009 Alphard but I want to be about to install a English head unit and have all the OEM features. The 2009 I'm looking at has the 270 camera and 4 speakers in the headliner. Which Oem stereo system is it equipped with? Amplified? From the pictures I seen of the interior there are only 4 speakers in the headliner maybe a 5th.

Will it be simple headunit swap or will I need a canbus box and wiring diagrams and splicing of wires to get a head unit to work?

The confusion arises because some imports are actually 'export' models from Hong Kong.

Are you sure it's just 4 in rooflining? If it's the 18 speaker system, there are 6 in the roof, 2 in rear and 4 between the two sunroofs ( these 4 near the front can have split audio sources, eg, radio/bluetooth for the front passenger and driver, and the rear 4 roof speakers outputting cd/dvd for the rear passengers.

The base model has 8 speakers, the super live has 11 speakers and the premium has 18 speakers.

The 11 spk has an amplifier under passenger seat.

The 18 spk has a larger amplifier under passenger seat and a subwoofer under drivers seat.

The 270degree camera has an IPA (intelligent parking assist) ECU under passenger seat, that takes inputs from the sonar, and the additional two side sensors on the front bumper.

The front and side cameras connect via this ecu.

can you see if tweeters are fitted on the sliding doors? They are located near on the front trim of the windows.

In any case, your headunit model suggests an external amplifier.

You can buy an adapter that converts an analogue output signal from an aftermarket headunit into a digital signal the amplifier understands., and therefore retain the amplifier and existing speaker wiring.

I can share the block diagrams and wiring schematic for the ipa and headunit

Pretty sure there's only 4 speakers in the roof. No sunroof on this vehicle. Vehicle is currently in Yokohama Japan. There looks to be tweeters in the sliding door. So this is the super live system I assume.

Hard to see as I only have pictures from the selling website.

Thanks

Yes. Some of the non sunroof utilise a different design speaker in the roof.

This must be an 18 speaker system.

The amplifier is a 16 channel 480watt system, and a separate active powered subwoofer.